MM74C922WM_Q Fairchild Semiconductor, MM74C922WM_Q Datasheet

MM74C922WM_Q

Manufacturer Part Number

MM74C922WM_Q

Description

Encoders, Decoders, Multiplexers & Demultiplexers 16-Key Encoder

Manufacturer

Fairchild Semiconductor

Datasheet

1.MM74C922WM_Q.pdf (11 pages)

Specifications of MM74C922WM_Q

Product Category

Encoders, Decoders, Multiplexers & Demultiplexers

Product

Encoders

Logic Family

74C

Number Of Bits

Number Of Lines (input / Output)

8 / 5

Propagation Delay Time

150 ns at 5V, 80 ns at 10V, 60 ns at 15V

Supply Voltage - Max

15 V

Supply Voltage - Min

3 V

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Package / Case

SOIC-20

Minimum Operating Temperature

- 40 C

Number Of Input Lines

Number Of Output Lines

Power Dissipation

700 mW

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MM74C922WM

MM74C922N

MM74C923WM

MM74C923N

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.

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.

Ordering Code:

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

MM74C922

Top View

M20B

N18B

N20A

on resistance to be used. No

20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

18-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 Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

DS006037

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 April 2001

www.fairchildsemi.com

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