Philips 74lvc157a DATASHEETS
INTEGRATED CIRCUITS
74LVC157A
Quad 2-input multiplexer
Product specification
Supercedes data of 1997 Nov 07
IC24 Data Handbook
1998 Jul 29
Philips Semiconductors Product specification
74L VC157AQuad 2-input multiplexer
FEA TURES
•Wide supply voltage range of 1.2 to 3.6 V
•In accordance with JEDEC standard no. 8-1A
•CMOS lower power consumption
•Direct interface with TTL levels
•5 Volt tolerant inputs, for interfacing with 5 Volt logic
DESCRIPTION
The 74LVC157A is a high-performance, low-power, Si-gate CMOS
device, superior to most advanced CMOS compatible TTL families.
Inputs can be driven from either 3.3V or 5.0V devices. In 3-State
operation, outputs can handle 5V. This feature allows the use of
these devices as translators in a mixed 3.3V/5V environment.
The 74LVC157A is a quad 2-input multiplexer which select 4 bits of
data from two sources under the control of a common data select
QUICK REFERENCE DATA
GND = 0 V; T
= 25°C; tr = t
amb
SYMBOL
t
PHL/tPLH
C
I
C
PD
NOTES:
1. C
is used to determine the dynamic power dissipation (PD in µW)
PD
= CPD × V
P
D
f
= input frequency in MHz; CL = output load capacitance in pF;
i
= output frequency in MHz; VCC = supply voltage in V;
f
o
× V
Σ (C
L
2
× fi Σ (CL × V
CC
2
× fo) = sum of the outputs.
CC
≤ 2.5 ns
f
PARAMETER CONDITIONS TYPICAL UNIT
Propagation delay
nl0, nl1, to nY
E
to nY
S to nY
Input capacitance 5.0 pF
Power dissipation capacitance per gate VI = GND to V
2
× fo) where:
CC
input (S). The four outputs present the selected data in the true
(non-inverted) form. The enable input (E
) is active LOW. When E is
HIGH, all of the outputs (1Y to 4Y) are forced LOW regardless of all
other input conditions. Moving the data from two groups of registers
to four common output buses is a common use of the 74LV157. The
state of the common data select input (S) determines the particular
register from which the data comes. It can also be used as function
generator.
The device is useful for implementing highly irregular logic by
generating any four of the 16 different functions of two variables with
one variable common.
The 74LVC157A is the logic implementation of a 4-pole, 2-position
switch, where the position of the switch is determined by the logic
levels applied to S.
CL = 50 pF;
VCC = 3.3 V
3.1
3.0
3.3
CC
1
33 pF
ns
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #
16-Pin Plastic SO –40°C to +85°C 74LVC157A D 74LVC157A D SOT109-1
16-Pin Plastic SSOP Type II –40°C to +85°C 74LVC157A DB 74LVC157A DB SOT338-1
16-Pin Plastic TSSOP Type I –40°C to +85°C 74LVC157A PW 74LVC157APW DH SOT403-1
PIN CONFIGURATION
1
S
2
1I
0
3
1I
1
4
1Y
5
2I
0
6
2I
1
7
2Y
GND
8
1998 Jul 29 853-1945 19802
16
15
14
13
12
11
10
9
SV00563
V
CC
E
4I
0
4I
1
4Y
3I
0
3I
1
3Y
PIN DESCRIPTION
PIN
NUMBER
1 S Common data select input
2, 5, 11, 14 1l0 to 4l
3, 6, 10, 13 1l1 to 4l
4, 7, 9, 12 1Y to 4Y Multiplexer outputs
8 GND Ground (0 V)
15 E Enable input (active LOW)
16 V
2
SYMBOL FUNCTION
Data inputs from sources 0
0
Data inputs from sources 1
1
CC
Positive supply voltage
Philips Semiconductors Product specification
74LVC157AQuad 2-input multiplexer
LOGIC SYMBOL
35
2
1I
1
15
S
E
2I
1I
0
0
1
1Y
4
LOGIC SYMBOL (IEEE/IEC)
1
15
2
3
5
6
11
10
14
13
G1
EN
MUX
1
1
FUNCTIONAL DIAGRAM
6
2I
2Y
7
10
2
1I
0
3
1I
3I
1
3Y
9
4I
3I
0
4Y
12
4I
0
1
1
SV00564
1
5
2I
0
6
2I
1
11
3I
10
3I
14
4I
13
4I
SELECTOR
0
1
0
1
S
115
MULTIPLEXER
OUTPUTS
E
1Y
2Y
3Y
4Y
SV00566
4
7
9
12
13
1411
FUNCTION TABLE
INPUTS OUTPUTS
4
E S nl
0
nl
1
nY
H X X X L
7
L L L X L
L L H X H
L H X L L
L H X H H
9
NOTES:
H = HIGH voltage level
L = LOW voltage level
12
X = don’t care
LOGIC DIAGRAM
SV00565
S
1998 Jul 29
E
1I
1
1I
0
2I
1
2I
0
3I
1
3I
0
4I
1
4I
0
1Y
2Y
3Y
4Y
SV00581
3
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