Texas Instruments SN74ALS157AN Handleiding

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SDAS081C − APRIL 1982 − REVISED DECEMBER 1994

Copyright  1994, Texas Instruments Incorporated

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

•Buffered Inputs and Outputs

•Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

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

Ceramic (J) 300-mil DIPs

description

These data selectors/multiplexers contain

inverters and drivers to supply full data selection

to the four output gates. A separate strobe (G)

input is provided. A 4-bit word is selected from one

of two sources and is routed to the four outputs.

The ′ALS157A and SN74AS157 present true

data. The ′ALS158 and SN74AS158 present

inverted data to minimize propagation delay time.

The SN54ALS157A and SN54ALS158 are

characterized for operation over the full military

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

SN74ALS157A, SN74ALS158, SN74AS157, and

SN74AS158 are characterized for operation from

0 C.°C to 70°

FUNCTION TABLE

INPUTSOUTPUT Y

G

A /B

DATA ′

ALS157A

′

ALS158

GA /BA B

ALS157A

SN74AS157

ALS158

SN74AS158

H X XXLH

LLL XLH

LLH XHL

LHH XLL

LH X HHL

SN54ALS157A, SN54ALS158 . . . J PACKAGE

SN74ALS157A, SN74ALS158,

SN74AS157, SN74AS158 ...D OR N PACKAGE

(TOP VIEW)

32120 19

91011 1213

4

5

6

7

8

18

17

16

15

14

4A

4B

NC

4Y

3A

1B

1Y

NC

2A

2B

SN54ALS157A, SN54ALS158 . . . FK PACKAGE

(TOP VIEW)

1A

A/B

NC

3Y

3B G

2Y

GND

NC V

CC

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

VCC

G

4A

4B

4Y

3A

3B

3Y

NC − No internal connection

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