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MM74C923MX PDF预览

MM74C923MX

更新时间: 2024-09-15 19:26:27
品牌 Logo 应用领域
德州仪器 - TI 编码器光电二极管逻辑集成电路
页数 文件大小 规格书
13页 259K
描述
CMOS SERIES, 9-BIT ENCODER, PDSO20, PLASTIC, SOP-20

MM74C923MX 技术参数

生命周期:Obsolete零件包装代码:SOIC
包装说明:SOP,针数:20
Reach Compliance Code:unknownHTS代码:8542.39.00.01
风险等级:5.7其他特性:20 KEY ENCODER
系列:CMOSJESD-30 代码:R-PDSO-G20
长度:12.8 mm负载电容(CL):50 pF
逻辑集成电路类型:ENCODER位数:9
功能数量:1端子数量:20
最高工作温度:85 °C最低工作温度:-40 °C
输出特性:3-STATE封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE传播延迟(tpd):150 ns
认证状态:Not Qualified座面最大高度:2.65 mm
最大供电电压 (Vsup):15 V最小供电电压 (Vsup):3 V
标称供电电压 (Vsup):5 V表面贴装:YES
技术:CMOS温度等级:INDUSTRIAL
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL宽度:7.5 mm
Base Number Matches:1

MM74C923MX 数据手册

 浏览型号MM74C923MX的Datasheet PDF文件第2页浏览型号MM74C923MX的Datasheet PDF文件第3页浏览型号MM74C923MX的Datasheet PDF文件第4页浏览型号MM74C923MX的Datasheet PDF文件第5页浏览型号MM74C923MX的Datasheet PDF文件第6页浏览型号MM74C923MX的Datasheet PDF文件第7页 
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.  
É
Features  
Y
50 kX maximum switch on resistance  
Y
On or off chip clock  
Y
On-chip row pull-up devices  
Y
2 key roll-over  
Y
Keybounce elimination with single capacitor  
Y
Last key register at outputs  
Y
TRI-STATE outpust LPTTL compatible  
Y
Wide supply range  
3V to 15V  
Y
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/603714  
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.  
C
1995 National Semiconductor Corporation  
TL/F/6037  
RRD-B30M105/Printed in U. S. A.  

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