Datasheet > 逻辑 > 计数器> MM74HCT191N

MM74HCT191N

更新时间： 2024-02-15 15:10:15

品牌	Logo	应用领域
美国国家半导体 - NSC		时钟
页数	文件大小	规格书
8页	173K
描述
IC HCT SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDIP16, DIP-16, Counter

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技术参数
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MM74HCT191N 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	SOP, SOP16,.4	Reach Compliance Code：	unknown
风险等级：	5.92	计数方向：	BIDIRECTIONAL
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e0
负载/预设输入：	YES	逻辑集成电路类型：	BINARY COUNTER
工作模式：	SYNCHRONOUS	功能数量：	1
端子数量：	16	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP16,.4
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
电源：	5 V	认证状态：	Not Qualified
子类别：	Counters	标称供电电压 (Vsup)：	5 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	Base Number Matches：	1

MM74HCT191N 数据手册

January 1988

MM54HCT190/MM74HCT190 Synchronous Decade Up/

Down Counters with Mode Control. MM54HCT191/

MM74HCT191 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 counters. The

MM54HCT191/MM74HCT191 are 4-bit binary counters and

the MM54HCT190/MM74HCT190 are BCD counters.

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.

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.

MM54HCT/MM74HCT devices are intended to interface be-

tween TTL and NMOS components and standard CMOS

devices. These parts are also plug-in replacements for LS-

TTL devices can be used to reduce power consumption in

existing designs.

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 divide by

N dividers by simply modifying the count length with the

preset inputs.

Features

Level changes on Enable or Down/Up can be made

regardless of the level of the clock.

Low quiescent supply current: 80 mA maximum

(74HCT Series)

Low input current: 1 mA maximum

TTL compatible inputs

Connection Diagram

Truth Table

Enable

Down/

Dual-In-Line Package

Load

Clock

Function

Count Up

Count Down

Load

No Change

Order Number MM54HCT190/191

or MM74HCT190/191

TL/F/5744–1

1995 National Semiconductor Corporation

TL/F/5744

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

12 3 4 5 6 7 8

中文翻译

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与MM74HCT191N相关器件

型号	品牌	获取价格	描述	数据表
MM74HCT191N/A+	NSC	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,HCT-CMOS,DIP,16PIN,PLASTIC
MM74HCT191N/B+	NSC	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,HCT-CMOS,DIP,16PIN,PLASTIC
MM74HCT191WM	TI	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,HCT-CMOS,SOP,16PIN,PLASTIC
MM74HCT192J	FAIRCHILD	获取价格	Decade Counter, Synchronous, Bidirectional, CMOS, CDIP16,
MM74HCT192N	FAIRCHILD	获取价格	Decade Counter, Synchronous, Bidirectional, CMOS, PDIP16,
MM74HCT193	NSC	获取价格	Synchronous Binary Up/Down Counters
MM74HCT193J	NSC	获取价格	Synchronous Binary Up/Down Counters
MM74HCT193J/A+	NSC	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,HCT-CMOS,DIP,16PIN,CERAMIC
MM74HCT193N	NSC	获取价格	Synchronous Binary Up/Down Counters
MM74HCT193N/A+	TI	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,HCT-CMOS,DIP,16PIN,PLASTIC

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