Page 1
74ALS157/74ALS158
Data selector/multiplexer
Product specification
IC05 Data Handbook
1991 Feb 08
INTEGRATED CIRCUITS
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
2
1991 Feb 08 853–1 129 01670
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
) is active when Low. When E is High,
all of the outputs (Yn) are forced Low regardless of all other input
conditions.
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).
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS157 6.0ns 6mA
74ALS158 6.0ns 6mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION COMMERCIAL RANGE
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
DRAWING
NUMBER
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
LOAD VALUE
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.
PIN CONFIGURATION – 74ALS157
16
15
14
13
12
11
107
6
5
4
3
2
1
Yb
V
CC
Yd
I0c
I1c
I1d
E
I0d
S
I0a
I1b
I1a
Ya
I0b
98GND Yc
SC00051
PIN CONFIGURATION – 74ALS158
16
15
14
13
12
11
107
6
5
4
3
2
1
Y
b
V
CC
Yd
I0c
I1c
I1d
E
I0d
S
I0a
I1b
I1a
Y
a
I0b
98GND Yc
SC00052
LOGIC SYMBOL – 74ALS157
VCC = Pin 16
GND = Pin 8
SC00053
1
15
S
E
2356111014
I0a I1a I0b I1b I0c I1c I0d
Ya Yb Yc Yd
47912
13
I1d
LOGIC SYMBOL – 74ALS158
VCC = Pin 16
GND = Pin 8
SC00054
1
15
S
E
2356111014
I0a I1a I0b I1b I0c I1c I0d
Ya Yb Yc Yd
47912
13
I1d
Page 3
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
1991 Feb 08
3
IEC/IEEE SYMBOL – 74ALS157
SC00055
2
1
1
G1
15
EN
3
4
1
MUX
5
6
7
11
10
9
14
13
12
IEC/IEEE SYMBOL – 74ALS158
SC00056
2
1
1
G1
15
EN
3
4
1
MUX
5
6
7
11
10
9
14
13
12
LOGIC DIAGRAM – 74ALS157
VCC = Pin 16
GND = Pin 8
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
SC00057
LOGIC DIAGRAM – 74ALS158
VCC = Pin 16
GND = Pin 8
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
SC00058
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
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
Page 4
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
1991 Feb 08
4
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
PARAMETER RATING UNIT
V
CC
Supply voltage –0.5 to +7.0 V
V
IN
Input voltage –0.5 to +7.0 V
I
IN
Input current –30 to +5 mA
V
OUT
Voltage applied to output in High output state –0.5 to V
CC
V
I
OUT
Current applied to output in Low output state 16 mA
T
amb
Operating free-air temperature range 0 to +70 °C
T
stg
Storage temperature range –65 to +150 ° C
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5.0 5.5 V
V
IH
High-level input voltage 2.0 V
V
IL
Low-level input voltage 0.8 V
I
Ik
Input clamp current –18 mA
I
OH
High-level output current –0.4 mA
I
OL
Low-level output current 8 mA
T
amb
Operating free-air temperature range 0 +70 °C
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN TYP2MAX
UNIT
V
OH
High-level output voltage
VCC = ±10%, VIL = MAX,
V
IH
= MIN
IOH = MAX V
CC
– 2 V
p
VCC = MIN, VIL = MAX,
I
OL
= 4mA 0.25 0.40 V
VOLLow-level output voltage
CC
,
IL
,
VIH = MIN
I
OL
= 8mA 0.35 0.50 V
V
IK
Input clamp voltage VCC = MIN, II = I
IK
–0.73 –1.5 V
I
I
Input current at minimum input voltage VCC = MAX, VI = 7.0V 0.1 mA
I
IH
High-level input current VCC = MAX, VI = 2.7V 20 µA
I
IL
Low-level input current VCC = MAX, VI = 0.4V –0.1 mA
I
O
Output current
3
VCC = MAX, VO = 2.25V –30 –112 mA
pp
74ALS157
6 11 mA
ICCSupply current (total)
74ALS158
V
CC
=
MAX
6 10 mA
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
CC
= 5V, T
amb
= 25°C.
3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS
.
Page 5
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
1991 Feb 08
5
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL PARAMETER TEST CONDITION
T
amb
= 0°C to +70°C
V
CC
= +5.0V ± 10%
C
L
= 50pF, RL = 500Ω
UNIT
MIN MAX
t
PLH
t
PHL
Propagation delay
I0n or I1n to Yn
Waveform 1
2.0
2.0
9.0
9.0
ns
t
PLH
t
PHL
Propagation delay
S to Yn
74ALS157
Waveform 1, 3
4.0
4.0
12.0
12.0
ns
t
PLH
t
PHL
Propagation delay
E
to Yn
Waveform 3
4.0
7.0
11.0
14.0
ns
t
PLH
t
PHL
Propagation delay
I0n or I1n to Y
n
Waveform 2
2.0
2.0
8.0
8.0
ns
t
PLH
t
PHL
Propagation delay
S to Y
n
74ALS158
Waveform 2, 4
4.0
4.0
12.0
12.0
ns
t
PLH
t
PHL
Propagation delay
E
to Yn
Waveform 4
4.0
4.0
14.0
14.0
ns
AC WAVEFORMS
For all waveforms, VM = 1.3V .
V
M
V
M
V
M
V
M
t
PHL
t
PLH
I0n, I1n, S
Yn, Y
n
SC00059
Waveform 1. Propagation Delay for Data and Select to Output
V
M
V
M
V
M
V
M
t
PLH
t
PHL
I0n, I1n, S
Yn, Y
n
SC00060
Waveform 2. Propagation Delay for Data and Select to Output
V
M
V
M
V
M
V
M
t
PHL
t
PLH
E, S
Yn, Y
n
SC00061
Waveform 3. Propagation Delay for Enable and
Select to Output
V
M
V
M
V
M
V
M
t
PLH
t
PHL
E, S
Yn, Y
n
SC00062
Waveform 4. Propagation Delay for Enable and
Select to Output
Page 6
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
1991 Feb 08
6
TEST CIRCUIT AND WAVEFORMS
t
w
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
NEGATIVE
PULSE
POSITIVE
PULSE
t
w
AMP (V)
0.3V
0.3V
t
THL (tf
f
)
INPUT PULSE REQUIREMENTS
Rep.Rate
t
w
t
TLHtTHL
1MHz
500ns
2.0ns 2.0ns
Input Pulse Definition
V
CC
Family
74ALS
D.U.T.
PULSE
GENERATOR
R
L
C
L
R
T
V
IN
V
OUT
Test Circuit for Totem-pole Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
CL= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
t
THL (tf
)
t
TLH (tr
)
t
TLH (tr
)
AMP (V)
Amplitude
3.5V
1.3V
V
M
SC00005
Page 7
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
1991 Feb 08
7
DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
Page 8
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
1991 Feb 08
8
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
Page 9
Philips Semiconductors Product specification
74ALS157/74ALS158Data selector/multiplexer
1991 Feb 08
9
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.
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.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
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 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.
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