MAX6800UR26D3+全新原装原理图各脚功能电路原理芯片引脚定义-中国IC网-芯三七

19-1933 Rev 1; 2/01

3-Pin, Low-Power

µP Reset Circuits

General Description

Features

ꢀ Ultra-Low 0.7V Operating Supply Voltage

ꢀ Low 4.0µA Supply Current

The MAX6800/MAX6801/MAX6802 microprocessor (µP)

supervisory circuits monitor the power supplies in 2.85V

to 5.0V µP and digital systems. They increase circuit

reliability and reduce cost by eliminating external com-

ponents and adjustments.

ꢀ Precision Monitoring of 2.85V to 5.0V Power-

Supply Voltages

These devices perform a single function—they assert a

ꢀ Reset Thresholds Available from 2.63V to 4.80V,

reset signal whenever the V

supply voltage declines

CC

in Approximately 100mV Increments

below a preset threshold, keeping it asserted for a preset

timeout period after V has risen above the reset

ꢀ Fully Specified over Temperature

CC

threshold. The only difference among the three devices

is their output. The MAX6801 (push/pull) and MAX6802

(open-drain) have an active-low RESET output, while the

MAX6800 (push/pull) has an active-high RESET output.

The MAX6800/MAX6801 are guaranteed to be in the cor-

ꢀ Three Power-On Reset Timeout Periods Available

(1ms min, 20ms min, 100ms min)

ꢀ Low Cost

ꢀ Three Available Output Structures: Push/Pull

RESET, Push/Pull RESET, Open-Drain RESET

rect state for V

down to 0.7V. The MAX6802 is guaran-

CC

teed to be in the correct state for V

down to 1.0V.

CC

The reset comparator in these ICs is designed to ignore

fast transients on V . Reset thresholds are factory-

CC

ꢀ Guaranteed RESET/RESET Valid to V

= 0.7V

CC

(MAX6800/MAX6801)

trimmable between 2.63V and 4.80V, in approximately

100mV increments. These devices are available with a

1ms (min), 20ms (min), or 100ms (min) reset pulse

width. Ideal for space-critical applications, the

MAX6800/MAX6801/MAX6802 come packaged in a 3-

pin SOT23. For a lower threshold voltage version, see

the MAX6332/MAX6333/MAX6334.

ꢀ Power-Supply Transient Immunity

ꢀ No External Components Required

ꢀ 3-Pin SOT23 Package

ꢀ Pin Compatible with MAX809/MAX810,

MAX6326/MAX6327/MAX6328, and

MAX6346/MAX6347/MAX6348

Applications

Computers

Controllers

Ordering Information

Intelligent Instruments

Critical µP/µC Power Monitoring

Portable/Battery-Powered Equipment

Automotive

PART*

TEMP. RANGE

-40°C to +125°C

PIN-PACKAGE

3 SOT23-3

MAX6800UR_ _D_-T

MAX6801UR_ _D_-T

MAX6802UR_ _D_-T

3 SOT23-3

*These devices are available in factory-set V

reset thresh-

CC

olds from 2.63V to 4.80V, in approximately 0.1V increments.

Choose the desired reset threshold suffix from Table 1 and

insert it in the blanks following “UR” in the part number.

Factory-programmed reset timeout periods are also available.

Insert the number corresponding to the desired nominal reset

timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in

the blank following “D” in the part number. There are 15 stan-

dard versions with a required order increment of 2500 pieces.

Sample stock is generally held on the standard versions only

(see Selector Guide). Contact the factory for availability of non-

standard versions (required order increment is 10,000 pieces).

All devices available in tape-and-reel only.

Typical Operating Circuit and Pin Configuration appear

at end of data sheet.

Selector Guide appears at end of data sheet.

________________________________________________________________ Maxim Integrated Products

1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

3-Pin, Low-Power

µP Reset Circuits

ABSOLUTE MAXIMUM RATINGS

Terminal Voltage (with respect to GND)

Continuous Power Dissipation (T = +70°C)

A

V

......................................................................-0.3V to +6V

3-Pin SOT23 (derate 4mW/°C above +70°C)..............320mW

Operating Temperature Range .........................-40°C to +125°C

Junction Temperature......................................................+150°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

CC

Push/Pull RESET, RESET .......................-0.3V to (V

Open-Drain RESET ..............................................-0.3V to +6V

+ 0.3V)

CC

Input Current (V ).............................................................20mA

Output Current (RESET, RESET).........................................20mA

CC

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_CC= full range, T = -40°C to +125°C, unless otherwise noted. Typical values are at V

A

= +5.0V and T = +25°C, reset not

A

CC

asserted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

0.7

TYP

MAX

5.5

10

UNITS

MAX6800/MAX6801

MAX6802

T

= 0°C to +125°C

A

1.0

Supply Voltage Range

(Note 2)

V

CC

MAX6800/MAX6801

MAX6802

0.78

1.2

= -40°C to +125°C

V

= +3.0V

= +5.0V

4

5

CC

Supply Current

Reset Threshold

I

No load

µA

V

CC

12

V

TH

+ 1.8%

TH

T

= +25°C

V

A

TH

- 1.8%

MAX680_UR_ _D_-T,

Table 1

V

TH

V

TH

+ 3%

TH

T = -40°C to +125°C

A

- 3%

V

Falling Reset Delay

V

falling at 10V/ms

CC

30

µs

CC

MAX680_UR_ _D1-T

MAX680_UR_ _D2-T

MAX680_UR_ _D3-T

1

1.5

30

2

Reset Active Timeout Period

t

20

40

ms

RP

100

150

200

0.4

0.3

0.4

I

= 50µA, V

≥ 1.0V

≥ 2.5V

SINK

CC

RESET Output Low Voltage

(MAX6801/MAX6802)

Reset

asserted

V

= 1.2mA, V

OL

OH

CC

≥ 4.25V

CC

I

= 500µA, V

= 800µA, V

≥ 3.0V 0.8 x V

≥ 5.0V 0.8 x V

SOURCE

CC

RESET Output High Voltage

(MAX6801)

Reset not

asserted

V

I

SOURCE

CC

I

= 1µA, V

≥1.0V

0.8 x V

SOURCE

CC

Reset

asserted

I

= 200µA, V

≥1.8V

SOURCE

CC

RESET Output Voltage

(MAX6800)

I

= 800µA, V ≥ 4.25V 0.8 x V

V

SOURCE

CC

I

= 1.2mA, V

≥3.0V

≥5.0V

0.3

0.4

Reset not

asserted

SINK

CC

V

OL

I

= 3.2mA, V

SINK

CC

RESET Output Leakage Current

(MAX6802)

V

> V , RESET not asserted

0.5

µA

CC

TH

Note 1: All parts are production tested at T = +25°C. Overtemperature limits are guaranteed by design and not production tested.

A

Note 2: I

for the MAX6800 is I00nA. I

for the MAX6801 is 100nA. I

for the MAX6802 is 50µA.

SOURCE

SINK

2

_______________________________________________________________________________________

3-Pin, Low-Power

µP Reset Circuits

Typical Operating Characteristics

(Reset not asserted, T = +25°C, unless otherwise noted.)

A

NORMALIZED RESET TIMEOUT PERIOD

vs. TEMPERATURE

RESET (V )

OL

vs. SUPPLY VOLTAGE

SUPPLY CURRENT vs. TEMPERATURE

6.5

6.0

5.5

5.0

4.5

4.0

3.5

3.0

1.050

1.040

1.030

1.020

1.010

1.000

0.990

0.980

0.970

0.960

0.950

80

60

40

20

0

V

SINK

= 2.93V

= 500µA

TH

+125°C

I

RESET ASSERTED

MAX6801/MAX6802

V

= +5.0V

+85°C

CC

+25°C

-40°C

V

= +3.3V

CC

-50 -25

0

25

50

75 100 125

-50 -25

0

25

50

75 100 125

1.0

1.5

2.0

2.5

3.0

TEMPERATURE (°C)

V

(V)

CC

MAXIMUM TRANSIENT DURATION

vs. RESET COMPARATOR OVERDRIVE

RESET (V

vs. SUPPLY VOLTAGE

)

V

FALLING PROPAGATION DELAY

vs. TEMPERATURE

OH

CC

600

500

400

300

200

100

0

100

75

50

25

0

100

V

= 2.93V

TH

90

80

70

60

50

40

30

20

10

0

I

= 100µA

SOURCE

RESET ASSERTED

(MAX6800)

V

= FALLING AT 1V/ms

CC

+125°C

RESET OCCURS

+85°C

+25°C

RESET DOES

NOT OCCUR

V

CC

= FALLING AT 10V/ms

-40°C

0.1

1

10

100

1000

1.0

1.5

2.0

2.5

3.0

-50 -25

0

25

50

75 100 125

RESET COMPARATOR OVERDRIVE (mV)

V

(V)

TEMPERATURE (°C)

CC

Pin Description

NAME

FUNCTION

MAX6801/

MAX6802

1

MAX6800

1

GND

Ground

Active-Low Reset Output. RESET is asserted while V

is below the reset

CC

threshold and remains asserted for a reset timeout period (t ) after V

rises above the reset threshold. RESET on the MAX6801 is push/pull.

RESET on the MAX6802 is open-drain.

RP

CC

—

2

RESET

Active-High Reset Output. RESET is asserted while V

is below the reset

CC

2

3

—

RESET

threshold and remains asserted for a reset timeout period (t ) after V

rises above the reset threshold. RESET on the MAX6800 is push/pull.

Supply Voltage Input

RP

CC

3

V

CC

_______________________________________________________________________________________

3

3-Pin, Low-Power

µP Reset Circuits

Negative-Going V

CC

Transients

Applications Information

Interfacing to µPs with Bidirectional

Reset Pins

In addition to issuing a reset to the µP during power-up,

power-down, and brownout conditions, these devices are

relatively immune to short-duration, negative-going V

CC

Since the RESET output on the MAX6802 is open-drain,

this device interfaces easily with µPs that have bidirec-

tional reset pins, such as the Motorola 68HC11.

Connecting the µP supervisor’s RESET output directly

to the microcontroller’s (µC’s) RESET pin with a single

pullup resistor allows either device to assert reset

(Figure 1).

transients (glitches). The Typical Operating Characteristics

show the Maximum Transient Duration vs. Reset

Comparator Overdrive graph. The graph shows the maxi-

mum pulse width that a negative-going V transient may

CC

typically have without issuing a reset signal. As the ampli-

tude of the transient increases, the maximum allowable

pulse width decreases.

V

CC

V

CC

V

CC

V

CC

100kΩ*

µP

MOTOROLA

68HCXX

100kΩ

MAX6801

MAX6800

MAX6802

RESET

100kΩ

GND

(a)

(b)

*ASSUMES HIGH-Z RESET INPUT TO THE µP

Figure 1. Interfacing to µPs with Bidirectional Reset Pins

Figure 2. Ensuring Reset Valid Down to V

= 0

CC

Pin Configuration

Typical Operating Circuit

TOP VIEW

V

CC

1

GND

V

CC

MAX6800

MAX6801

MAX6802

3

V

CC

µP

MAX6801

RESET

GND

2

RESET (RESET)

SOT23-3

(

) ARE FOR MAX6800

4

_______________________________________________________________________________________

3-Pin, Low-Power

µP Reset Circuits

Ensuring a Valid Reset Output

Down to V_CC= 0

to load RESET and small enough to pull it low. For the

MAX6800 application, where RESET must be valid to

V

= 0, a 100kΩ pullup resistor between RESET and

When V

falls below 1V and approaches the minimum

CC

will hold RESET high when V

falls below 0.7V

operating voltage of 0.7V, push/pull-structured reset

sinking (or sourcing) capabilities decrease drastically.

High-impedance CMOS-logic inputs connected to the

RESET pin can drift to indeterminate voltages. This

does not present a problem in most cases, since most

CC

(Figure 2b).

Since the MAX6802 has an open-drain, active-low out-

put, it typically uses a pullup resistor. With this device,

RESET will most likely not maintain an active condition,

but will drift to a non-active level due to the pullup

resistor and the reduced sinking capability of the open-

drain device. Therefore, this device is not recommend-

ed for applications where the RESET pin is required to

µPs and circuitry do not operate when V

drops

CC

below 1V. For the MAX6801 application, where RESET

must be valid down to 0, adding a pulldown resistor

between RESET and GND removes stray leakage cur-

rents, holding RESET low (Figure 2a). The pulldown

resistor value is not critical; 100kΩ is large enough not

be valid down to V

= 0.

CC

Table 1. Factory-Trimmed Reset Thresholds

RESET

THRESHOLD

SUFFIX

T

= +25°C

T = -40°C to +125°C

A

MIN

TYP (V

)

TH

MAX

4.886

4.785

4.713

4.581

4.459

4.377

4.276

4.174

4.072

3.970

3.868

3.767

3.665

3.563

3.461

3.359

3.258

3.135

3.054

2.983

2.850

2.749

2.677

MIN

MAX

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

4.714

4.615

4.547

4.419

4.301

4.223

4.124

4.026

3.928

4.830

3.732

3.633

3.535

3.437

3.339

3.241

3.142

3.025

2.946

2.877

2.750

2.651

2.583

4.80

4.70

4.63

4.50

4.38

4.30

4.20

4.10

4.00

3.90

3.80

3.70

3.60

3.50

3.40

3.30

3.20

3.08

3.00

2.93

2.80

2.70

2.63

4.656

4.559

4.491

4.365

4.249

4.171

4.074

3.977

3.880

3.783

3.686

3.589

3.492

3.395

3.298

3.201

3.104

2.988

2.910

2.842

2.716

2.619

2.551

4.944

4.841

4.769

4.635

4.511

4.429

4.326

4.223

4.120

4.017

3.914

3.811

3.708

3.605

3.502

3.399

3.296

3.172

3.090

3.018

2.884

2.781

2.709

_______________________________________________________________________________________

5

3-Pin, Low-Power

µP Reset Circuits

Selector Guide (Standard Versions*)

MIN RESET

TIMEOUT (ms)

SOT

TOP MARK

PART

OUTPUT STAGE

NOMINAL V (V)

TH

MAX6800UR26D3-T

MAX6800UR29D3-T

MAX6800UR31D3-T

MAX6800UR44D3-T

MAX6800UR46D3-T

MAX6801UR26D3-T

MAX6801UR29D3-T

MAX6801UR31D3-T

MAX6801UR44D3-T

MAX6801UR46D3-T

MAX6802UR26D3-T

MAX6802UR29D3-T

MAX6802UR31D3-T

MAX6802UR44D3-T

MAX6802UR46D3-T

Push/Pull RESET

Open-Drain RESET

2.63

2.93

3.08

4.38

4.63

2.63

2.93

3.08

4.38

4.63

2.63

2.93

3.08

4.38

4.63

100

FZIE

FZIF

FZIG

FZIH

FZII

FZIK

FZIM

FZIN

FZIO

FZIP

FZIQ

FZIR

FZIS

FZIT

FZIU

*Sample stock is generally held on all standard versions.

Chip Information

TRANSISTOR COUNT: 505

PROCESS: BiCMOS

6

_______________________________________________________________________________________

3-Pin, Low-Power

µP Reset Circuits

Package Information

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.

7 _____________________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:	MAX6800UR26D3+T
是否无铅：	不含铅
是否Rohs认证：	符合
生命周期：	Obsolete
零件包装代码：	SOT-23
包装说明：	SOT-23, 3 PIN
针数：	3
Reach Compliance Code：	compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
风险等级：	5.63
其他特性：	RESET THRESHOLD VOLTAGE IS 2.63V
可调阈值：	NO
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 代码：	R-PDSO-G3
JESD-609代码：	e3
长度：	2.92 mm
湿度敏感等级：	1
信道数量：	1
功能数量：	1
端子数量：	3
最高工作温度：	125 °C
最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP
封装等效代码：	TO-236
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260
电源：	0.8/5.5 V
认证状态：	Not Qualified
座面最大高度：	1.12 mm
子类别：	Power Management Circuits
最大供电电流 (Isup)：	0.012 mA
最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	0.78 V
标称供电电压 (Vsup)：	5 V
表面贴装：	YES
技术：	BICMOS
温度等级：	AUTOMOTIVE
端子面层：	Matte Tin (Sn)
端子形式：	GULL WING
端子节距：	0.95 mm
端子位置：	DUAL
阈值电压标称：	+2.63V
处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	1.3 mm
Base Number Matches：	1

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