SN54AHC257, SN74AHC257

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCLS349C – MAY 1996 – REVISED JULY 1998

1

POST OFFICE BOX 655303

CMOS) Process

Small-Outline (D), Shrink Small-Outline

(DB), Thin Very Small-Outline (DGV), Thin

Shrink Small-Outline (PW), and Ceramic

Flat (W) Packages, Ceramic Chip Carriers

(FK), and Standard Plastic (N) and Ceramic

(J) DIPs

description

These

quadruple

2-line

to

1-line

data

selectors/multiplexers are designed for 2-V to

The ’AHC257 devices are designed to multiplex

signals from 4-bit data sources to 4-output data

lines in bus-organized systems. The 3-state

outputs do not load the data lines when the

output-enable (OE) input is at a high logic level.

To ensure the high-impedance state during power

through a pullup resistor; the minimum value of

the resistor is determined by the current-sinking

capability of the driver.

The SN54AHC257 is characterized for operation

over the full military temperature range of –55

°C

to 125

°C. The SN74AHC257 is characterized for

operation from –40

°C to 85°C.

FUNCTION TABLE

INPUTS

OUTPUT

OE

A/B

A

B

Y

H

X

X

X

Z

L

LL

X

L

L

LH

X

H

L

HX

L

L

L

H

X

H

H

Copyright

© 1998, Texas Instruments Incorporated

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.

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.

EPIC is a trademark of Texas Instruments Incorporated.

SN54AHC257 ...J OR W PACKAGE

SN74AHC257 . . . D, DB, DGV, N, OR PW PACKAGE

(TOP VIEW)

SN54AHC257 . . . FK PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A/B

1A

1B

1Y

2A

2B

2Y

GND

OE

4A

4B

4Y

3A

3B

3Y

32 1 20 19

910 11 1213

4

5

6

7

8

18

17

16

15

14

4A

4B

NC

4Y

3A

1B

1Y

NC

2A

2B

NC – No internal connection