M54HC42

M74HC42

December 1992

BCD TO DECIMAL DECODER

B1R

(Plastic Package)

ORDER CODES :

M54HC42F1R

M74HC42M1R

M74HC42B1R

M74HC42C1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

NC =

No Internal

Connection

INPUT AND OUTPUT EQUIVALENT CIRCUIT

DESCRIPTION

.

HIGH SPEED

.

LOW POWER DISSIPATION

.

HIGH NOISE IMMUNITY

.

OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.

SYMMETRICAL OUTPUT IMPEDANCE

.

BALANCED PROPAGATION DELAYS

.

WIDE OPERATING VOLTAGE RANGE

.

PIN AND FUNCTION COMPATIBLE

WITH 54/74LS42

The M54/74HC42 is a high speed CMOS BCD-TO-

DECIMAL DECODER fabricated in silicon gate

C

It has the same high speed performance of LSTTL

combined with true CMOS low power consumption.

A BCD code applied to the four inputs A-D selects

one of ten decimal outputs Y0-Y9, which goes low

to fifteen gives a high level at all outputs. This device

also can be used as a 3-to-8 LINE DECODER, when

the D input is assigned as a disable input. This de-

vice is useful for code conversion, address decod-

ing, memory selection, demultiplexing, or readout

decoding.

All inputs are equipped with protection circuits against

static discharge and transient excess voltage.

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