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
3 2 1 28 27
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
4
26
14 15 16 17 18
3Y
OPER = 0
GND
NC
COMP
4Y
4B
1B
1A
S0
NC
S1
6A
V
C
C
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 JANUARY 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
H
B
H = all B inputs L
L
H
L
A
B
Z
L
H
H
L
L
H
L
L
A
H = all A inputs L
H
L
H
B
H = all B inputs L
H
H
L
A
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.
SN54ALS857, SN74ALS857
HEX 2-TO-1 UNIVERSAL MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS170A DECEMBER 1982 REVISED JANUARY 1995
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54ALS857
55
C to 125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS857
0
C to 70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54ALS857
SN74ALS857
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.7
0.8
V
IOH
High-level output current
1
2.6
mA
IOL
Low-level output current
12
24
mA
TA
Operating free-air temperature
55
125
0
70
C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS857
SN74ALS857
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.5
1.5
V
VCC = 4.5 V to 5.5 V,
IOH = 0.4 mA
VCC 2
VCC 2
VOH
VCC = 4 5 V
IOH = 1 mA
2.4
3.3
V
VCC = 4.5 V
IOH = 2.6 mA
2.4
3.2
VOL
VCC = 4 5 V
IOL = 12 mA
0.25
0.4
0.25
0.4
V
VOL
VCC = 4.5 V
IOL = 24 mA
0.35
0.5
V
IOZH
VCC = 5.5 V,
VO = 2.7 V
20
20
A
IOZL
VCC = 5.5 V,
VO = 0.4 V
20
20
A
II
VCC = 5.5 V,
VI = 7 V
0.1
0.1
mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
20
A
IIL
VCC = 5.5 V,
VI = 0.4 V
0.2
0.2
mA
IO
VCC = 5.5 V,
VO = 2.25 V
15
70
15
70
mA
V
5 5 V
Outputs high
11
24
11
24
ICC
VCC = 5.5 V,
See Note 1
Outputs low
16
33
16
33
mA
See Note 1
Outputs disabled
18
36
18
36
All typical values are at VCC = 5 V, TA = 25
C.
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
NOTE 1: ICC is measured with all possible inputs grounded while achieving the stated output conditions.
SN54ALS857, SN74ALS857
HEX 2-TO-1 UNIVERSAL MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS170A DECEMBER 1982 REVISED JANUARY 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
,
R2 = 500
,
TA = MIN to MAX
UNIT
SN54ALS857
SN74ALS857
MIN
MAX
MIN
MAX
A or B (COMP high)
Y (inverting)
2
35
4
25
A or B (COMP low)
Y (noninverting)
2
27
4
18
tpd
S0 or S1
Y
2
37
7
33
ns
tpd
COMP
Y
2
26
6
18
ns
A or B
OPER
0
2
45
5
37
S0 to S1
OPER = 0
2
30
5
23
ten
S0 to S1
Y
2
38
7
35
ns
tdis
S0 to S1
Y
2
43
2
23
ns
ten
COMP
Y
2
37
8
24
ns
tdis
COMP
Y
2
45
6
21
ns
ten
S0
OPER
0
2
29
6
20
ns
tdis
S0
OPER = 0
2
42
11
27
ns
ten
S1
OPER
0
2
28
6
25
ns
tdis
S1
OPER = 0
2
37
3
19
ns
ten
COMP
OPER
0
2
43
9
25
ns
tdis
COMP
OPER = 0
2
36
6
20
ns
tpd = tPLH or tPHL, ten = tPZH or tPZL, tdis = tPHZ or tPLZ
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
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