Texas Instruments SN74AS250ADW, SN74AS250ADWR, SN74AS250ANT, SN74AS250ANT3, SNJ54AS250AJT Datasheet

SN54AS250A, SN74AS250A

1-OF-16 DATA GENERATORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994

• 4-Line to 1-Line Multiplexers That Can

Select 1-of-16 Data Inputs

• Applications:

Boolean Function Generator
Parallel-to-Serial Converter
Data Source Selector

• Buffered 3-State Bus Driver Inputs Permit

Multiplexing From n Lines to One Line

• Package Options Include Plastic

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
sources are buffered with symmetrical
propagation delay times. This reduces the
possibility of transients occurring at the output.

A buffered output-enable (OE
for n-line to 1-line cascading. Taking OE
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.

output. The selected

) input can be used

high

SN54AS250A ...JT PACKAGE

SN74AS250A . . . DW OR NT PACKAGE

SN54AS250A . . . FK PACKAGE

E4
E3
E2

NC

E1
E0

OE

NC – No internal connection

E7
E6
E5
E4
E3
E2
E1
E0

OE

W

GND

4

5
6
7
8
9

10

11

12

(TOP VIEW)

1
2
3
4
5
6
7
8
9
10

D

11
12

(TOP VIEW)

E5E6E7

321

13 14

D

W

24
23
22
21
20
19
18
17
16
15
14
13

CC

VE8E9

NC

28 27 26

15 16 17 18

C

NC

GND

V
E8
E9
E10
E1 1
E12
E13
E14
E15
A
B
C

B

CC

E10

25

E1 1

24
23

E12

22

NC

21

E13

20

E14

19

E15

A

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1994, Texas Instruments Incorporated

1

†

SN54AS250A, SN74AS250A
1-OF-16 DATA GENERATORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS

SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994

FUNCTION TABLE

INPUTS

OE A B C D Ei

L L L L L E0 E0
L H LLLE1 E1
LLHLLE2 E2
LHHLLE3 E3
LLLHLE4 E4
LHLHLE5 E5
LLHHLE6 E6
LHHHLE7 E7
LLLLHE8 E8
LHLLHE9 E9
LLH L H E10 E10
L H HLHE11E11
L L L H H E12 E12
L H L H H E13 E13
L L H H H E14 E14
L H H H H E15 E15

H X X X X X Z

OUTPUT

W

logic symbol

9

OE

15

A

14

B

13

C

11

D

8

E0

7

E1

6

E2

5

E3

4

E4

3

E5

2

E6

1

E7

23

E8

22

E9

21

E10

20

E11

19

E12

18

E13

17

E14

16

E15

EN
0

3

G

MUX

0

15

10

W

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.

Pin numbers shown are for the DW, JT, and NT packages.

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic diagram (positive logic)

8

E0

7

E1

6

E2

5

E3

4

E4

3

E5

2

E6

1

Data

Inputs

E7

E8

23

SN54AS250A, SN74AS250A

1-OF-16 DATA GENERATORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994

10

W

Data

Selects

E9

E10

E11

E12

E13

E14

E15

22

21

20

19

18

17

16

15

A

14

B

13

C

11

D

A

A

B

B

C

C

D

D

OE

Pin numbers shown are for the DW, JT, and NT packages.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3