5-252
FAST AND LS TTL DATA
8-INPUT MULTIPLEXER
The TTL/MSI SN54/74LS151 is a high speed 8-input Digital Multiplexer.
It provides, in one package, the ability to select one bit of data from up to eight
sources. The LS151 can be used as a universal function generator to
generate any logic function of four variables. Both assertion and negation
outputs are provided.
•Schottky Process for High Speed
•Multifunction Capability
•On-Chip Select Logic Decoding
•Fully Buffered Complementary Outputs
•Input Clamp Diodes Limit High Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
PIN NAMES LOADING (Note a)
HIGH LOW
S0–S2
E
I0–I7
Z
Z
Select Inputs
Enable (Active LOW) Input
Multiplexer Inputs
Multiplexer Output (Note b)
Complementary Multiplexer Output
(Note b)
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
Temperature Ranges.
SN54/74LS151
8-INPUT MULTIPLEXER
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16 1
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ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
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CASE 751B-03
LOGIC SYMBOL
5-253
FAST AND LS TTL DATA
SN54/74LS151
LOGIC DIAGRAM
FUNCTIONAL DESCRIPTION
The LS151 is a logical implementation of a single pole,
8-position switch with the switch position controlled by the
state of three Select inputs, S0, S1, S2. Both assertion and
negation outputs are provided. The Enable input (E) is active
LOW. When it is not activated, the negation output is HIGH
and the assertion output is LOW regardless of all other inputs.
The logic function provided at the output is:
Z = E ⋅ (I0 ⋅ S0 ⋅ S1 ⋅ S2 + ⋅ I1 ⋅ S0 ⋅ S1 ⋅ S2 + I2 ⋅ S0 ⋅ S1 ⋅ S2
+ I3 ⋅ S0 ⋅ S1 ⋅ S2 + I4 ⋅ S0 ⋅ S1 ⋅ S2 + I5 ⋅ S0 ⋅ S1 ⋅ S2 + I6 ⋅ S0
⋅ S1 ⋅ S2 + I7 ⋅ S0 ⋅ S1 ⋅ S2).
The LS151 provides the ability, in one package, to select
from eight sources of data or control information. By proper
manipulation of the inputs, the LS151 can provide any logic
function of four variables and its negation.
TRUTH TABLE
E S2S1S0I0I1I2I3I4I5I6I7Z Z
H X X X X X X X X X X X H L
L L L L L X X X X X X X H L
L L L L H X X X X X X X L H
L L L H X L X X X X X X H L
L L L H X H X X X X X X L H
L L H L X X L X X X X X H L
L L H L X X H X X X X X L H
L L H H X X X L X X X X H L
L L H H X X X H X X X X L H
L H L L X X X X L X X X H L
L H L L X X X X H X X X L H
L H L H X X X X X L X X H L
L H L H X X X X X H X X L H
L H H L X X X X X X L X H L
L H H L X X X X X X H X L H
L H H H X X X X X X X L H L
L H H H X X X X X X X H L H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
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FAST AND LS TTL DATA
SN54/74LS151
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High 54, 74 –0.4 mA
IOL Output Current — Low 54
74 4.0
8.0 mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54 0.7
V
Guaranteed Input LOW Voltage for
VIL
Input LOW Voltage
74 0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
54 2.5 3.5 V
V
CC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
Output HIGH Voltage
74 2.7 3.5 V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Output LOW Voltage
54, 74 0.25 0.4 V IOL = 4.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
Output LOW Voltage
74 0.35 0.5 V IOL = 8.0 mA
VIN = VIL or VIH
per Truth Table
IIH
Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current (Note 1) –20 –100 mA VCC = MAX
ICC Power Supply Current 10 mA VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
tPHL Propagation Delay
Select to Output Z 27
18 43
30 ns
VCC = 5.0 V
CL = 15 pF
tPLH
tPHL Propagation Delay
Select to Output Z 14
20 23
32 ns
VCC = 5.0 V
CL = 15 pF
tPLH
tPHL Propagation Delay
Enable to Output Z 26
20 42
32 ns
V
CC = 5.0 V
CL = 15 pF
tPLH
tPHL Propagation Delay
Enable to Output Z 15
18 24
30 ns
VCC = 5.0 V
CL = 15 pF
tPLH
tPHL Propagation Delay
Data to Output Z 20
16 32
26 ns
tPLH
tPHL Propagation Delay
Data to Output Z 13
12 21
20 ns
AC WAVEFORMS
Figure 1 Figure 2
5-255
FAST AND LS TTL DATA
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5-256
FAST AND LS TTL DATA
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