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M74C923 の電気的特性と機能

M74C923のメーカーはFairchild Semiconductorです、この部品の機能は「 MM74C923」です。


製品の詳細 ( Datasheet PDF )

部品番号 M74C923
部品説明 MM74C923
メーカ Fairchild Semiconductor
ロゴ Fairchild Semiconductor ロゴ 




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M74C923 Datasheet, M74C923 PDF,ピン配置, 機能
October 1987
Revised January 1999
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MM74C922 • MM74C923
16-Key Encoder • 20-Key Encoder
General Description
The MM74C922 and MM74C923 CMOS key encoders pro-
vide 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 kon 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 3-STATE outputs provide for
easy expansion and bus operation and are LPTTL compat-
ible.
Features
s 50 kmaximum switch on resistance
s On or off chip clock
s On-chip row pull-up devices
s 2 key roll-over
s Keybounce elimination with single capacitor
s Last key register at outputs
s 3-STATE output LPTTL compatible
s Wide supply range: 3V to 15V
s Low power consumption
Ordering Code:
Order Number Package Number
Package Description
MM74C922N
N18A
18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
MM74C922WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
MM74C923WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
MM74C923N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagrams
Pin Assignment for DIP
Pin Assignment for SOIC
Top View
MM94C922
© 1999 Fairchild Semiconductor Corporation DS006037.prf
Top View
MM74C922
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1 Page





M74C923 pdf, ピン配列
Block Diagram
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3 www.fairchildsemi.com


3Pages


M74C923 電子部品, 半導体
Switching Time Waveforms
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T1 T2 RC, T3 0.7 RC, where R 10k and C is external capacitor at KBM input.
FIGURE 1.
FIGURE 2.
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6

6 Page



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データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

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部品番号部品説明メーカ
M74C923

MM74C923

Fairchild Semiconductor
Fairchild Semiconductor


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