MM54HC190J NSC [National Semiconductor], MM54HC190J Datasheet

MM54HC190J

Manufacturer Part Number

MM54HC190J

Description

MM54HC190/MM74HC190 Synchronous Decade Up/Down Counters with Mode Control MM54HC191/MM74HC191 Synchronous Binary Up/Down Counters with Mode Control

Manufacturer

NSC [National Semiconductor]

Datasheet

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C 1995 National Semiconductor Corporation

MM54HC190 MM74HC190 Synchronous

Decade Up Down Counters with Mode

Control MM54HC191 MM74HC191

Synchronous Binary Up Down Counters

with Mode Control

General Description

These high speed synchronous counters utilize advanced

silicon-gate CMOS technology They possess the high noise

immunity and low power consumption of CMOS technology

along with the speeds of low power Schottky TTL

These circuits are synchronous reversible up down count-

ers The MM54HC191 MM74HC191 are 4-bit binary count-

ers and the MM54HC190 MM74HC190 are BCD counters

Synchronous operation is provided by having all flip-flops

clocked simultaneously so that the outputs change simulta-

neously when so instructed by the steering logic This mode

of operation eliminates the output counting spikes normally

associated with asynchronous (ripple clock) counters

The outputs of the four master-slave flip-flops are triggered

on a low-to-high level transition of the clock input if the

enable input is low A high at the enable input inhibits count-

ing The direction of the count is determined by the level of

the down up input When low the counter counts up and

when high it counts down

These counters are fully programmable that is the outputs

may be preset to either level by placing a low on the load

input and entering the desired data at the data inputs The

output will change independent of the level of the clock in-

put This feature allows the counters to be used as modulo-

Connection Diagram

Dual-In-Line Package

Top View

TL F 5322

TL F 5322 – 1

N dividers by simply modifying the count length with the

preset inputs

Two outputs have been made available to perform the cas-

cading function ripple clock and maximum minimum count

The latter output produces a high-level output pulse with a

duration approximately equal to one complete cycle of the

clock when the counter overflows or underflows The ripple

clock output produces a low-level output pulse equal in

width to the low-level portion of the clock input when an

overflow or underflow condition exists The counters can be

easily cascaded by feeding the ripple clock output to the

enable input of the succeeding counter if parallel clocking is

used or to the clock input if parallel enabling is used The

maximum minimum count output can be used to accom-

plish look-ahead for high-speed operation

Features

Load

Order Number MM54HC190 191 or MM74HC190 191

Level changes on Enable or Down Up can be made re-

gardless of the level of the clock input

Wide power supply range 2– 6V

Low quiescent supply current 80 A maximum

(74HC Series)

Low input current 1 A maximum

Asynchronous inputs Low input to load sets Q

Enable

B Q

Down

C and Q

Clock

RRD-B30M105 Printed in U S A

Count Down

No Change

January 1988

Function

Count Up

Load

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MM54HC190J Summary of contents

Page 1

MM54HC190 MM74HC190 Synchronous Decade Up Down Counters with Mode Control MM54HC191 MM74HC191 Synchronous Binary Up Down Counters with Mode Control General Description These high speed synchronous counters utilize advanced silicon-gate CMOS technology They possess the high noise immunity and low ...

Page 2

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage ( Input Voltage ( Output Voltage ( ...

Page 3

AC Electrical Characteristics Symbol Parameter AC Electrical Characteristics From Symbol Parameter (Input From To (Input) (Output ...

Page 4

AC Electrical Characteristics From Symbol Parameter (Input) Note 5 C determines the no load dynamic power consumption (Continued Conditions (Output) Typ ...

Page 5

Logic Diagrams Pin (16) V Pin ( ’HC190 Decade Counters GND 5322 – 2 ...

Page 6

Logic Diagrams (Continued) ’HC191 Binary Counters Pin (16) V Pin (8) GND 5322– 3 ...

Page 7

Timing Diagrams ’HC190 Synchronous Decade Counters Typical Load Count and Inhibit Sequences Sequence (1) Load (preset) to BCD seven (2) Count up to eight nine zero one and two (3) Inhibit (4) Count down to one zero nine eight and ...

Page 8

... Physical Dimensions inches (millimeters) Order Number MM54HC190J MM54HC191J MM74HC190J or MM74HC191J Order Number MM74HC190N or MM74HC191N LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein ...

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