M54/M74HC190

M54/M74HC191

October 1992

4 BIT SYNCHRONOUS UP/DOWN COUNTERS

B1R

(Plastic Package)

ORDER CODES :

M54HCXXXF1R

M74HCXXXM1R

M74HCXXXB1R

M74HCXXXC1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

NC =

No Internal

Connection

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 54/74LS190/191

The M54/74HC190/191 are high speed CMOS 4-BIT

SYNCHRONOUS UP/DOWN COUNTERS fabri-

cated in silicon gate C

They have the same high speed performance of

LSTTL combined with true CMOS low power con-

sumption.

State changes of the counter are synchronous with

the LOW-to-HIGH transition of the Clock Pulse input.

An asynchronous parallel load input overrides count-

ing and loads the data present on the DATA inputs into

the flip-flops, which makes it possible to use the cir-

cuits as programmable counters. A countenable input

serves as the carry/borrow input in multi-stage

counters.

Control input,

Down/Up, determines

whether a circuit counts up or down. A MAX/MIN out-

put and a Ripple Clock output provide overflow/under-

flow indication and make possible a variety of

methods for generating carry/borrow signals in multi-

stage counter applications.

All inputs are equipped with protection circuits against

static discharge and transient excess voltage.

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