Low-Voltage CMOS Quad
2-Input Multiplexer
With 5VTolerant Inputs
(NonInverting)
The MC74LCX157 is a high performance, quad 2input
multiplexer operating from a 2.3 to 3.6V supply. High impedance TTL
compatible inputs significantly reduce current loading to input drivers
while TTL compatible outputs offer improved switching noise
performance. A V
I
specification of 5.5V allows MC74LCX157 inputs
to be safely driven from 5V devices.
Four bits of data from two sources can be selected using the Select
and Enable inputs. The four outputs present the selected data in the
true (noninverted) form. The MC74LCX157 can also be used as a
function generator. Current drive capability is 24mA at the outputs.
Designed for 2.3 to 3.6V V
CC
Operation
5V Tolerant Inputs -- Interface Capability With 5V TTL Logic
LVTTL Compatible
LVCMOS Compatible
24mA Balanced Output Sink and Source Capability
Near Zero Static Supply Current (10
A) Substantially Reduces
System Power Requirements
Latchup Performance Exceeds 500mA
ESD Performance: Human Body Model >2000V; Machine Model
>200V
15
16
14
13
12
11
10
2
1
3
4
5
6
7
V
CC
9
8
E
I0c
I1c
Zc
I0d
I1d
Zd
S
I0a
I1a
Za
I0b
I1b
Zb
GND
Figure 1. 16Lead Pinout (Top View)
PIN NAMES
Function
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input
Select Input
Outputs
Pins
I0n
I1n
E
S
Zn
MC74LCX157
LOWVOLTAGE CMOS
QUAD 2INPUT MULTIPLEXER
M SUFFIX
PLASTIC SOIC EIAJ
CASE 96601
D SUFFIX
PLASTIC SOIC
CASE 751B05
DT SUFFIX
PLASTIC TSSOP
CASE 948F01
16
1
16
1
16
1
Semiconductor Components Industries, LLC, 2001
January, 2001 Rev. 2
1
Publication Order Number:
MC74LCX157/D
MC74LCX157
http://onsemi.com
2
Za
Figure 2. Logic Diagram
I0a
4
2
E
I1a
3
15
Zb
I0b
7
5
I1b
6
Zc
I0c
12
14
I1c
13
Zd
I0d
9
11
I1d
10
S
1
TRUTH TABLE
Inputs
Outputs
E
S
I0n
I1n
Zn
H
L
L
L
L
X
H
H
L
L
X
X
X
L
H
X
L
H
X
X
L
L
H
L
H
H = High Voltage Level; L = Low Voltage Level; X = High or Low Voltage Level ; For I
CC
Reasons DO
NOT FLOAT Inputs
MC74LCX157
http://onsemi.com
3
ABSOLUTE MAXIMUM RATINGS*
Symbol
Parameter
Value
Condition
Unit
V
CC
DC Supply Voltage
0.5 to +7.0
V
V
I
DC Input Voltage
0.5
V
I
+7.0
V
V
O
DC Output Voltage
0.5
V
O
V
CC
+ 0.5
Note 1.
V
I
IK
DC Input Diode Current
50
V
I
< GND
mA
I
OK
DC Output Diode Current
50
V
O
< GND
mA
+50
V
O
> V
CC
mA
I
O
DC Output Source/Sink Current
50
mA
I
CC
DC Supply Current Per Supply Pin
100
mA
I
GND
DC Ground Current Per Ground Pin
100
mA
T
STG
Storage Temperature Range
65 to +150
C
* Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or
conditions beyond those indicated may adversely affect device reliability. Functional operation under absolutemaximumrated conditions
is not implied.
1. Output in HIGH or LOW State. I
O
absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
Operating
Data Retention Only
2.0
1.5
3.3
3.3
3.6
3.6
V
V
I
Input Voltage
0
5.5
V
V
O
Output Voltage
(HIGH or LOW State)
0
V
CC
V
I
OH
HIGH Level Output Current, V
CC
= 3.0V 3.6V
24
mA
I
OL
LOW Level Output Current, V
CC
= 3.0V 3.6V
24
mA
I
OH
HIGH Level Output Current, V
CC
= 2.7V 3.0V
12
mA
I
OL
LOW Level Output Current, V
CC
= 2.7V 3.0V
12
mA
T
A
Operating FreeAir Temperature
40
+85
C
t/
V
Input Transition Rise or Fall Rate, V
IN
from 0.8V to 2.0V,
V
CC
= 3.0V
0
10
ns/V
DC ELECTRICAL CHARACTERISTICS
T
A
= 40
C to +85
C
Symbol
Characteristic
Condition
Min
Max
Unit
V
IH
HIGH Level Input Voltage (Note 2.)
2.7V
V
CC
3.6V
2.0
V
V
IL
LOW Level Input Voltage (Note 2.)
2.7V
V
CC
3.6V
0.8
V
V
OH
HIGH Level Output Voltage
2.7V
V
CC
3.6V; I
OH
= 100
A
V
CC
0.2
V
V
CC
= 2.7V; I
OH
= 12mA
2.2
V
CC
= 3.0V; I
OH
= 18mA
2.4
V
CC
= 3.0V; I
OH
= 24mA
2.2
V
OL
LOW Level Output Voltage
2.7V
V
CC
3.6V; I
OL
= 100
A
0.2
V
V
CC
= 2.7V; I
OL
= 12mA
0.4
V
CC
= 3.0V; I
OL
= 16mA
0.4
V
CC
= 3.0V; I
OL
= 24mA
0.55
2. These values of V
I
are used to test DC electrical characteristics only.
MC74LCX157
http://onsemi.com
4
DC ELECTRICAL CHARACTERISTICS
(continued)
T
A
= 40
C to +85
C
Symbol
Characteristic
Condition
Min
Max
Unit
I
I
Input Leakage Current
2.7V
V
CC
3.6V; 0V
V
I
5.5V
5.0
A
I
CC
Quiescent Supply Current
2.7
V
CC
3.6V; V
I
= GND or V
CC
10
A
CC
y
2.7
V
CC
3.6V; 3.6
V
I
5.5V
10
A
I
CC
Increase in I
CC
per Input
2.7
V
CC
3.6V; V
IH
= V
CC
0.6V
500
A
AC CHARACTERISTICS (t
R
= t
F
= 2.5ns; C
L
= 50pF; R
L
= 500
)
Limits
T
A
= 40
C to +85
C
V
CC
= 3.0V to 3.6V
V
CC
= 2.7V
Symbol
Parameter
Waveform
Min
Max
Max
Unit
t
PLH
t
PHL
Propagation Delay
In to Zn
1
1.5
1.5
5.8
5.8
6.3
6.3
ns
t
PLH
t
PHL
Propagation Delay
S to Zn
1,2
1.5
1.5
7.0
7.0
8.0
8.0
ns
t
PLH
t
PHL
Propagation Delay
E to Zn
2
1.5
1.5
7.0
7.0
8.0
8.0
ns
t
OSHL
t
OSLH
OutputtoOutput Skew
(Note 3.)
1.0
1.0
ns
3. Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device.
The specification applies to any outputs switching in the same direction, either HIGHtoLOW (t
OSHL
) or LOWtoHIGH (t
OSLH
); parameter
guaranteed by design.
DYNAMIC SWITCHING CHARACTERISTICS
T
A
= +25
C
Symbol
Characteristic
Condition
Min
Typ
Max
Unit
V
OLP
Dynamic LOW Peak Voltage (Note
4.)
V
CC
= 3.3V, C
L
= 50pF, V
IH
= 3.3V, V
IL
= 0V
0.8
V
V
OLV
Dynamic LOW Valley Voltage (Note
4.)
V
CC
= 3.3V, C
L
= 50pF, V
IH
= 3.3V, V
IL
= 0V
0.8
V
4. Number of outputs defined as "n". Measured with "n1" outputs switching from HIGHtoLOW or LOWtoHIGH. The remaining output is
measured in the LOW state.
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Condition
Typical
Unit
C
IN
Input Capacitance
V
CC
= 3.3V, V
I
= 0V or V
CC
7
pF
C
OUT
Output Capacitance
V
CC
= 3.3V, V
I
= 0V or V
CC
8
pF
C
PD
Power Dissipation Capacitance
10MHz, V
CC
= 3.3V, V
I
= 0V or V
CC
25
pF
MC74LCX157
http://onsemi.com
5
WAVEFORM 1 - NON-INVERTING PROPAGATION DELAYS
t
R
= t
F
= 2.5ns, 10% to 90%; f = 1MHz; t
W
= 500ns
2.7V
0V
V
OH
V
OL
In, S
Zn
t
PLH
t
PHL
1.5V
1.5V
1.5V
1.5V
Figure 3. AC Waveforms
WAVEFORM 2 - INVERTING PROPAGATION DELAYS
t
R
= t
F
= 2.5ns, 10% to 90%; f = 1MHz; t
W
= 500ns
2.7V
0V
V
OH
V
OL
E, S
Zn
t
PLH
t
PHL
1.5V
1.5V
1.5V
1.5V
PULSE
GENERATOR
R
T
DUT
V
CC
R
L
C
L
C
L
= 50pF or equivalent (Includes jig and probe capacitance)
R
L
= R
1
= 500
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
)
Figure 4. Test Circuit
PDF 
ZIP