SN74CBT3257

4BIT 1OF2 FET MULTIPLEXER/DEMULTIPLEXER

SCDS017M − MAY 1995 − REVISED JANUARY 2004

1

POST OFFICE BOX 655303

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

S

1B1

1B2

1A

2B1

2B2

2A

GND

OE

4B1

4B2

4A

3B1

3B2

3A

D, DB, DBQ, OR PW PACKAGE

(TOP VIEW)

RGY PACKAGE

(TOP VIEW)

116

89

2

3

4

5

6

7

15

14

13

12

11

10

OE

4B1

4B2

4A

3B1

3B2

1B1

1B2

1A

2B1

2B2

2A

description/ordering information

The SN74CBT3257 is a 4-bit 1-of-2 high-speed TTL-compatible FET multiplexer/demultiplexer. The low

on-state resistance of the switch allows connections to be made with minimal propagation delay.

Output-enable (OE) and select-control (S) inputs select the appropriate B1 and B2 outputs for the A-input data.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

QFN − RGY

Tape and reel

SN74CBT3257RGYR

CU257

SOIC − D

Tube

SN74CBT3257D

CBT3257

SOIC − D

Tape and reel

SN74CBT3257DR

CBT3257

−40

°C to 85°C

SSOP − DB

Tape and reel

SN74CBT3257DBR

CU257

−40 C to 85 C

SSOP (QSOP) − DBQ

Tape and reel

SN74CBT3257DBQR

CU257

TSSOP − PW

Tube

SN74CBT3257PW

CU257

TSSOP − PW

Tape and reel

SN74CBT3257PWR

CU257

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

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

FUNCTION TABLE

INPUTS

FUNCTION

OE

S

FUNCTION

L

L

A port = B1 port

L

H

A port = B2 port

H

X

Disconnect

Copyright

 2004, 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.