MM74HC191

更新时间： 2024-09-22 21:54:55

品牌	Logo	应用领域
美国国家半导体 - NSC		计数器
页数	文件大小	规格书
8页	205K
描述
MM54HC190/MM74HC190 Synchronous Decade Up/Down Counters with Mode Control MM54HC191/MM74HC191 Synchronous Binary Up/Down Counters with Mode Control

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MM74HC191 数据手册

January 1988

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.

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.

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.

Features

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

gardless of the level of the clock input

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-

Wide power supply range: 2–6V

Low quiescent supply current: 80 mA maximum

(74HC Series)

Low input current: 1 mA maximum

Connection Diagram

Dual-In-Line Package

Enable

Down/

Load

Clock

Function

Count Up

Count Down

Load

No Change

Asynchronous inputs Low input to load sets Q

C, and Q D

B, Q

Order Number MM54HC190/191 or MM74HC190/191

TL/F/5322–1

Top View

1995 National Semiconductor Corporation

TL/F/5322

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7 8

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与MM74HC191相关器件

型号	品牌	获取价格	描述	数据表
MM74HC191J	NSC	获取价格	MM54HC190/MM74HC190 Synchronous Decade Up/Down Counters with Mode Control MM54HC191/MM74HC
MM74HC191N	NSC	获取价格	MM54HC190/MM74HC190 Synchronous Decade Up/Down Counters with Mode Control MM54HC191/MM74HC
MM74HC191N/B+	NSC	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,HC-CMOS,DIP,16PIN,PLASTIC
MM74HC191WM	NSC	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,HC-CMOS,SOP,16PIN,PLASTIC
MM74HC192	NSC	获取价格	Synchronous Decade Up/Down Counters Synchronous Binary Up/Down Counters
MM74HC192J	TI	获取价格	IC HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL DECADE COUNTER, CDIP16, D
MM74HC192J/A+	TI	获取价格	IC,COUNTER,UP/DOWN,DECADE,HC-CMOS,DIP,16PIN,CERAMIC
MM74HC192N	TI	获取价格	HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL DECADE COUNTER, PDIP16, DIP-
MM74HC192N	FAIRCHILD	获取价格	Decade Counter, Synchronous, Bidirectional, CMOS, PDIP16,
MM74HC192N/A+	TI	获取价格	IC,COUNTER,UP/DOWN,DECADE,HC-CMOS,DIP,16PIN,PLASTIC

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