SN54HC640, SN74HC640

OCTAL BUS TRANSCEIVERS

WITH 3STATE OUTPUTS

SCLS303D − JANUARY 1996 − REVISED AUGUST 2003

1

POST OFFICE BOX 655303

To 15 LSTTL Loads

SN54HC640 ...J OR W PACKAGE

SN74HC640 ...DW, N, NS, OR PW PACKAGE

(TOP VIEW)

SN54HC640 . . . FK PACKAGE

(TOP VIEW)

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

OE

B1

B2

B3

B4

B5

B6

B7

B8

32

1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

B1

B2

B3

B4

B5

A3

A4

A5

A6

A7

description/ordering information

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 upon the

level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the

buses are effectively isolated.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP − N

Tube of 20

SN74HC640N

SN74HC640N

SOIC − DW

Tube of 25

SN74HC640DW

HC640

SOIC − DW

Reel of 2000

SN74HC640DWR

HC640

−40

°C to 85°C

SOP − NS

Reel of 2000

SN74HC640NSR

HC640

−40 C to 85 C

Tube of 70

SN74HC640PW

TSSOP − PW

Reel of 2000

SN74HC640PWR

HC640

TSSOP − PW

Reel of 250

SN74HC640PWT

HC640

CDIP − J

Tube of 20

SNJ54HC640J

SNJ54HC640J

−55

°C to 125°C

CFP − W

Tube of 85

SNJ54HC640W

SNJ54HC640W

−55 C to 125 C

LCCC − FK

Tube of 55

SNJ54HC640FK

SNJ54HC640FK

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

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

Copyright

 2003, Texas Instruments Incorporated

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.

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 MILPRF38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.