Integral IN74LS157N Quad 2-input data selector/multiplexer Datasheet

TECHNICAL DATA
IN74LS157
Quad 2-Input Data Selector/Multiplexer
This monolitic data selector/multiplexer contains 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 LS157 has the same
functions and pin connections as the LS257 but the latter is provided
with 3-state outputs.
• Buffered Inputs and Outputs
• Common Strobe/Select input for all 4 circuits
ORDERING INFORMATION
IN74LS157N Plastic
IN74LS157D SOIC
TA =0° to 70° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
PIN 16 =VCC
PIN 8 = GND
Outputs
Output
Enable
Select
Y0-Y3
H
X
L
L
L
A0-A3
L
H
B0-B3
X=don’t care
A0-A3,B0-B3=the levels of the respective
Data-Word Inputs
1
IN74LS157
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
Supply Voltage
7.0
V
VIN
Input Voltage
7.0
V
VOUT
Output Voltage
5.5
V
Tstg
Storage Temperature Range
-65 to +150
°C
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
5.25
V
VCC
Supply Voltage
4.75
VIH
High Level Input Voltage
2.0
VIL
Low Level Input Voltage
0.8
V
IOH
High Level Output Current
-0.4
mA
IOL
Low Level Output Current
8.0
mA
TA
Ambient Temperature Range
+70
°C
0
V
DC ELECTRICAL CHARACTERISTICS over full operating conditions
Guaranteed Limit
Symbol
Parameter
Test Conditions
Min
Max
Unit
-1.5
V
VIK
Input Clamp Voltage
VCC = min, IIN = -18 mA
VOH
High Level Output Voltage
VCC = min, IOH = -0.4 mA
VOL
Low Level Output Voltage
VCC = min, IOL = 4 mA
0.4
VCC = min, IOL = 8 mA
0.5
VCC = max
for pins 1,15
40
VIN = 2.7 V
A or B input
20
VCC = max
for pins 1,15
0.2
VIN = 7.0 V
A or B input
0.1
VCC = max
for pins 1,15
-0.8
VIN = 0.4 V
A or B input
-0.4
IIH
IIL
High Level Input Current
Low Level Input Current
IO
Output Short Circuit Current
VCC = max, VO = 0 V
(Note 1)
ICC
Supply Current
VCC = max (Note 2)
2.7
-20
V
V
µA
mA
mA
-100
mA
16
mA
Note 1: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 2: ICC is measured with all outputs open, and 4.5 V applied to all inputs.
2
IN74LS157
AC ELECTRICAL CHARACTERISTICS (TA=25°C, VCC = 5.0 V, CL = 15 pF, RL = 2 kΩ, tr =15
ns, tf = 6.0 ns)
Symbol
Parameter
Min
Max
Unit
tPLH
Propagation Delay, Input A or B to Output Y
14
ns
tPHL
Propagation Delay, Input A or B to Output Y
14
ns
tPLH
Propagation Delay, Select to Output Y
23
ns
tPHL
Propagation Delay, Select to Output Y
27
ns
tPLH
Propagation Delay, Output Enable to Output Y
20
ns
tPHL
Propagation Delay, Output Enable to Output Y
21
ns
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
NOTES A. CL includes probe and jig capacitance.
B. All diodes are 1N916 or 1N3064.
Figure 3. Test Circuit
3
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