MM74C923N/A+

更新时间： 2024-11-05 13:11:39

品牌	Logo	应用领域
美国国家半导体 - NSC		编码器
页数	文件大小	规格书
10页	220K
描述
IC,ENCODER,CMOS,DIP,20PIN,PLASTIC

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中文翻译

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技术参数
数据手册

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MM74C923N/A+ 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP20,.3	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	R-PDIP-T20
JESD-609代码：	e0	逻辑集成电路类型：	ENCODER
端子数量：	20	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：	DIP	封装等效代码：	DIP20,.3
封装形状：	RECTANGULAR	封装形式：	IN-LINE
电源：	5/15 V	子类别：	Arithmetic Circuits
表面贴装：	NO	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	Base Number Matches：	1

MM74C923N/A+ 数据手册

July 1993

MM54C922/MM74C922 16-Key Encoder

MM54C923/MM74C923 20-Key Encoder

General Description

These CMOS key encoders provide all the necessary logic

to fully encode an array of SPST switches. The keyboard

scan can be implemented by either an external clock or

external capacitor. These encoders also have on-chip pull-

up devices which permit switches with up to 50 kX on resist-

ance to be used. No diodes in the switch array are needed

to eliminate ghost switches. The internal debounce circuit

needs only a single external capacitor and can be defeated

by omitting the capacitor. A Data Available output goes to a

high level when a valid keyboard entry has been made. The

Data Available output returns to a low level when the en-

tered key is released, even if another key is depressed. The

Data Available will return high to indicate acceptance of the

new key after a normal debounce period; this two-key roll-

over is provided between any two switches.

An internal register remembers the last key pressed even

after the key is released. The TRI-STATE outputs provide

for easy expansion and bus operation and are LPTTL com-

patible.

Features

50 kX maximum switch on resistance

On or off chip clock

On-chip row pull-up devices

2 key roll-over

Keybounce elimination with single capacitor

Last key register at outputs

TRI-STATE outpust LPTTL compatible

Wide supply range

3V to 15V

Low power consumption

Connection Diagrams

Pin Assignment for

Dual-In-Line Package

Pin Assignment

for SOIC

Pin Assignment for

DIP and SOIC Package

TL/F/6037–14

Top View

TL/F/6037–1

Order Number MM74C922

Top View

TL/F/6037–2

Top View

Order Number MM54C922 or

MM74C922

Order Number MM54C923 or

MM74C923

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/6037

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

12 3 4 5 6 7...10

中文翻译

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与MM74C923N/A+相关器件

型号	品牌	获取价格	描述	数据表
MM74C923N/B+	NSC	获取价格	IC,ENCODER,CMOS,DIP,20PIN,PLASTIC
MM74C923N_NL	FAIRCHILD	获取价格	Encoder, CMOS Series, 9-Bit, CMOS, PDIP20, 0.300 INCH, PLASTIC, MS-001, DIP-20
MM74C923WM	ONSEMI	获取价格	Encoder
MM74C923WM	FAIRCHILD	获取价格	16-Key Encoder 20-Key Encoder
MM74C923WM	TI	获取价格	CMOS SERIES, 9-BIT ENCODER, PDSO20, PLASTIC, SO-20
MM74C923WM_NL	FAIRCHILD	获取价格	Encoder, CMOS Series, 9-Bit, CMOS, PDSO20, 0.300 INCH, MS-013, SOIC-20
MM74C923WMX	ONSEMI	获取价格	Encoder
MM74C923WMX	FAIRCHILD	获取价格	Encoder, CMOS Series, 9-Bit, CMOS, PDSO20, 0.300 INCH, MS-013, SOIC-20
MM74C923WMX	TI	获取价格	CMOS SERIES, 9-BIT ENCODER, PDSO20, PLASTIC, SO-20
MM74C923WMX_NL	FAIRCHILD	获取价格	Encoder, CMOS Series, 9-Bit, CMOS, PDSO20, 0.300 INCH, MS-013, SOIC-20

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