M54HCT157/158

M74HCT157/158

April 1993

HCT158 QUAD 2 CHANNEL MULTIPLEXER (INV.)

HCT157 QUAD 2 CHANNEL MULTIPLEXER

B1R

(Plastic Package)

ORDER CODES :

M54HCTXXXF1R

M74HCTXXXM1R

M74HCTXXXB1R

M74HCTXXXC1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

NC =

No Internal

Connection

HCT158

HCT157

DESCRIPTION

.

HIGH SPEED

.

LOW POWER DISSIPATION

.

COMPATIBLE WITH TTL OUTPUTS

.

OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.

SYMMETRICAL OUTPUT IMPEDANCE

.

BALANCED PROPAGATION DELAYS

.

PIN AND FUNCTION COMPATIBLE

WITH 54/74LS157/158

The M54/74HCT157 and the M54/74HCT158 are

high speed CMOS QUAD 2-CHANNEL MULTI-

PLEXERs fabricated with silicon gate C

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 HSC

ponents. They are also plug in replacements for

LSTTL devices giving a reduction of power con-

sumption.

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