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INTEGRATED CIRCUITS
74ALS157/74ALS158
Data selector/multiplexer
Product specification
IC05 Data Handbook
1991 Feb 08
Page 2
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
74ALS157 Quad 2-input data selector/multiplexer, non-inverting
74ALS158 Quad 2-input data selector/multiplexer, inverting
DESCRIPTION
The 74ALS157 is a quad 2-input multiplexer which selects 4 bits of
data from one of two sources under the control of a common select
input (S). The enable input (E
all of the outputs (Yn) are forced Low regardless of all other input
conditions.
) is active when Low. When E is High,
TYPE
74ALS157 6.0ns 6mA
74ALS158 6.0ns 6mA
TYPICAL
PROPAGATION DELAY
SUPPLY CURRENT
Moving data from two registers to a common output bus is a typical
use of the 74ALS157. The state of the select input determines the
particular register from which data comes.
The device is the logic implementation of 4-pole, 2-position switch
where the position of the switch is determined by the logic levels
supplied to the select input. The 74ALS158 is similar but has
inverting outputs (Y
n).
ORDERING INFORMATION
ORDER CODE
DESCRIPTION COMMERCIAL RANGE
V
= 5V ±10%,
CC
T
= 0°C to +70°C
amb
16-pin plastic DIP 74ALS157N, 74ALS158N SOT38-4
16-pin plastic SO 74ALS157D, 74ALS158D SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
74ALS (U.L.)
HIGH/LOW
Ina, Inb, Inc, Ind Data inputs 1.0/1.0 20µA/0.1mA
S Select input 1.0/1.0 20µA/0.1mA
E Enable input 1.0/1.0 20µA/0.1mA
Ya – Yd, Ya – Yd Data outputs 20/240 0.4mA/24mA
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOAD VALUE
HIGH/LOW
TYPICAL
(TOTAL)
DRAWING
NUMBER
PIN CONFIGURATION – 74ALS157
I0a
I1a
I0b
I1b
S
1
2
3
Ya
4
5
6
Yb
16
15
14
13
12
11
107
98GND Yc
LOGIC SYMBOL – 74ALS157
2356111014
I0a I1a I0b I1b I0c I1c I0d
1
15
VCC = Pin 16
GND = Pin 8
S
E
Ya Yb Yc Yd
47912
V
E
I0d
I1d
Yd
I0c
I1c
PIN CONFIGURATION – 74ALS158
S
I0a
I1a
I0b
I1b
1
2
3
Y
4
a
5
6
b
Y
CC
SC00051
16
15
14
13
12
11
107
98GND Yc
V
E
I0d
I1d
Yd
I0c
I1c
CC
SC00052
LOGIC SYMBOL – 74ALS158
I1d
13
1
15
VCC = Pin 16
SC00053
GND = Pin 8
2356111014
I0a I1a I0b I1b I0c I1c I0d
S
E
Ya Yb Yc Yd
47912
13
I1d
SC00054
1991 Feb 08 853–1 129 01670
2
Page 3
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
IEC/IEEE SYMBOL – 74ALS157
1
15
2
3
5
6
11
10
14
13
G1
EN
1
1
MUX
LOGIC DIAGRAM – 74ALS157
E I0a I1a I0b I1b I0c I1c I0d I0d S
15 2 3 5 6 11 10 14 13 1
IEC/IEEE SYMBOL – 74ALS158
1
15
4
7
9
12
SC00055
2
3
5
6
11
10
14
13
G1
EN
1
1
MUX
4
7
9
12
SC00056
LOGIC DIAGRAM – 74ALS158
E I0a I1a I0b I1b I0c I1c I0d I0d S
15 2 3 5 6 11 10 14 13 1
47 912
Ya Yb Yc Yd
VCC = Pin 16
GND = Pin 8
FUNCTION T ABLE – 74ALS157
INPUTS OUTPUTS
E S I0n I1n Yn
H X X X L
L L L X L
L L H X H
L H X L L
L H X H H
H = High voltage level
L = Low voltage level
X = Don’t care
SC00057
47 912
Ya Yb Yc Yd
VCC = Pin 16
GND = Pin 8
FUNCTION T ABLE – 74ALS158
INPUTS OUTPUTS
E S I0n I1n Yn
H X X X H
L L L X H
L L H X L
L H X L H
L H X H L
H = High voltage level
L = Low voltage level
X = Don’t care
SC00058
1991 Feb 08
3
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Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
UNIT
VOLLow-level output voltage
CC
,
IL
,
ICCSupply current (total)
V
MAX
74ALS157/74ALS158Data selector/multiplexer
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
V
T
V
V
I
OUT
I
OUT
amb
T
CC
IN
stg
Supply voltage –0.5 to +7.0 V
Input voltage –0.5 to +7.0 V
IN
Input current –30 to +5 mA
Voltage applied to output in High output state –0.5 to V
Current applied to output in Low output state 16 mA
Operating free-air temperature range 0 to +70 °C
Storage temperature range –65 to +150 °C
RECOMMENDED OPERATING CONDITIONS
T
V
V
I
CC
V
I
OH
I
OL
amb
Supply voltage 4.5 5.0 5.5 V
High-level input voltage 2.0 V
IH
Low-level input voltage 0.8 V
IL
Input clamp current –18 mA
Ik
High-level output current –0.4 mA
Low-level output current 8 mA
Operating free-air temperature range 0 +70 °C
PARAMETER RATING UNIT
CC
V
LIMITS
MIN NOM MAX
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
MIN TYP2MAX
V
OH
High-level output voltage
p
V
I
I
IH
I
I
Input clamp voltage VCC = MIN, II = I
IK
Input current at minimum input voltage VCC = MAX, VI = 7.0V 0.1 mA
I
High-level input current VCC = MAX, VI = 2.7V 20 µA
Low-level input current VCC = MAX, VI = 0.4V –0.1 mA
IL
O
Output current
pp
3
74ALS157
74ALS158
VCC = ±10%, VIL = MAX,
V
= MIN
IH
VCC = MIN, VIL = MAX,
VIH = MIN
IK
IOH = MAX V
I
= 4mA 0.25 0.40 V
OL
I
= 8mA 0.35 0.50 V
OL
VCC = MAX, VO = 2.25V –30 –112 mA
=
CC
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
= 5V, T
CC
amb
= 25°C.
– 2 V
CC
–0.73 –1.5 V
6 11 mA
6 10 mA
OS
.
1991 Feb 08
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Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
= 0°C to +70°C
amb
V
SYMBOL PARAMETER TEST CONDITION
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation delay
I0n or I1n to Yn
Propagation delay
S to Yn
Propagation delay
E
to Yn
Propagation delay
I0n or I1n to Y
n
Propagation delay
S to Y
n
Propagation delay
E
to Yn
74ALS157
74ALS158
Waveform 1
Waveform 1, 3
Waveform 3
Waveform 2
Waveform 2, 4
Waveform 4
= +5.0V ± 10%
CC
C
= 50pF, RL = 500Ω
L
MIN MAX
2.0
2.0
4.0
4.0
4.0
7.0
2.0
2.0
4.0
4.0
4.0
4.0
9.0
9.0
12.0
12.0
11.0
14.0
8.0
8.0
12.0
12.0
14.0
14.0
UNIT
ns
ns
ns
ns
ns
ns
AC WAVEFORMS
For all waveforms, VM = 1.3V.
I0n, I1n, S
Yn, Y
n
Waveform 1. Propagation Delay for Data and Select to Output
E, S
Yn, Y
n
Waveform 3. Propagation Delay for Enable and
V
M
t
PLH
V
M
V
M
t
PLH
V
M
Select to Output
V
M
t
PHL
V
M
SC00059
V
M
t
PHL
V
M
SC00061
I0n, I1n, S
Yn, Y
n
V
M
t
PHL
V
M
t
PLH
V
V
M
M
SC00060
Waveform 2. Propagation Delay for Data and Select to Output
Yn, Y
E, S
n
V
M
t
PHL
V
M
t
PLH
V
V
M
M
SC00062
Waveform 4. Propagation Delay for Enable and
Select to Output
1991 Feb 08
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Page 6
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
TEST CIRCUIT AND WAVEFORMS
V
CC
PULSE
GENERATOR
V
IN
R
T
D.U.T.
V
OUT
C
R
L
L
Test Circuit for Totem-pole Outputs
DEFINITIONS:
R
= Load resistor;
L
see AC electrical characteristics for value.
CL= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
= Termination resistance should be equal to Z
T
pulse generators.
OUT
of
NEGATIVE
PULSE
POSITIVE
PULSE
90%
10%
Family
74ALS
V
M
10%
t
THL (tf
t
TLH (tr
90%
V
M
Input Pulse Definition
Amplitude
3.5V
t
w
10%
)
f
)
t
)
TLH (tr
t
)
THL (tf
90%
t
w
90%
V
M
V
M
10%
INPUT PULSE REQUIREMENTS
V
M
1.3V
Rep.Rate
1MHz
500ns
t
w
t
TLHtTHL
2.0ns 2.0ns
AMP (V)
0.3V
AMP (V)
0.3V
SC00005
1991 Feb 08
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Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
1991 Feb 08
7
Page 8
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
1991 Feb 08
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Page 9
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
LIFE SUPPORT APPLICA TIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
1991 Feb 08
9
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