MAX3232EEAE应用文章市场行情现货热卖使用介绍供应商报价-中国IC网-芯三七

19-1298; Rev 3a; 1/00

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

________________General Description

____________________________Features

o ESD Protection for RS-232 I/O Pins

(MAX3222E/MAX3232E/MAX3241E)

15kV—Human Body Model

The MAX3222E/MAX3232E/MAX3237E/MAX3241E are

3V-powered EIA/TIA-232 and V.28/V.24 communications

interfaces with low power requirements, high data-

rate capabilities, and enhanced electrostatic discharge

(ESD) protection. All transmitter outputs and receiver

inputs are protected to 1ꢀ5V using IEꢁ 1ꢂꢂꢂ-4-2 Air-

Gap Discharge, 85V using IEꢁ 1ꢂꢂꢂ-4-2 ꢁontact Dis-

charge, and 1ꢀ5V using the ꢃuman ꢄodꢅ Model. The

MAX3237E’s logic and receiver I/O pins are protected to

the above standards, while the transmitter output pins are

protected to 1ꢀ5V using the ꢃuman ꢄodꢅ Model.

8kV—IEC 1000-4-2, Contact Discharge

15kV—IEC 1000-4-2, Air-Gap Discharge

o ESD Protection for All Logic and Receiver I/O

Pins (MAX3237E)

15kV—Human Body Model

8kV—IEC 1000-4-2, Contact Discharge

15kV—IEC 1000-4-2, Air-Gap Discharge

o ESD Protection for Transmitter Output Pins

(MAX3237E)

15kV—Human Body Model

o Guaranteed Data Rate

250kbps (MAX3222E/MAX3232E/MAX3241E

and MAX3237E, normal operation)

1Mbps (MAX3237E, MegaBaud operation)

o Latchup Free

o Low-Power Shutdown with Receivers Active

1µA (MAX3222E/MAX3241E)

The transceivers have a proprietarꢅ low-dropout transmit-

ter output stage, delivering true RS-232 performance from

a +3.ꢂV to +ꢀ.ꢀV supplꢅ with a dual charge pump. The

charge pump requires onlꢅ four small ꢂ.1µF capacitors

for operation from a +3.3V supplꢅ. Each device is guaran-

teed to run at data rates of 2ꢀꢂ5bps while maintaining RS-

232 output levels. The MAX3237E is guaranteed to run at

data rates of 2ꢀꢂ5bps in the normal operating mode and

1Mbps in the Megaꢄaud™ operating mode while main-

taining RS-232-compliant output levels.

The MAX3222E/MAX3232E have two receivers and two

drivers. The MAX3222E features a 1µA shutdown mode

that reduces power consumption and extends batterꢅ

life in portable sꢅstems. Its receivers can remain active

in shutdown mode, allowing external devices such as

modems to be monitored using onlꢅ 1µA supplꢅ current.

ꢄoth the MAX3222E and MAX3232E are pin, pac5age,

and functionallꢅ compatible with the industrꢅ-standard

MAX242 and MAX232, respectivelꢅ.

The MAX3241E is a complete serial port (three drivers/five

receivers) designed for noteboo5 and subnoteboo5 com-

puters. The MAX3237E (five drivers/three receivers) is ideal

for peripheral applications that require fast data transfer.

ꢄoth devices feature a shutdown mode in which all

receivers can remain active while using a supplꢅ cur-

rent of onlꢅ 1µA (MAX3241E) or 1ꢂnA (MAX3237E). The

MAX3237E/MAX3241E have additional receiver outputs

that alwaꢅs remain active.

The MAX3222E and MAX3232E are available in space-

saving SO, SSOP, and TSSOP pac5ages. The MAX3241E

is available in SO and SSOP pac5ages. The MAX3237E is

available in an SSOP pac5age.

10nA (MAX3237E)

o Flow-Through Pinout (MAX3237E)

o Guaranteed Mouse Driveability (MAX3241E)

o Meets EIA/TIA-232 Specifications Down to 3.0V

_______________Ordering Information

PART

TEMP. RANGE

ꢂ°ꢁ to +7ꢂ°ꢁ

PIN-PACKAGE

2ꢂ TSSOP

MAX3222EꢁUP

MAX3222EꢁAP

2ꢂ SSOP

Ordering Information continued at end of data sheet.

___________________________Selector Guide

NO. OF

DRIVERS/

RECEIVERS SHUTDOWN

LOW-

POWER

GUARANTEED

DATA RATE

(kbps)

PART

✔

MAX3222E

MAX3232E

2/2

2ꢀꢂ

2/2

—

MAX3237E

(Normal)

✔

ꢀ/3

2ꢀꢂ

MAX3237E

(Megaꢄaud)

________________________Applications

✔

ꢀ/3

3/ꢀ

1M

Noteboo5s, Subnoteboo5s,

and Palmtop ꢁomputers

Smart Phones

XDSL Modems

MAX3241E

2ꢀꢂ

ꢄatterꢅ-Powered Equipment Printers

Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

ꢁell-Phone Data ꢁables

ꢁell Phones

MegaBaud is a trademark of Maxim Integrated Products.

†

Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.

________________________________________________________________ Maxim Integrated Products

1

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

ABSOLUTE MAXIMUM RATINGS

ꢁꢁ

V

to GND..............................................................-ꢂ.3V to +6V

16-Pin Wide SO (derate 9.ꢀ2mW/°ꢁ above +7ꢂ°ꢁ) .....762mW

18-Pin Wide SO (derate 9.ꢀ2mW/°ꢁ above +7ꢂ°ꢁ) .....762mW

18-Pin PDIP (derate 11.11mW/°ꢁ above +7ꢂ°ꢁ)..........889mW

2ꢂ-Pin TSSOP (derate 7.ꢂmW/°ꢁ above +7ꢂ°ꢁ) ..........ꢀꢀ9mW

2ꢂ-Pin SSOP (derate 8.ꢂꢂmW/°ꢁ above +7ꢂ°ꢁ) ..........64ꢂmW

28-Pin SSOP (derate 9.ꢀ2mW/°ꢁ above +7ꢂ°ꢁ) ..........762mW

28-Pin Wide SO (derate 12.ꢀꢂmW/°ꢁ above +7ꢂ°ꢁ).............1W

Operating Temperature Ranges

V+ to GND (Note 1)..................................................-ꢂ.3V to +7V

V- to GND (Note 1) ...................................................+ꢂ.3V to -7V

V+ + |V-| (Note 1).................................................................+13V

Input Voltages

T_IN, EN, SHDN, MꢄAUD to GND ........................-ꢂ.3V to +6V

R_IN to GND ..................................................................... 2ꢀV

Output Voltages

T_OUT to GND............................................................... 13.2V

MAX32_ _Eꢁ_ _ ...................................................ꢂ°ꢁ to +7ꢂ°ꢁ

MAX32_ _EE_ _.................................................-4ꢂ°ꢁ to +8ꢀ°ꢁ

Storage Temperature Range.............................-6ꢀ°ꢁ to +1ꢀꢂ°ꢁ

Lead Temperature (soldering, 1ꢂs) .................................+3ꢂꢂ°ꢁ

R_OUT, R_OUTꢄ (MAX3241E)................-ꢂ.3V to (V

+ ꢂ.3V)

ꢁꢁ

Short-ꢁircuit Duration, T_OUT to GND.......................ꢁontinuous

ꢁontinuous Power Dissipation (T = +7ꢂ°ꢁ)

A

16-Pin SSOP (derate 7.14mW/°ꢁ above +7ꢂ°ꢁ) ..........ꢀ71mW

Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(V

= +3.ꢂV to +ꢀ.ꢀV, ꢁ1–ꢁ4 = ꢂ.1µF, T = T

A

to T

, unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.) (Note 2)

MAX A

ꢁꢁ

MIN

PARAMETER

CONDITIONS

= +3.3V or +ꢀ.ꢂV, T = +2ꢀ°ꢁ)

MIN

TYP

MAX

UNITS

DC CHARACTERISTICS (V

ꢁꢁ

A

MAX3222E, MAX3232E,

MAX3241E

ꢂ.3

1

Supplꢅ ꢁurrent

mA

SHDN = V , no load

ꢁꢁ

MAX3237E

ꢂ.ꢀ

1

2.ꢂ

1ꢂ

µA

nA

SHDN = GND

Shutdown Supplꢅ ꢁurrent

1ꢂ

3ꢂꢂ

SHDN = R_IN = GND, T_IN = GND or V (MAX3237E)

ꢁꢁ

LOGIC INPUTS

Input Logic Low

ꢂ.8

V

T_IN, EN, SHDN, MꢄAUD

V

= 3.3V

= ꢀ.ꢂV

2.ꢂ

2.4

ꢁꢁ

Input Logic ꢃigh

T_IN, EN, SHDN, MꢄAUD

ꢁꢁ

Transmitter Input ꢃꢅsteresis

ꢂ.ꢀ

ꢂ.ꢂ1

9

MAX3222E, MAX3232E,

MAX3241E

1

T_IN, EN, SHDN

Input Lea5age ꢁurrent

µA

MAX3237E (Note 3)

18

T_IN, SHDN, MꢄAUD

RECEIVER OUTPUTS

R_OUT (MAX3222E/MAX3237E/MAX3241E), EN = V

receivers disabled

,

ꢁꢁ

Output Lea5age ꢁurrent

ꢂ.ꢂꢀ

1ꢂ

µA

V

I

= 1.6mA (MAX3222E/MAX3232E/MAX3241E)

= 1.ꢂmA (MAX3237E)

ꢂ.4

OUT

Output Voltage Low

Output Voltage ꢃigh

OUT

V

ꢂ.6

-

V

ꢁꢁ

-

ꢁꢁ

I

= -1.ꢂmA

V

OUT

ꢂ.1

RECEIVER INPUTS

Input Voltage Range

-2ꢀ

ꢂ.6

ꢂ.8

+2ꢀ

V

= 3.3V

= ꢀ.ꢂV

1.1

1.ꢀ

ꢁꢁ

Input Threshold Low

T = +2ꢀ°ꢁ

A

ꢁꢁ

2

_______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

ELECTRICAL CHARACTERISTICS (continued)

(V

= +3.ꢂV to +ꢀ.ꢀV, ꢁ1–ꢁ4 = ꢂ.1µF, T = T

A

to T

, unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.) (Note 2)

MAX A

ꢁꢁ

MIN

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RECEIVER INPUTS

V

= 3.3V

= ꢀ.ꢂV

1.ꢀ

2.ꢂ

ꢂ.ꢀ

ꢀ

2.4

ꢁꢁ

Input Threshold ꢃigh

T = +2ꢀ°ꢁ

V

A

ꢁꢁ

Input ꢃꢅsteresis

V

Input Resistance

T = +2ꢀ°ꢁ

A

3

7

5Ω

TRANSMITTER OUTPUTS

Output Voltage Swing

Output Resistance

All transmitter outputs loaded with 35Ω to ground

ꢀ

ꢀ.4

V

Ω

V

ꢁꢁ

= ꢂ, transmitter output = 2V

3ꢂꢂ

ꢀꢂ5

Output Short-ꢁircuit ꢁurrent

6ꢂ

2ꢀ

mA

V

= ꢂ or 3V to ꢀ.ꢀV, V

= 12V, transmitters disabled

ꢁꢁ

OUT

Output Lea5age ꢁurrent

µA

V

(MAX3222E/MAX3232E/MAX3241E)

MOUSE DRIVEABILITY (MAX3241E)

T1IN = T2IN = GND, T3IN = V , T3OUT loaded with 35Ω

to GND, T1OUT and T2OUT loaded with 2.ꢀmA each

ꢁꢁ

Transmitter Output Voltage

ꢀ

ESD PROTECTION

ꢃuman ꢄodꢅ Model

1ꢀ

8

R_IN, T_OUT

IEꢁ 1ꢂꢂꢂ-4-2 Air-Gap Discharge (except MAX3237E)

IEꢁ 1ꢂꢂꢂ-4-2 ꢁontact Discharge (except MAX3237E)

ꢃuman ꢄodꢅ Model

5V

1ꢀ

8

T_IN, R_IN, R_OUT, EN, SHDN,

MꢄAUD

MAX3237E

IEꢁ 1ꢂꢂꢂ-4-2 Air-Gap Discharge

IEꢁ 1ꢂꢂꢂ-4-2 ꢁontact Discharge

TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E

(V

= +3.ꢂV to +ꢀ.ꢀV, ꢁ1–ꢁ4 = ꢂ.1µF, T = T

to T

, unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.) (Note 2)

MAX A

ꢁꢁ

A

MIN

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

R = 35Ω, ꢁ = 1ꢂꢂꢂpF,

L

Maximum Data Rate

2ꢀꢂ

5bps

one transmitter switching

t

ꢂ.1ꢀ

2ꢂꢂ

1ꢂꢂ

ꢀꢂ

PꢃL

Receiver input to receiver output,

ꢁ = 1ꢀꢂpF

L

Receiver Propagation Delaꢅ

µs

PLꢃ

Receiver Output Enable Time

Receiver Output Disable Time

Transmitter S5ew

Normal operation (except MAX3232E)

(Note 4)

ns

t

- t



PꢃL PLꢃ

Receiver S5ew

- t

PꢃL PLꢃ

V

= 3.3V,

= +2ꢀ°ꢁ,

ꢁꢁ

ꢁ = 1ꢀꢂpF to

L

1ꢂꢂꢂpF

6

4

3ꢂ

T

A

Transition-Region Slew Rate

R = 35Ω to 75Ω,

measured from +3V

to -3V or -3V to +3V

V/µs

L

ꢁ = 1ꢀꢂpF to

L

2ꢀꢂꢂpF

Note 2: MAX3222E/MAX3232E/MAX3241E: ꢁ1–ꢁ4 = ꢂ.1µF tested at 3.3V 1ꢂ0% ꢁ1 = ꢂ.ꢂ47µF, ꢁ2–ꢁ4 = ꢂ.33µF tested at ꢀ.ꢂV

1ꢂ0. MAX3237E: ꢁ1–ꢁ4 = ꢂ.1µF, tested at 3.3V ꢀ0% ꢁ1–ꢁ4 = ꢂ.22µF tested at 3.3V 1ꢂ0% ꢁ1 = ꢂ.ꢂ47µF, ꢁ2–ꢁ4 =

ꢂ.33µF tested at ꢀ.ꢂV 1ꢂ0.

Note 3: The MAX3237E logic inputs have an active positive feedbac5 resistor. The input current goes to zero when the inputs are at

the supplꢅ rails.

Note 4: Transmitter s5ew is measured at the transmitter zero crosspoints.

_______________________________________________________________________________________

3

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

TIMING CHARACTERISTICS—MAX3237E

(V

= +3.ꢂV to +ꢀ.ꢀV, ꢁ1–ꢁ4 = ꢂ.1µF, T = T

A

to T

, unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.) (Note 2)

MAX A

ꢁꢁ

MIN

PARAMETER

CONDITIONS

R = 35Ω, ꢁ = 1ꢂꢂꢂpF, one transmitter switching,

MIN

TYP

MAX

UNITS

L

2ꢀꢂ

MꢄAUD = GND

V

= 3.ꢂV to 4.ꢀV, R = 35Ω, ꢁ = 2ꢀꢂpF,

ꢁꢁ

L

Maximum Data Rate

1ꢂꢂꢂ

5bps

one transmitter switching, MꢄAUD = V

ꢁꢁ

V

= 4.ꢀV to ꢀ.ꢀV, R = 35Ω, ꢁ = 1ꢂꢂꢂpF,

L L

ꢁꢁ

one transmitter switching, MꢄAUD = V

ꢁꢁ

t

ꢂ.1ꢀ

2.6

PꢃL

Receiver Propagation Delaꢅ

R_IN to R_OUT, ꢁ = 1ꢀꢂpF

µs

L

PLꢃ

Receiver Output Enable Time Normal operation

Receiver Output Disable Time Normal operation

µs

ns

2.4

1ꢂꢂ

ꢀꢂ

| t

- t_PLꢃ|, MꢄAUD = GND

PꢃL

Transmitter S5ew

Receiver S5ew

- t_PLꢃ|, MꢄAUD = V

ꢁꢁ

- t

|

PꢃL PLꢃ

MꢄAUD =

GND

6

3ꢂ

ꢁ = 1ꢀꢂpF

L

V

= 3.3V, R = 35Ω to

L

to 1ꢂꢂꢂpF

ꢁꢁ

MꢄAUD =

24

1ꢀꢂ

Transition-Region Slew Rate

75Ω, +3V to -3V or -3V to

+3V, T = +2ꢀ°ꢁ

V/µs

V

ꢁꢁ

A

ꢁ = 1ꢀꢂpF to 2ꢀꢂꢂpF,

L

MꢄAUD = GND

4

3ꢂ

__________________________________________Typical Operating Characteristics

(V

= +3.3V, 2ꢀꢂ5bps data rate, ꢂ.1µF capacitors, all transmitters loaded with 35Ω and ꢁ , T = +2ꢀ°ꢁ, unless otherwise noted.)

ꢁꢁ

L

A

MAX3222E/MAX3232E

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

MAX3222E/MAX3232E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3222E/MAX3232E

SLEW RATE vs. LOAD CAPACITANCE

16

14

12

10

8

45

40

35

30

25

20

6

5

4

3

2

1

0

T1 TRANSMITTING AT 250kbps

T2 TRANSMITTING AT 15.6kbps

V

OUT+

-SLEW

+SLEW

250kbps

120kbps

T1 TRANSMITTING AT 250kbps

T2 TRANSMITTING AT 15.6kbps

-1

-2

-3

-4

-5

-6

20kbps

6

15

10

5

4

V

2

OUT-

FOR DATA RATES UP TO 250kbps

0

1000

2000

3000

4000

5000

0

1000

2000

3000

4000

5000

0

1000

2000

3000

4000

5000

LOAD CAPACITANCE (pF)

4

_______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

Typical Operating Characteristics (continued)

(V

= +3.3V, 2ꢀꢂ5bps data rate, ꢂ.1µF capacitors, all transmitters loaded with 35Ω and ꢁ , T = +2ꢀ°ꢁ, unless otherwise noted.)

ꢁꢁ

L

A

MAX3241E

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

MAX3241E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3241E

SLEW RATE vs. LOAD CAPACITANCE

14

12

10

8

60

50

40

30

20

10

0

6

5

1 TRANSMITTER AT 250kbps

2 TRANSMITTERS AT 15.6kbps

V

OUT+

4

250kbps

3

1 TRANSMITTER AT 250kbps

2 TRANSMITTERS AT 15.6kbps

2

120kbps

1

0

6

20kbps

-1

-2

-3

-4

-5

-6

4

2

V

OUT-

0

1000

2000

3000

4000

5000

0

1000

2000

3000

4000

5000

0

1000

2000

3000

4000

5000

LOAD CAPACITANCE (pF)

MAX3237E

SLEW RATE vs. LOAD CAPACITANCE

(MBAUD = GND)

MAX3237E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE (MBAUD = V

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

)

CC

7.5

12

6

5

1Mbps

V

+

5.0

2.5

0

10

8

OUT

4

2Mbps

1.5Mbps

SR-

SR+

3

2

1 TRANSMITTER AT FULL DATA RATE

FOR DATA RATES UP TO 250kbps

1 TRANSMITTER 250kbps

1

4 TRANSMITTERS AT 1/16 DATA RATE

6

4

3kΩ + C LOAD, EACH OUTPUT

L

4 TRANSMITTERS 15.6kbps

ALL TRANSMITTERS LOADED

0

-1

-2

-3

-4

-5

-6

WITH 3kΩ + C

-2.5

-5.0

-7.5

L

1 TRANSMITTER AT 250kbps

4 TRANSMITTERS 15.6kbps

ALL TRANSMITTERS LOADED

1.5Mbps

1Mbps

2Mbps

2

0

WITH 3kΩ + C

V

L

OUT-

0

500

1000

1500

2000

0

500

1000 1500 2000 2500 3000

LOAD CAPACITANCE (pF)

0

500 1000 1500 2000 2500 300

LOAD CAPACITANCE (pF)

MAX3237E

SUPPLY CURRENT vs. LOAD CAPACITANCE

WHEN TRANSMITTING DATA (MBAUD = GND)

TRANSMITTER SKEW vs. LOAD CAPACITANCE

(MBAUD = V

SLEW RATE vs. LOAD CAPACITANCE

(MBAUD = V

)

CC

50

100

80

60

40

20

0

70

60

50

40

30

20

250kbps

120kbps

40

30

20

10

0

-SLEW, 1Mbps

+SLEW, 1Mbps

-SLEW, 2Mbps

+SLEW, 2Mbps

20kbps

1 TRANSMITTER AT 20kbps, 120kbps, 250kbps

4 TRANSMITTERS AT 15.6kbps

ALL TRANSMITTERS LOADED

|t_PLH- t

|

PHL

1 TRANSMITTER AT FULL DATA RATE

4 TRANSMITTERS AT 1/16 DATA RATE

3kΩ + C LOAD EACH OUTPUT

1 TRANSMITTER AT 500kbps

4 TRANSMITTERS AT 1/16 DATA RATE

ALL TRANSMITTERS LOADED

10

0

WITH 3kΩ + C

L

WITH 3kΩ + C

L

0

500

1000

1500

2000

0

500

1000 1500 2000 2500 3000

0

500

1000

1500

2000

LOAD CAPACITANCE (pF)

_______________________________________________________________________________________

5

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

Typical Operating Characteristics (continued)

(V

= +3.3V, 2ꢀꢂ5bps data rate, ꢂ.1µF capacitors, all transmitters loaded with 35Ω and ꢁ , T = +2ꢀ°ꢁ, unless otherwise noted.)

ꢁꢁ

L

A

MAX3237E

TRANSMITTER OUTPUT VOLTAGE vs.

SUPPLY VOLTAGE (MBAUD = GND)

MAX3237E

SUPPLY CURRENT vs.

SUPPLY VOLTAGE (MBAUD = GND)

50

40

30

6

5

V

+

OUT

4

3

2

1 TRANSMITTER 250kbps

4 TRANSMITTERS 15.6kbps

ALL TRANSMITTERS LOADED

WITH 3kΩ +1000pF

1

0

-1

-2

-3

-4

-5

-6

20

1 TRANSMITTER AT 250kbps

4 TRANSMITTERS AT 15.6kbps

ALL TRANSMITTERS LOADED

WITH 3kΩ AND 1000pF

10

0

V

OUT-

4.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

2.0

2.5

3.0

3.5

4.0

5.0

SUPPLY VOLTAGE (V)

______________________________________________________________Pin Description

MAX3222E

MAX3232E

NAME

FUNCTION

MAX3237E

MAX3241E

TSSOP/

SO/DIP

SSOP

1

2

3

4

1

—

1

—

13*

28

27

2ꢀ

23

28

27

24

Receiver Enable. Active low.

EN

ꢁ1+

V+

Positive Terminal of Voltage-Doubler

ꢁharge-Pump ꢁapacitor

2

3

4

2

3

4

2

+ꢀ.ꢀV Generated bꢅ the ꢁharge Pump

Negative Terminal of Voltage-Doubler

ꢁharge-Pump ꢁapacitor

3

ꢁ1-

Positive Terminal of Inverting ꢁharge-

Pump ꢁapacitor

ꢀ

4

ꢀ

1

ꢁ2+

Negative Terminal of Inverting

ꢁharge-Pump ꢁapacitor

6

7

6

7

ꢀ

6

7

3

4

2

3

ꢁ2-

V-

-ꢀ.ꢀV Generated bꢅ the ꢁharge Pump

RS-232 Transmitter Outputs

ꢀ, 6, 7,

1ꢂ, 12

8, 1ꢀ

8, 17

7, 14

8, 17

9, 1ꢂ, 11

T_OUT

9, 14

9, 16

8, 13

9, 12

9, 16

8, 9, 11

4–8

R_IN

RS-232 Receiver Inputs

1ꢂ, 13

1ꢂ, 1ꢀ

12, 1ꢀ

18, 2ꢂ, 21

1ꢀ–19

R_OUT

TTL/ꢁMOS Receiver Outputs

17*, 19*, 22*,

23*, 24*

11, 12

16

12, 13

18

1ꢂ, 11

1ꢀ

13, 14

18

12, 13, 14

2ꢀ

T_IN

GND

TTL/ꢁMOS Transmitter Inputs

Ground

2

6

_______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

_________________________________________________Pin Description (continued)

MAX3222E

MAX3232E

NAME

FUNCTION

MAX3237E

MAX3241E

TSSOP/

SO/DIP

SSOP

17

18

19

16

—

19

26

22

V

+3.ꢂV to +ꢀ.ꢀV Supplꢅ Voltage

Shutdown ꢁontrol. Active low.

ꢁꢁ

2ꢂ

—

14*

SHDN

1, 1ꢂ, 11,

2ꢂ

—

11, 14

—

1ꢀ*

16

—

N.ꢁ.

No ꢁonnection

Megaꢄaud ꢁontrol Input. ꢁonnect to

GND for normal operation% connect to

—

MꢄAUD

R_OUTꢄ

V

ꢁꢁ

for 1Mbps transmission rates.

Noninverting ꢁomplementarꢅ

Receiver Outputs. Alwaꢅs active.

—

2ꢂ, 21

*These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.

ance state when the device is in shutdown mode (SHDN =

_______________Detailed Description

GND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E

Dual Charge-Pump Voltage Converter

The MAX3222E/MAX3232E/MAX3237E/MAX3241E’s

internal power supplꢅ consists of a regulated dual

charge pump that provides output voltages of +ꢀ.ꢀV

(doubling charge pump) and -ꢀ.ꢀV (inverting charge

permit the outputs to be driven up to 12V in shutdown.

The MAX3222E/MAX3232E/MAX3241E transmitter

inputs do not have pull-up resistors. ꢁonnect unused

inputs to GND or Vꢁꢁ. The MAX3237E transmitter

inputs have a 4ꢂꢂ5Ω active positive feedbac5 resistor,

allowing unused inputs to be left unconnected.

pump), over the 3.ꢂV to ꢀ.ꢀV V

range. The charge

ꢁꢁ

pump operates in discontinuous mode% if the output

voltages are less than ꢀ.ꢀV, the charge pump is

enabled, and if the output voltages exceed ꢀ.ꢀV, the

charge pump is disabled. Each charge pump requires

a flꢅing capacitor (ꢁ1, ꢁ2) and a reservoir capacitor

(ꢁ3, ꢁ4) to generate the V+ and V- supplies (Figure 1).

MAX3237E MegaBaud Operation

For higher-speed serial communications, the MAX3237E

features Megaꢄaud operation. In Megaꢄaud operating

mode (MꢄAUD = V ), the MAX3237E transmitters

ꢁꢁ

guarantee a 1Mbps data rate with worst-case loads of

35Ω in parallel with 2ꢀꢂpF for 3.ꢂV < V

< 4.ꢀV. For ꢀV

ꢁꢁ

RS-232 Transmitters

The transmitters are inverting level translators that con-

vert TTL/ꢁMOS-logic levels to ꢀ.ꢂV EIA/TIA-232-com-

pliant levels.

1ꢂ0 operation, the MAX3237E transmitters guarantee a

1Mbps data rate into worst-case loads of 35Ω in parallel

with 1ꢂꢂꢂpF.

RS-232 Receivers

The receivers convert RS-232 signals to ꢁMOS-logic

output levels. The MAX3222E/MAX3237E/MAX3241E

receivers have inverting three-state outputs. Drive EN

high to place the receiver(s) into a high-impedance

state. Receivers can be either active or inactive in shut-

down (Table 1).

The MAX3222E/MAX3232E/MAX3237E/MAX3241E

transmitters guarantee a 2ꢀꢂ5bps data rate with worst-

case loads of 35Ω in parallel with 1ꢂꢂꢂpF, providing

compatibilitꢅ with Pꢁ-to-Pꢁ communication software

(such as LapLin5™). Transmitters can be paralleled to

drive multiple receivers or mice.

The MAX3222E/MAX3237E/MAX3241E’s transmitters are

disabled and the outputs are forced into a high-imped-

LapLink is a trademark of Traveling Software.

_______________________________________________________________________________________

7

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

V

CC

0.1µF

V

CC

C1+

V+

V-

V+

V-

C1

C2

C1

C2

C3

C4

C3

C4

C1-

C2+

C1-

C2+

MAX3222E

MAX3232E

MAX3237E

MAX3241E

MAX3222E

MAX3232E

MAX3237E

MAX3241E

C2-

T_ OUT

R_ IN

T_ OUT

R_ IN

T_ IN

R_ OUT

5k

2500pF

150pF

3k

7k

GND

MINIMUM SLEW-RATE TEST CIRCUIT

MAXIMUM SLEW-RATE TEST CIRCUIT

Figure 1. Slew-Rate Test Circuits

The complementarꢅ outputs on the MAX3237E/MAX3241E

(R_OUTꢄ) are alwaꢅs active, regardless of the state of EN

or SHDN. This allows the device to be used for ring indica-

tor applications without forward biasing other devices con-

nected to the receiver outputs. This is ideal for sꢅstems

down mode is not used. SHDN has no effect on R_OUT

or R_OUTꢄ (MAX3237E/MAX3241E).

15kV ESD Protection

As with all Maxim devices, ESD-protection structures

are incorporated to protect against electrostatic

discharges encountered during handling and assem-

blꢅ. The driver outputs and receiver inputs of the

where V

drops to ꢂ in shutdown to accommodate

ꢁꢁ

peripherals such as UARTs (Figure 2).

MAX3222E/MAX3237E/MAX3241E

Shutdown Mode

Supplꢅ current falls to less than 1µA in shutdown mode

(SHDN = low). The MAX3237E’s supplꢅ current falls to

1ꢂnA (tꢅp) when all receiver inputs are in the invalid

range (-ꢂ.3V < R_IN < +ꢂ.3). When shut down, the

device’s charge pumps are shut off, V+ is pulled down

Table 1. MAX3222E/MAX3237E/MAX3241E

Shutdown and Enable Control Truth Table

R_OUTB

T_OUT

R_OUT

(MAX3237E/

MAX3241E)

SHDN

EN

to V , V- is pulled to ground, and the transmitter

ꢁꢁ

ꢂ

1

ꢂ

1

ꢂ

1

ꢃigh-Z

Active

ꢃigh-Z

Active

ꢃigh-Z

Active

outputs are disabled (high impedance). The time

required to recover from shutdown is tꢅpicallꢅ 1ꢂꢂµs,

as shown in Figure 3. ꢁonnect SHDN to V

if the shut-

ꢁꢁ

8

______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

MAX3222E/MAX3232E/MAX3237E/MAX3241E have

extra protection against static electricitꢅ. Maxim’s engi-

neers have developed state-of-the-art structures to pro-

tect these pins against ESD of 1ꢀ5V without damage.

The ESD structures withstand high ESD in all states:

normal operation, shutdown, and powered down. After

an ESD event, Maxim’s E versions 5eep wor5ing without

latchup, whereas competing RS-232 products can

latch and must be powered down to remove latchup.

Furthermore, the MAX3237E logic I/O pins also have

1ꢀ5V ESD protection. Protecting the logic I/O pins to

1ꢀ5V ma5es the MAX3237E ideal for data cable appli-

cations.

ESD protection can be tested in various waꢅs% the

transmitter outputs and receiver inputs for the

MAX3222E/MAX3232E/MAX3241E are characterized

for protection to the following limits:

V

CC

•

1ꢀ5V using the ꢃuman ꢄodꢅ Model

85V using the ꢁontact Discharge method specified

in IEꢁ 1ꢂꢂꢂ-4-2

V

CC

PROTECTION

DIODE

•

1ꢀ5V using IEꢁ 1ꢂꢂꢂ-4-2’s Air-Gap Discharge

method

Rx

5k

For the MAX3237E, all logic and RS-232 I/O pins are

characterized for protection to 1ꢀ5V per the ꢃuman

ꢄodꢅ Model.

UART

Tx

GND

SHDN = GND

ESD Test Conditions

ESD performance depends on a varietꢅ of conditions.

ꢁontact Maxim for a reliabilitꢅ report that documents

test setup, test methodologꢅ, and test results.

a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM

ACTIVE RECEIVER OUTPUT IN SHUTDOWN.

Human Body Model

Figure 4a shows the ꢃuman ꢄodꢅ Model, and Figure

4b shows the current waveform it generates when dis-

charged into a low impedance. This model consists of

a 1ꢂꢂpF capacitor charged to the ESD voltage of inter-

est, which is then discharged into the test device

through a 1.ꢀ5Ω resistor.

V

CC

TO

µP

LOGIC

TRANSITION

DETECTOR

MAX3237E/MAX3241E

R1OUTB

V

CC

PROTECTION

5V/div

0

SHDN

DIODE

R1IN

Rx

R1OUT

THREE-STATED

T2OUT

EN = V

CC

5k

UART

2V/div

0

T1OUT

T1IN

Tx

GND

SHDN = GND

T1OUT

V

= 3.3V

CC

b) NEW MAX3237E/MAX3241E: EN SHUTS DOWN RECEIVER OUTPUTS

C1–C4 = 0.1µF

(EXCEPT FOR B OUTPUTS), SO NO CURRENT FLOWS TO UART IN SHUTDOWN.

B OUTPUTS INDICATE RECEIVER ACTIVITY DURING SHUTDOWN WITH EN HIGH.

40µs/div

Figure 2. Detection of RS-232 Activity when the UART and

Interface are Shut Down; Comparison of MAX3237E/

MAX3241E (b) with Previous Transceivers (a)

Figure 3. Transmitter Outputs Recovering from Shutdown or

Powering Up

_______________________________________________________________________________________

9

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

IEC 1000-4-2

The IEꢁ 1ꢂꢂꢂ-4-2 standard covers ESD testing and per-

formance of finished equipment% it does not specificallꢅ

refer to integrated circuits. The MAX3222E/MAX3232E/

MAX3237E/MAX3241E help ꢅou design equipment that

meets Level 4 (the highest level) of IEꢁ 1ꢂꢂꢂ-4-2, without

the need for additional ESD-protection components.

The Air-Gap Discharge test involves approaching the

device with a charged probe. The ꢁontact Discharge

method connects the probe to the device before the

probe is energized.

Machine Model

The Machine Model for ESD tests all pins using a

2ꢂꢂpF storage capacitor and zero discharge resis-

tance. Its objective is to emulate the stress caused bꢅ

contact that occurs with handling and assemblꢅ during

manufacturing. All pins require this protection during

manufacturing, not just RS-232 inputs and outputs.

Therefore, after Pꢁ board assemblꢅ, the Machine

Model is less relevant to I/O ports.

The major difference between tests done using the

ꢃuman ꢄodꢅ Model and IEꢁ 1ꢂꢂꢂ-4-2 is higher pea5

current in IEꢁ 1ꢂꢂꢂ-4-2 because series resistance is

lower in the IEꢁ 1ꢂꢂꢂ-4-2 model. ꢃence, the ESD with-

stand voltage measured to IEꢁ 1ꢂꢂꢂ-4-2 is generallꢅ

lower than that measured using the ꢃuman ꢄodꢅ

Model. Figure ꢀa shows the IEꢁ 1ꢂꢂꢂ-4-2 model, and

Figure ꢀb shows the current waveform for the 85V IEꢁ

1ꢂꢂꢂ-4-2 Level 4 ESD ꢁontact Discharge test.

R

C

D

1MΩ

1500Ω

I 100%

P

90%

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

I

r

DISCHARGE

RESISTANCE

CHARGE-CURRENT

LIMIT RESISTOR

AMPERES

HIGH-

VOLTAGE

DC

DEVICE

UNDER

TEST

C

STORAGE

CAPACITOR

s

36.8%

100pF

SOURCE

10%

0

TIME

0

t

RL

t

DL

CURRENT WAVEFORM

Figure 4a. Human Body ESD Test Model

Figure 4b. Human Body Model Current Waveform

I

100%

R

D

330Ω

C

90%

50MΩ to 100MΩ

DISCHARGE

RESISTANCE

CHARGE-CURRENT

LIMIT RESISTOR

HIGH-

VOLTAGE

DC

DEVICE

UNDER

TEST

C

s

150pF

STORAGE

CAPACITOR

SOURCE

10%

t

t = 0.7ns to 1ns

r

30ns

60ns

Figure 5b. IEC 1000-4-2 ESD Generator Current Waveform

Figure 5a. IEC 1000-4-2 ESD Test Model

10 ______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

6

Table 2. Required Minimum Capacitor

Values

5

V

4

3

OUT+

V

= 3.0V

CC

V

(V)

C1

(µF)

C2, C3, C4

(µF)

CC

2

V

1

OUT+

OUT-

MAX3222E/MAX3232E/MAX3241E

0

3.ꢂ to 3.6

4.ꢀ to ꢀ.ꢀ

3.ꢂ to ꢀ.ꢀ

MAX3237E

3.ꢂ to 3.6

3.1ꢀ to 3.6

4.ꢀ to ꢀ.ꢀ

3.ꢂ to ꢀ.ꢀ

ꢂ.1

ꢂ.ꢂ47

ꢂ.1

-1

-2

-3

-4

-5

-6

ꢂ.33

ꢂ.47

V

CC

1

V

OUT-

9

ꢂ.22

ꢂ.1

ꢂ.22

ꢂ.1

0

2

3

4

5

6

7

8

10

LOAD CURRENT PER TRANSMITTER (mA)

ꢂ.ꢂ47

ꢂ.22

ꢂ.33

1.ꢂ

Figure 6a. MAX3241E Transmitter Output Voltage vs. Load

Current per Transmitter

Transmitter Outputs when

Recovering from Shutdown

___________Applications Information

Capacitor Selection

The capacitor tꢅpe used for ꢁ1–ꢁ4 is not critical for

proper operation% polarized or nonpolarized capacitors

can be used. The charge pump requires ꢂ.1µF capaci-

tors for 3.3V operation. For other supplꢅ voltages, see

Table 2 for required capacitor values. Do not use val-

ues smaller than those listed in Table 2. Increasing the

capacitor values (e.g., bꢅ a factor of 2) reduces ripple

on the transmitter outputs and slightlꢅ reduces power

consumption. ꢁ2, ꢁ3, and ꢁ4 can be increased without

changing ꢁ1’s value. However, do not increase C1

without also increasing the values of C2, C3, C4,

Figure 3 shows two transmitter outputs when recover-

ing from shutdown mode. As theꢅ become active, the

two transmitter outputs are shown going to opposite

RS-232 levels (one transmitter input is high, the other is

low). Each transmitter is loaded with 35Ω in parallel with

2ꢀꢂꢂpF. The transmitter outputs displaꢅ no ringing or

undesirable transients as theꢅ come out of shutdown.

Note that the transmitters are enabled onlꢅ when the

magnitude of V- exceeds approximatelꢅ -3V.

Mouse Driveability

The MAX3241E has been specificallꢅ designed to

power serial mice while operating from low-voltage

power supplies. It has been tested with leading mouse

brands from manufacturers such as Microsoft and

Logitech. The MAX3241E successfullꢅ drove all serial

mice tested and met their respective current and volt-

age requirements. Figure 6a shows the transmitter out-

put voltages under increasing load current at 3.ꢂV.

Figure 6b shows a tꢅpical mouse connection using the

MAX3241E.

and C

to maintain the proper ratios (C1 to

BYPASS

the other capacitors).

When using the minimum required capacitor values,

ma5e sure the capacitor value does not degrade

excessivelꢅ with temperature. If in doubt, use capaci-

tors with a larger nominal value. The capacitor’s equiv-

alent series resistance (ESR), which usuallꢅ rises at low

temperatures, influences the amount of ripple on V+

and V-.

High Data Rates

The MAX3222E/MAX3232E/MAX3237E/MAX3241E

maintain the RS-232 ꢀ.ꢂV minimum transmitter output

voltage even at high data rates. Figure 7 shows a trans-

mitter loopbac5 test circuit. Figure 8 shows a loopbac5

test result at 12ꢂ5bps, and Figure 9 shows the same test

at 2ꢀꢂ5bps. For Figure 8, all transmitters were driven

simultaneouslꢅ at 12ꢂ5bps into RS-232 loads in parallel

with 1ꢂꢂꢂpF. For Figure 9, a single transmitter was driv-

en at 2ꢀꢂ5bps, and all transmitters were loaded with an

RS-232 receiver in parallel with 1ꢂꢂꢂpF.

Power-Supply Decoupling

In most circumstances, a ꢂ.1µF V

bꢅpass capacitor

ꢁꢁ

is adequate. In applications that are sensitive to power-

supplꢅ noise, use a capacitor of the same value as

charge-pump capacitor ꢁ1. ꢁonnect bꢅpass capaci-

tors as close to the Iꢁ as possible.

Operation Down to 2.7V

Transmitter outputs will meet EIA/TIA-ꢀ62 levels of

3.7V with supplꢅ voltages as low as 2.7V.

______________________________________________________________________________________ 11

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

V

= 3V

CC

to 5.5V

C

BYPASS

26

27

3

28

V

CC

C1+

C1-

V+

V-

C1

C2

C3

C4

24

COMPUTER SERIAL PORT

1

2

C2+

MAX3241E

C2-

9

T1IN

14

T1OUT

T2OUT

T3OUT

+V

T2IN

10

11

13

T3IN

12

21

V

CC

-V

R1OUTB

GND

Tx

20

19

R2OUTB

R1OUT

R1IN

R2IN

R3IN

R4IN

4

5

6

5k

18

17

16

R2OUT

R3OUT

5k

7

R4OUT

R5OUT

EN

MOUSE

15

23

R5IN

8

22

SHDN

V

CC

GND

25

Figure 6b. Mouse Driver Test Circuit

The MAX3237E maintains the RS-232 ꢀ.ꢂV minimum

transmitter output voltage at data rates up to 1Mbps.

Figure 1ꢂ shows a loopbac5 test result at 1Mbps with

Interconnection with 3V and 5V Logic

The MAX3222E/MAX3232E/MAX3237E/MAX3241E can

directlꢅ interface with various ꢀV logic families, includ-

ing AꢁT and ꢃꢁT ꢁMOS. See Table 3 for more infor-

mation on possible combinations of interconnections.

MꢄAUD = V . For Figure 1ꢂ, all transmitters were

ꢁꢁ

loaded with an RS-232 receiver in parallel with 2ꢀꢂpF.

12 ______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

Table 3. Logic-Family Compatibility with

Various Supply Voltages

5V/div

T1IN

SYSTEM

POWER-SUPPLY

VOLTAGE

(V)

V

CC

SUPPLY

VOLTAGE

(V)

COMPATIBILITY

ꢁompatible with all

ꢁMOS families

T1OUT

R1OUT

3.3

ꢀ

3.3

ꢀ

ꢁompatible with all

TTL and ꢁMOS fami-

lies

V

= 3.3V

CC

C1–C4 = 0.1µF

ꢁompatible with AꢁT

and ꢃꢁT ꢁMOS, and

with Aꢁ, ꢃꢁ, or

2µs/div

ꢀ

3.3

Figure 8. MAX3241E Loopback Test Result at 120kbps

ꢁD4ꢂꢂꢂ ꢁMOS

5V/div

T1IN

T1OUT

R1OUT

V

CC

0.1µF

5V/div

V

CC

C1+

V+

C3

C1

C1-

C2+

V

= 3.3V, C1–C4 = 0.1µF

CC

MAX3222E

MAX3232E

MAX3237E

MAX3241E

V-

C4

C2

2µs/div

C2-

Figure 9. MAX3241E Loopback Test Result at 250kbps

T_ OUT

R_ IN

T_ IN

R_ OUT

+5V

5k

T_IN

1000pF

0

+5V

GND

0

-5V

+5V

0

T_OUT

5kΩ + 250pF

V

= 3.3V

CC

C1–C4 = 0.1µF

R_OUT

Figure 7. Loopback Test Circuit

400ns/div

Figure 10. MAX3237E Loopback Test Result at 1000kbps

(MBAUD = V

)

CC

______________________________________________________________________________________ 13

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

Pin Configurations

TOP VIEW

N.C.

C1+

V+

1

2

N.C.

EN

C1+

V+

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

SHDN

18

17

16

15

14

13

12

11

EN

C1+

V+

1

2

SHDN

20

19

18

17

16

15

14

13

12

11

V

CC

V

CC

V

CC

GND

3

GND

3

T1OUT

R1IN

C1-

4

T1OUT

R1IN

C1-

T1OUT

R1IN

R1OUT

N.C.

C1-

4

MAX3232E

MAX3222E

C2+

C2-

5

C2+

C2-

C2+

C2-

5

R1OUT

T1IN

6

R1OUT

T1IN

6

V-

7

V-

7

T2OUT

T2IN

8

T2IN

T2OUT

R2IN

T2OUT

T1IN

8

R2OUT

N.C.

R2IN

N.C.

9

10 R2OUT

T2IN

R2IN

9

R2OUT

10

N.C.

10

SO/DIP

TSSOP

TSSOP/SSOP

1

2

3

4

5

6

7

8

C1+

V+

V

CC

16

15

14

28

27

26

28

27

26

25

24

23

22

1

2

1

2

3

4

5

6

7

8

9

C2+

C2-

C2+

GND

C1+

V+

C1+

V+

GND

C1-

T1OUT

V

C2-

V-

3

CC

V

CC

MAX3232E

C2+

C2-

13 R1IN

12 R1OUT

11 T1IN

V-

25 C1-

4

R1IN

R2IN

R3IN

R4IN

R5IN

T1OUT

GND

C1-

T1IN

T1OUT

T2OUT

T3OUT

5

24

23

MAX3237E

MAX3241E

V-

6

T2IN

EN

10

9

T2OUT

R2IN

T2IN

7

22 T3IN

21

SHDN

R2OUT

21 R1OUTB

8

R1IN

R2IN

R1OUT

R2OUTB

R1OUT

9

20

19

20

19

R2OUT

T4IN

SSOP/SO/DIP

10

11

12

13

14

T2OUT 10

T4OUT

R3IN

18 R3OUT

T5IN

T3OUT

T3IN

18 R2OUT

17 R3OUT

16 R4OUT

11

12

13

14

17

T5OUT

EN

16 R1OUTB

T2IN

15

T1IN

MBAUD

R5OUT

SHDN

SSOP

SSOP/SO

14 ______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

__________________________________________________Typical Operating Circuits

+3.3V

17

16

C

BYPASS

V

CC

3

7

2

4

5

6

2

6

1

3

4

5

C1+

V+

C1

0.1µF

C1

0.1µF

C3*

0.1µF

C1-

C2+

C1-

C2+

MAX3222E

MAX3232E

V-

C2

0.1µF

C2

0.1µF

C4

0.1µF

C4

0.1µF

C2-

12

T1OUT

T1IN

15

8

11

T1OUT

T1IN

14

7

TTL/CMOS

INPUTS

RS-232

TTL/CMOS

INPUTS

RS-232

OUTPUTS

T2IN

T2OUT

R1IN

11

T2IN

T2OUT

R1IN

10

14

9

13 R1OUT

10 R2OUT

13

8

12 R1OUT

TTL/CMOS

OUTPUTS

TTL/CMOS

OUTPUTS

RS-232

INPUTS

5k

RS-232

INPUTS

5k

R2IN

9

R2OUT

R2IN

5k

EN

1

18

SHDN

GND

16

GND

15

*C3 CAN BE RETURNED TO EITHER V OR GROUND.

CC

NOTE: PIN NUMBERS REFER TO SO/DIP PACKAGES.

SEE TABLE 2 FOR CAPACITOR SELECTION.

______________________________________________________________________________________ 15

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

_____________________________________Typical Operating Circuits (continued)

+3.3V

C

BYPASS

28

BYPASS

28

26

V

CC

27

4

27

3

C1+

V+

V-

V+

C1

C3*

0.1µF

^C3*

0.1µF

25

1

24

1

C1-

C2+

C1-

C2+

0.1µF

MAX3237E

MAX3241E

V-

C2

0.1µF

C4

0.1µF

3

2

C2-

T1IN

T1OUT

T2OUT

T3OUT

5

6

7

T1OUT

9

24

14

13

T1

T2

T2IN

T3IN

T2IN

T2OUT 10

23

22

TTL/CMOS

INPUTS

RS-232

OUTPUTS

T3IN

12

21

11

T3OUT

R1IN

RS-232

OUTPUTS

LOGIC

T3

T4

T5

INPUTS

R1OUTB

T4IN

T5IN

T4OUT 10

19

17

R2OUTB

R1OUT

20

19

12

T5OUT

R1IN

4

5

R1OUTB

R1OUT

16

21

5k

R2OUT

R3OUT

R4OUT

R2IN

R3IN

R4IN

R5IN

18

17

16

8

9

R1

R2

R3

5k

TTL/CMOS

OUTPUTS

5k

6

7

8

RS-232

INPUTS

RS-232

INPUTS

R2OUT

R3OUT

R2IN

R3IN

20

18

LOGIC

OUTPUTS

5k

11

5k

R5OUT

EN

15

23

15

14

MBAUD

SHDN

EN

13

22

SHDN

GND

2

GND

25

*C3 CAN BE RETURNED TO EITHER V OR GROUND.

CC

16 ______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

__Ordering Information (continued)

___________________Chip Information

TRANSISTOR ꢁOUNTS:

PART

TEMP. RANGE

ꢂ°ꢁ to +7ꢂ°ꢁ

-4ꢂ°ꢁ to +8ꢀ°ꢁ

ꢂ°ꢁ to +7ꢂ°ꢁ

-4ꢂ°ꢁ to +8ꢀ°ꢁ

-ꢂ°ꢁ to +7ꢂ°ꢁ

-4ꢂ°ꢁ to +8ꢀ°ꢁ

ꢂ°ꢁ to +7ꢂ°ꢁ

-4ꢂ°ꢁ to +8ꢀ°ꢁ

PIN-PACKAGE

18 Wide SO

18 Plastic DIP

Dice*

MAX3222E/MAX3232E: 1129

MAX3237E: 211ꢂ

MAX3222EꢁWN

MAX3222EꢁPN

MAX3222Eꢁ/D

MAX3222EEUP

MAX3222EEAP

MAX3222EEWN

MAX3222EEPN

MAX3232EꢁUP

MAX3232EꢁAE

MAX3232EꢁWE

MAX3232EꢁPE

MAX3232EEUP

MAX3232EEAE

MAX3232EEWE

MAX3232EEPE

MAX3237EꢁAI

MAX3237EEAI

MAX3241EꢁAI

MAX3241EꢁWI

MAX3241EEAI

MAX3241EEWI

MAX3241E: 133ꢀ

2ꢂ TSSOP

2ꢂ SSOP

18 Wide SO

18 Plastic DIP

2ꢂ TSSOP

16 SSOP

16 Wide SO

16 Plastic DIP

2ꢂ TSSOP

16 SSOP

16 Wide SO

16 Plastic DIP

28 SSOP

28 Wide SO

28 SSOP

28 Wide SO

*Dice are tested at T = +25°C, DC parameters only.

A

______________________________________________________________________________________ 17

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

________________________________________________________Package Information

18 ______________________________________________________________________________________

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

___________________________________________Package Information (continued)

______________________________________________________________________________________ 19

15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

NOTES

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Printed USA

is a registered trademark of Maxim Integrated Products.

型号:	MAX3232EEAE
是否无铅：	含铅
是否Rohs认证：	不符合
生命周期：	Obsolete
IHS 制造商：	MAXIM INTEGRATED PRODUCTS INC
零件包装代码：	SSOP
包装说明：	5.30 MM, MO-150, SSOP-16
针数：	16
Reach Compliance Code：	not_compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
Factory Lead Time：	1 week
风险等级：	7.58
Is Samacsys：	N
差分输出：	NO
驱动器位数：	2
输入特性：	SCHMITT TRIGGER
接口集成电路类型：	LINE TRANSCEIVER
接口标准：	EIA-232; TIA-232; V.24; V.28
JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e0
长度：	6.2 mm
湿度敏感等级：	1
功能数量：	2
端子数量：	16
最高工作温度：	85 °C
最低工作温度：	-40 °C
最小输出摆幅：	10 V
最大输出低电流：	0.0016 A
封装主体材料：	PLASTIC/EPOXY
封装代码：	SSOP
封装等效代码：	SSOP16,.3
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：	240
电源：	3.3/5 V
认证状态：	Not Qualified
最大接收延迟：
接收器位数：	2
座面最大高度：	1.99 mm
子类别：	Line Driver or Receivers
最大压摆率：	1 mA
最大供电电压：	5.5 V
最小供电电压：	3 V
标称供电电压：	3.3 V
表面贴装：	YES
技术：	BICMOS
温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING
端子节距：	0.65 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	20
宽度：	5.29 mm
Base Number Matches：	1

电子百科

产品导航

产品型号MAX3232EEAE的概述

产品型号MAX3232EEAE的Datasheet PDF文件预览

MAX3232EEAE相关产品

MAX3232EEAE相关文章

IC37:专业IC行业平台