Texas Instruments SN74ALS645A-1N Handleiding

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SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS278 – JANUARY 1995

Copyright  1995, Texas Instruments Incorporated

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

•Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

•True Logic

•3-State Outputs

•Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic (N)

and Ceramic (J) 300-mil DIPs

description

These octal bus transceivers are designed for

asynchronous two-way communication between

data buses. These devices transmit data from the

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

depending on the level at the direction-control

(DIR) input. The output-enable (OE) input can be

used to disable the device so that the buses are

eectively isolated.

The -1 version of the SN74ALS645A is identical

to the standard version, except that the

recommended maximum IOL is increased to

48 mA. There is no -1 version of the

SN54ALS645A.

The SN54ALS645A and SN54AS645 are

characterized for operation over the full military

temperature range of –55C to 125° °C. The

SN74ALS645A and SN74AS645 are

characterized for operation from 0°C to 70C.°

FUNCTION TABLE

INPUTS

OPERATION

OE DIR

OPERATION

LLB data to A bus

LHA data to B bus

H XIsolation

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

DIR

A1

A2

A3

A4

A5

A6

A7

A8

GND

VCC

OE

B1

B2

B3

B4

B5

B6

B7

B8

SN54ALS645A, SN54AS645 . . . J PACKAGE

SN74ALS645A, SN74AS645 . . . DW OR N PACKAGE

(TOP VIEW)

3 2 12019

9101112 13

4

5

6

7

8

18

17

16

15

14

B1

B2

B3

B4

B5

A3

A4

A5

A6

A7

SN54ALS645A, SN54AS645 . . . FK PACKAGE

(TOP VIEW)

A2

A1

DIR

B7

B6 OE

A8

GND

B8

V

CC

PRODUCTION DATA information is current as of publication date.

Products conform to specications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Product specificaties