M54HCT157/158
M74HCT157/158
HCT157 QUAD 2 CHANNEL MULTIPLEXER
HCT158 QUAD 2 CHANNEL MULTIPLEXER (INV.)
.
.
.
.
.
.
.
HIGH SPEED
t
PD
= 21 ns (TYP.) AT V
CC
= 5 V
LOW POWER DISSIPATION
I
CC
= 4
µA
(MAX.) AT T
A
= 25
°C
COMPATIBLE WITH TTL OUTPUTS
V
IH
= 2V (MIN.) V
IL
= 0.8V (MAX)
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
SYMMETRICAL OUTPUT IMPEDANCE
IOH
= I
OL
= 4 mA (MIN.)
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS157/158
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCTXXXF1R
M74HCTXXXM1R
M74HCTXXXB1R
M74HCTXXXC1R
PIN CONNECTIONS
(top view)
HCT157
DESCRIPTION
The M54/74HCT157 and the M54/74HCT158 are
high speed CMOS QUAD 2-CHANNEL MULTI-
PLEXERs fabricated with silicon gate C
2
MOS tech-
nology. They achieve the high speed operation
similar to equivalent LSTTL while maintaining the
CMOS low power dissipation.
These devices consist of four 2-input digital multi-
plexers with common select and strobe inputs. The
HCT158 is an inverting multiplexer while the
HCT157 is a non-inverting multiplexer. When the
STROBE input is held High, selection of data is in-
hibited and all the outputs become Low in the
M74HCT157 and High in the M74HCT158. The SE-
LECT decoding determines whether the A or B in-
puts get routed to their corresponding Y outputs. All
inputs are equipped with protection circuits against
static discharge and transient excess voltage.
M54/74HCT devices are designed to directly inter-
2
face HSC MOS systems with TTL and NMOS com-
ponents. They are also plug in replacements for
LSTTL devices giving a reduction of power con-
sumption.
April 1993
HCT158
NC =
No Internal
Connection
1/11
M54/M74HCT157 M54/M74HCT158
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
or I
GND
P
D
T
stg
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Source Sink Current Per Output Pin
DC V
CC
or Ground Current
Power Dissipation
Storage Temperature
Lead Temperature (10 sec)
Parameter
Value
-0.5 to +7
-0.5 to V
CC
+ 0.5
-0.5 to V
CC
+ 0.5
±
20
±
20
±
25
±
50
500 (*)
-65 to +150
300
Unit
V
V
V
mA
mA
mA
mA
mW
o
C
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW:
≅
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
T
op
t
r
, t
f
Parameter
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature:
M54HC
Series
M74HC
Series
Input Rise and Fall Time (V
CC
= 4.5 to 5.5V)
Value
4.5 to 5.5
0 to V
CC
0 to V
CC
-55 to +125
-40 to +85
0 to 500
Unit
V
V
V
o
o
C
C
ns
4/11
Microcontroller MCU
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