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DM74ALS157N

P1-P3P4-P6
© 2000 Fairchild Semiconductor Corporation DS006205 www.fairchildsemi.com
April 1984
Revised February 2000
DM74ALS157 • DM74ALS158 Quad 1-of-2 Line Data Selector/Multiplexer
DM74ALS157 • DM74ALS158
Quad 1-of-2 Line Data Selector/Multiplexer
General Description
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four out-
put 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.
Features
■ Switching specifications at 50 pF
■ Switching specifications guaranteed over full tempera-
ture and V
CC
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:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Function Table
H = HIGH Level
L = LOW Level
X = Don't Care
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
Inputs Output Y
Strobe Select A B DM74ALS157 DM74ALS158
HXXX L H
LLLX L H
LLHX H L
LHXL L H
LHXH H L
www.fairchildsemi.com 2
DM74ALS157 • DM74ALS158
Logic Diagrams
DM74ALS157
DM74ALS158
3 www.fairchildsemi.com
DM74ALS157 • DM74ALS158
Absolute Maximum Ratings(Note 1)
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.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at V
CC
= 5V, T
A
= 25°C.
Switching Characteristics
over recommended operating free air temperature range.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.5 5 5.5 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current −0.4 mA
I
OL
LOW Level Output Current 8 mA
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
V
IK
Input Clamp Voltage V
CC
= 4.5V, I
I
= −18 mA −1.2 V
V
OH
HIGH Level Output Voltage I
OH
= −0.4 mA, V
CC
= 4.5V to 5.5V V
CC
− 2V
V
OL
LOW Level V
CC
= 4.5V I
OL
= 4 mA 0.25 0.4 V
Output Voltage I
OL
= 8 mA 0.35 0.5 V
I
I
Input Current @ Maximum
V
CC
= 5.5V, V
IH
= 7V 0.1 mA
Input Voltage
I
IH
HIGH Level Input Current V
CC
= 5.5V, V
IH
= 2.7V 20 µA
I
IL
LOW Level Input Current V
CC
= 5.5V, V
IL
= 0.4V −0.1 mA
I
O
Output Drive Current V
CC
= 5.5V V
O
= 2.25V −30 −112 mA
I
CC
Supply Current V
CC
= 5.5V DM74ALS157 6 11 mA
All Inputs = 4.5V DM74ALS158 5 10 mA
Symbol Parameter
From (Input)
Conditions
DM74ALS157 DM74ALS158
Units
To (Output) Min Max Min Max
t
PLH
Propagation Delay Time Data to Y V
CC
= 4.5V to 5.5V
3 14 3 15 ns
LOW-to-HIGH Level Output C
L
= 50 pF
t
PHL
Propagation Delay Time R
L
= 500Ω
2121 8ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time Strobe to Y
6 20 5 18 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
4 13 5 18 ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time Select to Y
7 24 5 19 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
4 14 5 18 ns
HIGH-to-LOW Level Output
P1-P3P4-P6

DM74ALS157N

Mfr. #:
Buy DM74ALS157N
Manufacturer:
ON Semiconductor / Fairchild
Description:
Encoders, Decoders, Multiplexers & Demultiplexers Qd 1-of-2 Dt Sel/Mul
Lifecycle:
New from this manufacturer.
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