MM74C922 Fairchild, MM74C922 Datasheet
MM74C922
Manufacturer Part Number
MM74C922
Description
16-Key Encoder 20-Key Encoder
Manufacturer
Fairchild
Datasheet
1.MM74C922.pdf
(10 pages)
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© 1999 Fairchild Semiconductor Corporation
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 k
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.
Ordering Code:
MM74C922N
MM74C922WM
MM74C923WM
MM74C923N
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagrams
Order Number
Pin Assignment for DIP
Package Number
MM94C922
Top View
M20B
M20B
N18A
N20A
on resistance to be used. No
18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
DS006037.prf
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
50 k
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
3-STATE output LPTTL compatible
Wide supply range:
Low power consumption
Package Description
maximum switch on resistance
Pin Assignment for SOIC
MM74C922
Top View
3V to 15V
October 1987
Revised January 1999
www.fairchildsemi.com
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