SN54AS250A, SN74AS250A

1OF16 DATA GENERATORS/MULTIPLEXERS

WITH 3STATE OUTPUTS

SDAS137A − DECEMBER 1983 − REVISED DECEMBER 1994

Copyright

1

POST OFFICE BOX 655303

POST OFFICE BOX 1443

Select 1-of-16 Data Inputs

Boolean Function Generator

Parallel-to-Serial Converter

Data Source Selector

Multiplexing From n Lines to One Line

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic

(NT) and Ceramic (JT) 300-mil DIPs

description

The

′AS250A devices provide full binary decoding

to select 1-of-16 data inputs or use sources as an

input with an inverting W output. The selected

sources

are

buffered

with

symmetrical

propagation delay times. This reduces the

possibility of transients occurring at the output.

A buffered output-enable (OE) input can be used

for n-line to 1-line cascading. Taking OE high

places the output in the high-impedance state. In

the high-impedance state, the output neither loads

nor drives the bus lines significantly.

OE does not affect the internal operations of the

data selector/multiplexer. New data can be set up

while the outputs are disabled.

The SN54AS250A is characterized for operation

over the full military temperature range of − 55

°C

to 125

°C. The SN74AS250A is characterized for

operation from 0

°C to 70°C.

SN54AS250A ...JT PACKAGE

SN74AS250A . . . DW OR NT PACKAGE

(TOP VIEW)

SN54AS250A . . . FK PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

E7

E6

E5

E4

E3

E2

E1

E0

OE

W

D

GND

E8

E9

E10

E11

E12

E13

E14

E15

A

B

C

32 1

13 14

5

6

7

8

9

10

11

E10

E11

E12

NC

E13

E14

E15

E4

E3

E2

NC

E1

E0

OE

4

15 16 17 18

28 27 26

25

24

23

22

21

20

19

12

NC − No internal connection

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.