Fairchild DM74ALS157SJ Quad 1-of-2 line data selector/multiplexer Datasheet

Revised February 2000
DM74ALS157 • DM74ALS158
Quad 1-of-2 Line Data Selector/Multiplexer
General Description
Features
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four output gates. A separate strobe input is provided. A 4-bit word
is selected from one of two sources and is routed to the
four outputs. The ALS157 presents true data whereas the
ALS158 presents inverted data to minimize propagation
delay time.
■ Switching specifications at 50 pF
■ Switching specifications guaranteed over full temperature and VCC range
■ Advanced oxide-isolated, ion-implanted Schottky TTL
process
■ Functionally and pin for pin compatible with Schottky
and low power Schottky TTL counterpart
■ Improved AC performance over Schottky and low power
Schottky counterparts
■ Expand any data input point
■ Multiplex dual data buses
■ General four functions of two variables (one variable is
common)
■ Source programmable counters
Ordering Code:
Order Number
Package Number
Package Description
DM74ALS157M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74ALS157SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS157N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74ALS158N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Inputs
Strobe Select
Output Y
A
B
DM74ALS157 DM74ALS158
H
X
X
X
L
H
L
L
L
X
L
H
L
L
H
X
H
L
L
H
X
L
L
H
L
H
X
H
H
L
H = HIGH Level
L = LOW Level
X = Don't Care
© 2000 Fairchild Semiconductor Corporation
DS006205
www.fairchildsemi.com
DM74ALS157 • DM74ALS158 Quad 1-of-2 Line Data Selector/Multiplexer
April 1984
DM74ALS157 • DM74ALS158
Logic Diagrams
DM74ALS157
DM74ALS158
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2
Supply Voltage
7V
Input Voltage
7V
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
0°C to +70°C
Operating Free Air Temperature Range
−65°C to +150°C
Storage Temperature Range
Recommended Operating Conditions
Symbol
Parameter
Min
Nom
Max
Units
4.5
5
5.5
V
LOW Level Input Voltage
0.8
V
VCC
Supply Voltage
VIH
HIGH Level Input Voltage
VIL
2
V
IOH
HIGH Level Output Current
−0.4
mA
IOL
LOW Level Output Current
8
mA
TA
Free Air Operating Temperature
70
°C
0
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.
Symbol
Parameter
Conditions
VIK
Input Clamp Voltage
VCC = 4.5V, II = −18 mA
VOH
HIGH Level Output Voltage
IOH = −0.4 mA, VCC = 4.5V to 5.5V
VOL
LOW Level
VCC = 4.5V
Output Voltage
II
Input Current @ Maximum
Input Voltage
Min
Typ
Max
Units
−1.2
V
V
VCC − 2
V
IOL = 4 mA
0.25
0.4
IOL = 8 mA
0.35
0.5
V
0.1
mA
VCC = 5.5V, VIH = 7V
IIH
HIGH Level Input Current
VCC = 5.5V, VIH = 2.7V
20
µA
IIL
LOW Level Input Current
VCC = 5.5V, VIL = 0.4V
−0.1
mA
IO
Output Drive Current
VCC = 5.5V
VO = 2.25V
−112
mA
ICC
Supply Current
VCC = 5.5V
DM74ALS157
6
11
mA
All Inputs = 4.5V
DM74ALS158
5
10
mA
−30
Switching Characteristics
over recommended operating free air temperature range.
From (Input)
Symbol
Parameter
To (Output)
tPLH
tPHL
Propagation Delay Time
Data to Y
Conditions
VCC = 4.5V to 5.5V
LOW-to-HIGH Level Output
CL = 50 pF
Propagation Delay Time
RL = 500Ω
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time
Strobe to Y
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time
Select to Y
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
HIGH-to-LOW Level Output
3
DM74ALS157
DM74ALS158
Min
Max
Min
Max
3
14
3
15
ns
2
12
1
8
ns
6
20
5
18
ns
4
13
5
18
ns
7
24
5
19
ns
4
14
5
18
ns
Units
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DM74ALS157 • DM74ALS158
Absolute Maximum Ratings(Note 1)
DM74ALS157 • DM74ALS158
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
Package Number M16A
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4
DM74ALS157 • DM74ALS158
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
5
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DM74ALS157 • DM74ALS158 Quad 1-of-2 Line Data Selector/Multiplexer
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
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