SN74LS157 MULTIPLEXER Datasheet

SN74LS157 Datasheet, PDF, Equivalent


Part Number

SN74LS157

Description

QUAD 2-INPUT MULTIPLEXER

Manufacture

Motorola

Total Page 5 Pages
Datasheet
Download SN74LS157 Datasheet


SN74LS157
QUAD 2-INPUT MULTIPLEXER
The LSTTL / MSI SN54 / 74LS157 is a high speed Quad 2-Input Multiplexer.
Four bits of data from two sources can be selected using the common Select
and Enable inputs. The four buffered outputs present the selected data in the
true (non-inverted) form. The LS157 can also be used to generate any four
of the 16 different functions of two variables. The LS157 is fabricated with the
Schottky barrier diode process for high speed and is completely compatible
with all Motorola TTL families.
Schottky Process for High Speed
Multifunction Capability
Non-Inverting Outputs
Input Clamp Diodes Limit High Speed Termination Effects
Special Circuitry Ensures Glitch Free Multiplexing
ESD > 3500 Volts
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC E I0c I1c Zc I0d I1d Zd
16 15 14 13 12 11 10 9
NOTE:
The Flatpak version has
the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
1 2 3 4 56 78
S I0a I1d Za I0b I1b Zb GND
PIN NAMES
LOADING (Note a)
HIGH
LOW
S
E
I0a – I0d
I1a – I1d
Za – Zd
Common Select Input
Enable (Active LOW) Input
Data Inputs from Source 0
Data Inputs from Source 1
Multiplexer Outputs (Note b)
1.0 U.L.
1.0 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
0.5 U.L.
0.5 U.L.
0.25 U.L.
0.25 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.
LOGIC DIAGRAM
I0a I1a I0b
235
I1b
6
I0c
14
I1c
13
I0d
11
I1d E S
10 15
1
VCC = PIN 16
GND = PIN 8
4 7 12 9 = PIN NUMBERS
Za Zb Zc Zd
FAST AND LS TTL DATA
5-268
SN54/74LS157
QUAD 2-INPUT MULTIPLEXER
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
LOGIC SYMBOL
15 2 3 5 6 14 13 11 10
E I0a I1a I0b I1b I0c I1c I0d I1d
1S
Za Zb Zc Zd
4 7 12 9
VCC = PIN 16
GND = PIN 8

SN74LS157
SN54 / 74LS157
FUNCTIONAL DESCRIPTION
The LS157 is a Quad 2-Input Multiplexer fabricated with the
Schottky barrier diode process for high speed. It selects four
bits of data from two sources under the control of a common
Select Input (S). The Enable Input (E) is active LOW. When E
is HIGH, all of the outputs (Z) are forced LOW regardless of all
other inputs.
The LS157 is the logic implementation of a 4-pole,
2-position switch where the position of the switch is deter-
mined by the logic levels supplied to the Select Input. The logic
equations for the outputs are:
Za = E (I1a S + I0a S)
Zc = E (I1c S + I0c S)
Zb = E (I1b S + I0b S)
Zd = E (I1d S + I0d S)
A common use of the LS157 is the moving of data from two
groups of registers to four common output busses. The partic-
ular register from which the data comes is determined by the
state of the Select Input. A less obvious use is as a function
generator. The LS157 can generate any four of the 16 different
functions of two variables with one variable common. This is
useful for implementing highly irregular logic.
TRUTH TABLE
ENABLE
SELECT
INPUT
INPUTS
E S I0 I1
H X XX
L H XL
L H XH
L L LX
L L HX
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
OUTPUT
Z
L
L
H
L
H
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH Output Current — High
IOL Output Current — Low
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
– 0.4
mA
54 4.0 mA
74 8.0
FAST AND LS TTL DATA
5-269


Features QUAD 2-INPUT MULTIPLEXER The LSTTL / MSI SN54 / 74LS157 is a high speed Quad 2- Input Multiplexer. Four bits of data fr om two sources can be selected using th e common Select and Enable inputs. The four buffered outputs present the selec ted data in the true (non-inverted) for m. The LS157 can also be used to genera te any four of the 16 different functio ns of two variables. The LS157 is fabri cated with the Schottky barrier diode p rocess for high speed and is completely compatible with all Motorola TTL famil ies. SN54/74LS157 • • • • • • QUAD 2-INPUT MULTIPLEXER LOW POWE R SCHOTTKY Schottky Process for High S peed Multifunction Capability Non-Inver ting Outputs Input Clamp Diodes Limit H igh Speed Termination Effects Special C ircuitry Ensures Glitch Free Multiplexi ng ESD > 3500 Volts CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 E 15 I0c 14 I1c 1 3 Zc 12 I0d 11 I1d 10 Zd 9 NOTE: The Fl atpak version has the same pinouts (Con nection Diagram) as the Dual In-Line Package. 16 J SUFFIX CERAMIC CASE 620.
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