M54/M74HC257

M54/M74HC258

October 1992

HC258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING)

HC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

B1R

(Plastic Package)

ORDER CODES :

M54HCXXXF1R

M74HCXXXM1R

M74HCXXXB1R

M74HCXXXC1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

.

HIGH SPEED

.

LOW POWER DISSIPATION

.

HIGH NOISE IMMUNITY

.

OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

.

SYMMETRICAL OUTPUT IMPEDANCE

.

BALANCED PROPAGATION DELAYS

.

WIDE OPERATING VOLTAGE RANGE

.

PIN AND FUNCTION COMPATIBLE

WITH 54/74LS257/258

DESCRIPTION

The M54/74HC257 and the M54/74HC258 are high

speed CMOS MULTIPLEXERs fabricated with sili-

con gate C

They have the same high speed performance of

LSTTL combined with true CMOS low power con-

sumption.

These IC’s are composed of an independent 2-

channel multiplexer with common SELECT and EN-

ABLE INPUT.

The M54/74HC258 is an inverting multiplexer while

the M54/74HC257 is a non-inverting multiplexer.

When the ENABLE INPUT is held ”High”, outputs of

both IC’s become high-impedance state. If SELECT

INPUT is held ”Low”, ”A” data is selected, when SE-

LECT INPUT is high ”H”, ”B” data is chosen.

All inputs are equipped with protection circuits

against static discharge and transient excess volt-

age.

HC257

HC258

1/12