M54HC298

M74HC298

October 1992

QUAD 2 CHANNEL MULTIPLEXER/REGISTER

B1R

(Plastic Package)

ORDER CODES :

M54HC298F1R

M74HC298M1R

M74HC298B1R

M74HC298C1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

NC =

No Internal

Connection

.

HIGH SPEED

.

LOW POWER DISSIPATION

.

HIGH NOISE IMMUNITY

.

OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.

SYMMETRICAL OUTPUT IMPEDANCE

I

.

BALANCED PROPAGATION DELAYS

.

WIDE OPERATING VOLTAGE RANGE

.

PIN AND FUNCTION COMPATIBLE

WITH 54/74LS298

DESCRIPTION

The M54/74HC298 is a high speed CMOS QUAD 2-

CHANNEL MULTIPLEXER/REGISTER fabricated

in silicon gate C

It has the same high speed performance of LSTTL

combined with true CMOS low power consumption.

These circuits are controlled by the signals WORD

SELECT and CLOCK. When the WORD SELECT

input is taken low Word 1 (A1, B1, C1 and D1) is

presented to the input of the flip-flops, and when

WORD SELECT is high Word 2 (A2, B2, C2 and D2)

is presented to the inputs of the flip-flops. The select

word is clocked to the output terminals on the nega-

tive edge of the clock pulse. All inputs are equipped

with protection circuits against static discharge and

transient excess voltage.

INPUT AND OUTPUT EQUIVALENT CIRCUIT

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