80021供应商报价哪里找芯片批发报价原理和应用中文资料-中国IC网-芯三七

SN54LS245, SN74LS245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002

SN54LS245 . . . J OR W PACKAGE

SN74LS245 . . . DB, DW, N, OR NS PACKAGE

(TOP VIEW)

3-State Outputs Drive Bus Lines Directly

PNP Inputs Reduce dc Loading on Bus

Lines

Hysteresis at Bus Inputs Improves Noise

Margins

DIR

A1

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

V

CC

OE

B1

B2

B3

B4

B5

B6

B7

B8

A2

Typical Propagation Delay Times Port to

Port, 8 ns

A3

A4

A5

I

OL

OH

TYPE

(SINK

A6

(SOURCE

CURRENT)

A7

SN54LS245

SN74LS245

12 mA

24 mA

–12 mA

–15 mA

A8

GND

SN54LS245 . . . FK PACKAGE

(TOP VIEW)

description

These octal bus transceivers are designed for

asynchronous two-way communication between

data buses. The control-function implementation

minimizes external timing requirements.

3

2

1

20 19

18

B1

B2

B3

B4

B5

A3

A4

A5

A6

A7

4

5

6

7

8

The devices allow data transmission from the

A bus to the B bus or from the B bus to the A bus,

depending on the logic level at the

direction-control (DIR) input. The output-enable

(OE) input can disable the device so that the

buses are effectively isolated.

17

16

15

14

9 10 11 12 13

ORDERING INFORMATION

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

†

PACKAGE

T

A

PDIP – N

Tube

SN74LS245N

Tube

SN74LS245DW

SN74LS245DWR

SN74LS245NSR

SN74LS245DBR

SN54LS245J

SOIC – DW

LS245

0°C to 70°C

Tape and reel

Tube

SOP – NS

74LS245

SSOP – DB

LS245

SN54LS245J

SNJ54LS245J

SNJ54LS245W

SN54LS245FK

CDIP – J

Tube

SNJ54LS245J

SNJ54LS245W

SN54LS245FK

–55°C to 125°C

CFP – W

Tube

LCCC – FK

Tube

†

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design

guidelines are available at www.ti.com/sc/package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54LS245, SN74LS245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002

FUNCTION TABLE

INPUTS

OPERATION

OE

L

DIR

L

B data to A bus

A data to B bus

Isolation

L

H

X

schematics of inputs and outputs

EQUIVALENT OF EACH INPUT

TYPICAL OF ALL OUTPUTS

V

CC

V

CC

50 Ω NOM

9 kΩ NOM

Input

Output

logic diagram (positive logic)

1

DIR

19

OE

2

A1

18

B1

To Seven Other Channels

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54LS245, SN74LS245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002

†

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

CC

Input voltage, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

I

Package thermal impedance,

(see Note 2): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W

DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W

N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W

NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C

JA

Storage temperature range, T

stg

†

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 under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. All voltage values are with respect to GND.

2. The package thermal impedance is calculated in accordance with JESD 51-7.

recommended operating conditions

SN54LS245

MIN NOM

SN74LS245

MIN NOM

UNIT

MAX

5.5

MAX

5.25

–15

24

V

Supply voltage

4.5

5

4.75

5

V

CC

OH

OL

I

High-level output current

Low-level output current

Operating free-air temperature

–12

12

mA

°C

T

A

–55

125

0

70

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54LS245, SN74LS245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

SN54LS245

SN74LS245

†

PARAMETER

TEST CONDITIONS

UNIT

‡

MIN TYP

MAX

MIN TYP

MAX

V

High-level input voltage

Low-level input voltage

Input clamp voltage

2

V

IH

0.7

0.8

IL

V

= MIN,

= MIN

= MIN,

I = –18 mA

–1.5

IK

CC

I

Hysteresis (V – V

T+

)

T–

A or B

0.2

2.4

0.4

3.4

0.2

2.4

0.4

3.4

V

I

= –3 mA

= MAX

OH

OL

V

High-level output voltage

Low-level output voltage

V

= 2 V,

= V

OH

IH

IL

2

IL(max)

V

= MIN,

= 12 mA

= 24 mA

0.4

0.5

CC

IH

IL

= 2 V,

= V

OL

IL(max)

Off-state output current,

high-level voltage applied

V

= MAX,

CC

I

V

= 2.7 V

= 0.4 V

20

µA

OZH

O

OE at 2 V

Off-state output current,

low-level voltage applied

V

= MAX,

CC

OE at 2 V

V

–200

OZL

Input current at

maximum input

voltage

A or B

DIR or OE

V = 5.5 V

I

0.1

I

V

CC

= MAX

mA

V = 7 V

I

High-level input current

Low-level input current

Short-circuit output current

V

= MAX,

= MAX

V

= 2.7 V

= 0.4 V

20

–0.2

–225

70

20

–0.2

–225

70

µA

mA

IH

CC

IH

IL

V

IL

§

–40

40

OS

Total, outputs high

Total, outputs low

Outputs at high Z

48

62

64

48

62

64

I

Supply current

V

CC

= MAX

Outputs open

90

mA

CC

95

†

‡

§

For conditions shown as MIN or MAX, use the appropriate values specified under recommended operating conditions.

All typical values are at V = 5 V, T = 25°C.

Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second.

CC

A

switching characteristics, V

= 5 V, T = 25°C (see Figure 1)

A

CC

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

t

Propagation delay time, low- to high-level output

Propagation delay time, high- to low-level output

Output enable time to low level

8

12

40

25

28

PLH

PHL

PZL

PZH

PLZ

PHZ

C

= 45 pF,

= 5 pF,

R

= 667

ns

L

27

25

15

ns

Output enable time to high level

Output disable time from low level

C

L

Output disable time from high level

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54LS245, SN74LS245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002

PARAMETER MEASUREMENT INFORMATION

SERIES 54LS/74LS DEVICES

V

CC

Test

Point

R

L

Test

Point

S1

V

CC

From Output

Under Test

V

CC

(see Note B)

R

L

C

L

(see Note A)

From Output

Under Test

5 kΩ

R

L

(see Note B)

From Output

Under Test

C

Test

Point

C

L

(see Note A)

L

(see Note A)

S2

LOAD CIRCUIT

FOR 2-STATE TOTEM-POLE OUTPUTS

FOR OPEN-COLLECTOR OUTPUTS

FOR 3-STATE OUTPUTS

3 V

High-Level

Timing

Input

1.3 V

Pulse

0 V

t

h

w

t

su

3 V

0 V

Low-Level

Pulse

Data

Input

1.3 V

VOLTAGE WAVEFORMS

PULSE DURATIONS

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

Output

3 V

0 V

Control

(low-level

enabling)

1.3 V

3 V

0 V

Input

1.3 V

t

PLZ

PZL

t

PHL

PLH

Waveform 1

(see Notes C

and D)

≈1.5 V

In-Phase

Output

(see Note D)

1.3 V

V

OH

V

OL

+ 0.5 V

1.3 V

V

OL

t

PHZ

PZH

t

PLH

PHL

V

OH

Waveform 2

(see Notes C

and D)

V

OH

– 0.5 V

Out-of-Phase

Output

(see Note D)

V

OH

1.3 V

≈1.5 V

OL

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS

NOTES: A.

C

includes probe and jig capacitance.

L

B. All diodes are 1N3064 or equivalent.

C. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

D. S1 and S2 are closed for t

, t

, and t

; S1 is open and S2 is closed for t

PLZ PZH

; S1 is closed and S2 is open for t .

PLH PHL PHZ

PZL

E. Phase relationships between inputs and outputs have been chosen arbitrarily for these examples.

F. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, Z ≈ 50 Ω, t ≤ 1.5 ns, t ≤ 2.6 ns.

O

r

f

G. The outputs are measured one at a time with one input transition per measurement.

Figure 1. Load Circuits and Voltage Waveforms

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PACKAGE OPTION ADDENDUM

www.ti.com

28-Feb-2005

PACKAGING INFORMATION

Orderable Device

Status ⁽¹⁾

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

CDIP

CFP

Drawing

5962-8002101VRA

5962-8002101VSA

80021012A

ACTIVE

J

W

FK

W

FK

J

20

1

None

Call TI

Level-NC-NC-NC

1

LCCC

CFP

1

8002101SA

1

JM38510/32803B2A

JM38510/32803BRA

JM38510/32803BSA

SN54LS245J

LCCC

CDIP

CFP

1

W

J

1

CDIP

SSOP

1

SN74LS245DBR

DB

2000

Pb-Free

(RoHS)

CU NIPDAU Level-2-260C-1 YEAR/

Level-1-235C-UNLIM

SN74LS245DW

ACTIVE

SOIC

DW

20

25

Pb-Free

(RoHS)

CU NIPDAU Level-2-250C-1 YEAR/

Level-1-235C-UNLIM

SN74LS245DWR

2000

Pb-Free

(RoHS)

CU NIPDAU Level-2-250C-1 YEAR/

Level-1-235C-UNLIM

SN74LS245J

SN74LS245N

OBSOLETE

ACTIVE

CDIP

PDIP

J

20

None

Call TI

N

20

Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

SN74LS245N3

OBSOLETE

ACTIVE

PDIP

SO

N

20

None

Call TI

SN74LS245NSR

NS

2000

Pb-Free

(RoHS)

CU NIPDAU Level-2-260C-1 YEAR/

Level-1-235C-UNLIM

SNJ54LS245FK

SNJ54LS245J

SNJ54LS245W

ACTIVE

LCCC

CDIP

CFP

FK

J

20

1

None

Call TI

Level-NC-NC-NC

W

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional

product content details.

None: Not yet available Lead (Pb-Free).

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,

including bromine (Br) or antimony (Sb) above 0.1% of total product weight.

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

28-Feb-2005

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 2

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

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Use of such information may require a license from a third party under the patents or other intellectual property

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is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

Following are URLs where you can obtain information on other Texas Instruments products and application

solutions:

Products

Applications

Audio

Amplifiers

amplifier.ti.com

www.ti.com/audio

Data Converters

dataconverter.ti.com

Automotive

www.ti.com/automotive

DSP

dsp.ti.com

Broadband

Digital Control

Military

www.ti.com/broadband

www.ti.com/digitalcontrol

www.ti.com/military

Interface

Logic

interface.ti.com

logic.ti.com

Power Mgmt

Microcontrollers

power.ti.com

Optical Networking

Security

www.ti.com/opticalnetwork

www.ti.com/security

www.ti.com/telephony

www.ti.com/video

microcontroller.ti.com

Telephony

Video & Imaging

Wireless

www.ti.com/wireless

Mailing Address:

Texas Instruments

Post Office Box 655303 Dallas, Texas 75265

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