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參數資料
| 型號： | MM74C923N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 算術邏輯單元 |
| 英文描述： | CMOS SERIES, 9-BIT ENCODER, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數： | 1/13頁 |
| 文件大小： | 259K |
| 代理商： | MM74C923N |
TLF6037
MM54C922MM74C922
16-Key
Encoder
MM54C923MM74C923
20-Key
Encoder
July 1993
MM54C922MM74C922 16-Key Encoder
MM54C923MM74C923 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
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
TLF6037 – 1
Top View
Order Number MM54C922 or
MM74C922
Pin Assignment
for SOIC
TLF6037 – 14
Top View
Order Number MM74C922
Pin Assignment for
DIP and SOIC Package
TLF6037 – 2
Top View
Order Number MM54C923 or
MM74C923
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MM74C923N | 制造商:Fairchild Semiconductor Corporation 功能描述:IC 74C CMOS 74C923 DIP20 15V |
| MM74C923N_Q | 功能描述:編碼器、解碼器、復用器和解復用器 20-Key Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| MM74C923WM | 功能描述:編碼器、解碼器、復用器和解復用器 20-Key Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| MM74C923WM | 制造商:Fairchild Semiconductor Corporation 功能描述:KEYBOARD ENCODER LOGIC IC |
| MM74C923WM_Q | 功能描述:編碼器、解碼器、復用器和解復用器 20-Key Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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