MM74C90N データシートの表示（PDF） - Fairchild Semiconductor

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MM74C90N

4-Bit Decade Counter • 4-Bit Binary Counter

Fairchild Semiconductor 

October 1987

Revised January 1999

MM74C90 • MM74C93

4-Bit Decade Counter • 4-Bit Binary Counter

General Description

The MM74C90 decade counter and the MM74C93 binary

counter and complementary MOS (CMOS) integrated cir-

cuits constructed with N- and P-channel enhancement

mode transistors. The 4-bit decade counter can reset to

zero or preset to nine by applying appropriate logic level on

the R01, R02, R91 and R92 inputs. Also, a separate flip-flop

on the A-bit enables the user to operate it as a divide-by-2,

5 or 10 frequency counter. The 4-bit binary counter can be

reset to zero by applying high logic level on inputs R01 and

R02, and a separate flip-flop on the A-bit enables the user

to operate it as a divide-by-2, -8, or -16 divider. Counting

occurs on the negative going edge of the input pulse.

All inputs are protected against static discharge damage.

Features

s Wide supply voltage range: 3V to 15V

s Guaranteed noise margin: 1V

s High noise immunity: 0.45 VCC (typ.)

s Low power compatibility:

Fan out of 2 TTL driving 74L

s The MM74C93 follows the MM74L93 Pinout

Ordering Code:

Order Number

MM74C90N

MM74C93N

Package Number

N14A

N14A

Package Description

14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Connection Diagrams

MM74C90

Pin Assignments for DIP

MM74C93

Top View

Top View

© 1999 Fairchild Semiconductor Corporation DS005889.prf

www.fairchildsemi.com

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