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参数资料
| 型号： | MM74C923N |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 算术逻辑单元 |
| 英文描述： | CMOS SERIES, 9-BIT ENCODER, PDIP20 |
| 封装： | PLASTIC, DIP-20 |
| 文件页数： | 3/13页 |
| 文件大小： | 259K |
| 代理商： | MM74C923N |
Products > Military/Aerospace > Logic > 54C CMOS > MM54C922
Generic P/N 54C922
General Description
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MM54C922
16-Key Encoder
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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 k Ohm on resistance 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 entered 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 compatible.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MM74C923N | 制造商:Fairchild Semiconductor Corporation 功能描述:IC 74C CMOS 74C923 DIP20 15V |
| MM74C923N_Q | 功能描述:编码器、解码器、复用器和解复用器 20-Key Encoder RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
| MM74C923WM | 功能描述:编码器、解码器、复用器和解复用器 20-Key Encoder RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
| MM74C923WM | 制造商:Fairchild Semiconductor Corporation 功能描述:KEYBOARD ENCODER LOGIC IC |
| MM74C923WM_Q | 功能描述:编码器、解码器、复用器和解复用器 20-Key Encoder RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
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