Texas Instruments SN74ALS857DWR, SN74ALS857NT, SNJ54ALS857FK, SNJ54ALS857JT Datasheet

SN54ALS857 . . . JT PACKAGE

SN74ALS857 . . . DW OR NT PACKAGE

(TOP VIEW)

SN54ALS857 . . . 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

S0
1A
1B
1Y
2A
2B
2Y
3A
3B
3Y

OPER = 0

GND

V

CC

S1
6A
6B
6Y
5A
5B
5Y
4A
4B
4Y
COMP

NC – No internal connection

3212827

12 13

5
6
7
8
9
10
11

25
24
23
22
21
20
19

6B
6Y
5A
NC
5B
5Y
4A

1Y
2A
2B

NC

2Y
3A
3B

426

14 15 16 17 18

3Y

OPER = 0

GND

NC

COMP

4Y

4B

1B1AS0

NC

S1

6A

V

CC

SN54ALS857, SN74ALS857

HEX 2-TO-1 UNIVERSAL MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDAS170A – DECEMBER 1982 – REVISED JANUARY 1995

Copyright  1995, Texas Instruments Incorporated

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• Select True or Complementary Data

• Perform AND/NAND (Masking) of

A or B Operand

• Cascadable to Expand Number of

Operands

• Detect Zeros on A or B Operands

• 3-State Outputs Interface Directly With

System Bus

• Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic
(NT) and Ceramic (JT) 300-mil DIPs

description

The ′ALS857 are hextuple 2-line to 1-line
multiplexers with 3-state outputs. The devices can
provide either true (COMP low) or inverted
(COMP high) data at the Y outputs. In addition, the
′ALS857 perform the logical AND function (A • B)
and the clear function as well. The four modes of
operation are:

• Select A-data inputs

• Select B-data inputs

• AND A inputs with B inputs

• Clear

In either of the first two modes, OPER = 0 is high
if all the selected A or B inputs are low. The six Y
outputs and the OPER = 0 output are all 3-state
and rated at 12-mA and 24-mA I

OL

for the
SN54ALS857 and SN74ALS857, respectively . All
outputs can be placed in the high-impedance state
by applying a high level to the COMP, S0, and S1
inputs simultaneously .

The SN54ALS857 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74ALS857 is characterized for operation from 0°C to 70°C.

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.

SN54ALS857, SN74ALS857
HEX 2-TO-1 UNIVERSAL MULTIPLEXERS
WITH 3-STATE OUTPUTS

SDAS170A – DECEMBER 1982 – REVISED JANUAR Y 1995

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

FUNCTION TABLE

INPUTS

OUTPUTS

COMP S1 S0 Y OPER = 0

L L L A H = all A inputs L
L L HBH = all B inputs L
L H LA • B Z
L H HL L
H LLAH = all A inputs L
H L HBH = all B inputs L
H H LA • B Z
H H H Z Z

logic symbol

†

0

1

S0

5

2A

6

2B

8

3A

9

3B

16

4A

15

4B

19

5A

18

5B

22

6A

21

6B

1Y

4

G

0
3

1

23

S1

N4

13

COMP

3

3

2

0

2

1A

1

3

1B

2Y

7

3Y

10

4Y

14

5Y

17

6Y

20

OPER = 0

11

EN5

EN6

2

&

MUX

1

≥1

≥1

3

4,5

6

†

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.

SN54ALS857, SN74ALS857

HEX 2-TO-1 UNIVERSAL MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDAS170A – DECEMBER 1982 – REVISED JANUARY 1995

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic diagram (positive logic)

Details of

Four Identical Channels

Not Shown

1

23

13

2

3

5
6
8
9
16
15
19
18

22

21

4

7

20

10

17

14

11

S0

S1

COMP

1A

1B

2A
2B
3A
3B
4A
4B
5A
5B

6A

6B

1Y

2Y

3Y

4Y

5Y

6Y

OPER = 0

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