SN54HCT645, SN74HCT645

OCTAL BUS TRANSCEIVERS

WITH 3STATE OUTPUTS

SCLS019D − MARCH 1984 − REVISED AUGUST 2003

1

POST OFFICE BOX 655303

To 15 LSTTL Loads

SN54HCT645 ...J OR W PACKAGE

SN74HCT645 ...DW, N, NS, OR PW PACKAGE

(TOP VIEW)

SN54HCT645 . . . 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

SN74HCT645N

SN74HCT645N

SOIC − DW

Tube of 25

SN74HCT645DW

HCT645

SOIC − DW

Reel of 2000

SN74HCT645DWR

HCT645

−40

°C to 85°C

SOP − NS

Reel of 2000

SN74HCT645NSR

HCT645

−40 C to 85 C

Tube of 70

SN74HCT645PW

TSSOP − PW

Reel of 2000

SN74HCT645PWR

HT645

TSSOP − PW

Reel of 250

SN74HCT645PWT

HT645

CDIP − J

Tube of 20

SNJ54HCT645J

SNJ54HCT645J

−55

°C to 125°C

CFP − W

Tube of 85

SNJ54HCT645W

SNJ54HCT645W

−55 C to 125 C

LCCC − FK

Tube of 55

SNJ54HCT645FK

SNJ54HCT645FK

† 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

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information 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.