SN54ALS157A, SN54ALS158
SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158
QUADRUPLE 1 OF 2 DATA SELECTORS/MULTIPLEXERS
•
•
Buffered Inputs and Outputs
Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
SN54ALS157A, SN54ALS158 . . . J PACKAGE
SN74ALS157A, SN74ALS158,
SN74AS157, SN74AS158
. . .
D OR N PACKAGE
(TOP VIEW)
SDAS081C − APRIL 1982 − REVISED DECEMBER 1994
description
These data selectors/multiplexers contain
inverters and drivers to supply full data selection
to the four output gates. A separate strobe (G)
input is provided. A 4-bit word is selected from one
of two sources and is routed to the four outputs.
The
′ALS157A
and SN74AS157 present true
data. The
′ALS158
and SN74AS158 present
inverted data to minimize propagation delay time.
The SN54ALS157A and SN54ALS158 are
characterized for operation over the full military
temperature range of − 55°C to 125°C. The
SN74ALS157A, SN74ALS158, SN74AS157, and
SN74AS158 are characterized for operation from
0°C to 70°C.
A /B
1A
1B
1Y
2A
2B
2Y
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
G
4A
4B
4Y
3A
3B
3Y
SN54ALS157A, SN54ALS158 . . . FK PACKAGE
(TOP VIEW)
1A
A/B
NC
V
CC
3
4
5
6
7
8
1B
1Y
NC
2A
2B
2 1 20 19
18
17
16
15
G
4A
4B
NC
4Y
3A
14
9 10 11 12 13
NC − No internal connection
FUNCTION TABLE
INPUTS
DATA
G
H
L
L
L
L
A /B
X
L
L
H
H
A
X
L
H
X
X
B
X
X
X
L
H
OUTPUT Y
′ALS157A
ALS157A
SN74AS157
L
L
H
L
H
′ALS158
ALS158
SN74AS158
H
H
L
H
L
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.
Copyright
1994, Texas Instruments Incorporated
POST OFFICE BOX 655303
POST OFFICE BOX 1443
•
HOUSTON, TEXAS 77251−1443
•
DALLAS, TEXAS 75265
2Y
GND
NC
3Y
3B
1
SDAS081C − APRIL 1982 − REVISED DECEMBER 1994
SN54ALS157A, SN54ALS158
SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158
QUAD 1 OF 2 DATA SELECTORS/MULTIPLEXERS
logic symbols
†
′ALS157A,
SN74AS157
15
G
A /B
1A
1B
2A
2B
3A
3B
4A
4B
2
3
5
6
11
10
14
13
12
4Y
9
3Y
7
2Y
1
1
1
EN
G1
MUX
4
15
G
A /B
1A
1Y
1B
2A
2B
3A
3B
4A
4B
2
3
5
6
11
10
14
13
12
4Y
9
3Y
7
2Y
1
1
1
′ALS158,
SN74AS158
EN
G1
MUX
4
1Y
† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
SN54ALS157A, SN54ALS158
SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158
QUAD 1 OF 2 DATA SELECTORS/MULTIPLEXERS
SDAS081C − APRIL 1982 − REVISED DECEMBER 1994
logic diagrams (positive logic)
1A
2
′ALS157A
1A
4
1B
3
1Y
1B
2
′ALS158
4
3
1Y
2A
5
7
2A
2Y
2B
5
7
6
2Y
2B
6
3A
11
9
3A
3Y
3B
11
9
10
3Y
3B
10
4A
14
12
4A
4Y
4B
G
A /B
14
12
13
15
1
4Y
4B
G
A /B
13
15
1
SN74AS157
1A
2
4
1B
2A
3
1Y
1B
2A
7
2B
3A
6
2Y
2B
3A
9
3B
10
3Y
3B
1A
2
SN74AS158
4
3
1Y
5
5
7
6
2Y
11
11
9
10
3Y
4A
14
12
4Y
4A
14
12
4Y
4B
G
A /B
13
15
1
4B
G
A /B
13
15
1
Pin numbers shown are for the D, J, and N packages.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
3
SDAS081C − APRIL 1982 − REVISED DECEMBER 1994
SN54ALS157A, SN54ALS158
SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158
QUAD 1 OF 2 DATA SELECTORS/MULTIPLEXERS
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, T
A
: SN54ALS157A, SN54ALS158 . . . . . . . . . . . . . . . −55°C to 125°C
SN74ALS157A, SN74ALS158 . . . . . . . . . . . . . . . . . . 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
SN54ALS157A
SN54ALS158
MIN
VCC
VIH
VIL
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
−55
4.5
2
0.7
−0.4
4
125
0
NOM
5
MAX
5.5
SN74ALS157A
SN74ALS158
MIN
4.5
2
0.8
−0.4
8
70
NOM
5
MAX
5.5
V
V
V
mA
mA
°C
UNIT
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
II
IIH
IIL
IO§
ICC
′ALS157A
′ALS158
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
VCC = 4.5 V
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
II = − 18 mA
IOH = − 0.4 mA
IOL = 4 mA
IOL = 8 mA
VI = 7 V
VI = 2.7 V
VI = 0.4 V
VO = 2.25 V
See Note 1
−20
6
5
SN54ALS157A
SN54ALS158
MIN
VCC − 2
0.25
0.4
0.1
20
−0.1
−112
11
10
−30
6
5
TYP‡
MAX
−1.2
VCC − 2
0.25
0.35
0.4
0.5
0.1
20
−0.1
−112
11
10
V
mA
µA
mA
mA
mA
SN74ALS157A
SN74ALS158
MIN
TYP‡
MAX
−1.2
V
V
UNIT
‡ 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 4.5 V applied to all inputs and all outputs open.
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
SN54ALS157A, SN54ALS158
SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158
QUAD 1 OF 2 DATA SELECTORS/MULTIPLEXERS
SDAS081C − APRIL 1982 − REVISED DECEMBER 1994
switching characteristics (see Figure 1)
VCC = 5 V,
CL = 50 pF,
RL = 500
Ω
,
TA = 25°C
′ALS157A
TYP
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
9
A or B
A/B
G
Y
Y
Y
6
15
9
14
10
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
Ω
,
TA = MIN to MAX†
SN54ALS157A SN74ALS157A
MIN
4
2
7
4
7
4
MAX
17
15
28
20
25
18
MIN
4
2
7
4
7
4
MAX
14
12
24
17
20
13
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
switching characteristics (see Figure 1)
VCC = 5 V,
CL = 50 pF,
RL = 500
Ω
,
TA = 25°C
′ALS158
TYP
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
9
A or B
A/B
G
Y
Y
Y
5
13
13
13
13
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
Ω
,
TA = MIN to MAX†
SN54ALS158
SN74ALS158
MIN
4
2
5
5
5
5
MAX
18
12
22
22
22
22
MIN
4
2
5
5
5
5
MAX
15
8
18
18
18
18
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
