SN54ALS857, SN74ALS857
HEX 2-TO-1 UNIVERSAL MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS170A – DECEMBER 1982 – REVISED JANUARY 1995
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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
SN54ALS857 . . . JT PACKAGE
SN74ALS857 . . . DW OR NT PACKAGE
(TOP VIEW)
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
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B)
and the clear function as well. The four modes of
operation are:
S0
1A
1B
1Y
2A
2B
2Y
3A
3B
3Y
OPER = 0
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
S1
6A
6B
6Y
5A
5B
5Y
4A
4B
4Y
COMP
SN54ALS857 . . . FK PACKAGE
(TOP VIEW)
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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.
1Y
2A
2B
NC
2Y
3A
3B
1B
1A
S0
NC
V
CC
S1
6A
4
5
6
7
8
9
10
3 2 1 28 27 26
25
24
23
22
21
20
19
11
12 13 14 15 16 17 18
6B
6Y
5A
NC
5B
5Y
4A
NC – No internal connection
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.
POST OFFICE BOX 655303
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DALLAS, TEXAS 75265
3Y
OPER = 0
GND
NC
COMP
4Y
4B
Copyright
©
1995, Texas Instruments Incorporated
1
TI [ TEXAS INSTRUMENTS ]
