TLF5901

February 1988

MM54C192MM74C192

Synchronous 4-Bit UpDown Decade Counter

MM54C193MM74C193

Synchronous 4-Bit UpDown Binary Counter

General Description

These updown counters are monolithic complementary

MOS (CMOS) integrated circuits

The MM54C192 and

MM74C192 are BCD counters while the MM54C193 and

MM74C193 are binary counters

Counting up and counting down is performed by two count

inputs one being held high while the other is clocked The

outputs change on the positive-going transition of this clock

These counters feature preset inputs that are set when load

is a logical ‘‘0’’ and a clear which forces all outputs to ‘‘0’’

when it is at a logical ‘‘1’’ The counters also have carry and

borrow outputs so that they can be cascaded using no ex-

ternal circuitry

Features

Y

High noise margin

1V guaranteed

Y

Tenth power TTL compatible

Drive 2 LPTTL loads

Y

Wide supply range

3V to 15V

Y

Carry and borrow outputs for N-bit cascading

Y

Asynchronous clear

Y

High noise immunity

Connection Diagram

Dual-In-Line Package

TLF5901 – 1

Top View

Order Number MM54C192 MM74C192

MM54C193 or MM74C193

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A