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M74HCT157 Datasheet

QUAD 2 CHANNEL MULTIPLEXER

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M54HCT157/158
M74HCT157/158
HCT157 QUAD 2 CHANNEL MULTIPLEXER
HCT158 QUAD 2 CHANNEL MULTIPLEXER (INV.)
. HIGH SPEED
tPD = 21 ns (TYP.) AT VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
. COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN.) VIL = 0.8V (MAX)
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
IOH= IOL = 4 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS157/158
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCTXXXF1R M74HCTXXXM1R
M74HCTXXXB1R M74HCTXXXC1R
PIN CONNECTIONS (top view)
DESCRIPTION
The M54/74HCT157 and the M54/74HCT158 are
high speed CMOS QUAD 2-CHANNEL MULTI-
PLEXERs fabricated with silicon gate C2MOS 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-
face HSC2MOS 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
HCT157
HCT158
NC =
No Internal
Connection
1/11


STMicroelectronics Electronic Components Datasheet

M74HCT157 Datasheet

QUAD 2 CHANNEL MULTIPLEXER

No Preview Available !

M54/M74HCT157 M54/M74HCT158
CHIP CARRIER
HCT157
HCT158
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION (for HCT157)
PIN No
1
2, 5, 11, 14
3, 6, 10, 13
4, 7, 9, 12
15
8
16
SYMBOL
SELECT
1A to 4A
1B to 4B
1Y to 4Y
STROBE
GND
VCC
NAME AND FUNCTION
Common Data Select
Input
Data Inputs From
Source A
Data Inputs From
Source B
Multiplexer Output
Strobe Input
Ground (0V)
Positive Supply Voltage
PIN DESCRIPTION (for HCT158)
PIN No
1
2, 5, 11, 14
3, 6, 10, 13
4, 7, 9, 12
15
8
16
SYMBOL
SELECT
1A to 4A
1B to 4B
1Y to 4Y
STROBE
GND
VCC
NAME AND FUNCTION
Common Data Select
Input
Data Inputs From
Source A
Data Inputs From
Source B
Multiplexer Output
Strobe Input
Ground (0V)
Positive Supply Voltage
2/11


Part Number M74HCT157
Description QUAD 2 CHANNEL MULTIPLEXER
Maker STMicroelectronics
Total Page 11 Pages
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