September 1983

Revised February 1999

© 1999 Fairchild Semiconductor Corporation

DS005337.prf

www.fairchildsemi.com

MM74HC393

Dual 4-Bit Binary Counter

General Description

The MM74HC393 counter circuits contain independent rip-

ple carry counters and utilize advanced silicon-gate CMOS

technology. The MM74HC393 contains two 4-bit ripple

carry binary counters, which can be cascaded to create a

single divide-by-256 counter.

Each of the two 4-bit counters is incremented on the HIGH-

to-LOW transition (negative edge) of the clock input, and

each has an independent clear input. When clear is set

HIGH all four bits of each counter are set to a low level.

This enables count truncation and allows the implementa-

tion of divide-by-N counter configurations.

Each of the counters outputs can drive 10 low power

Schottky TTL equivalent loads. This counter is functionally

as well as pin equivalent to the 74LS393. All inputs are pro-

tected from damage due to static discharge by diodes to

Features

s Typical operating frequency: 50 MHz

s Wide operating supply voltage range: 2–6V

s Low input current:

<1 µA

s Low quiescent supply current: 80

µA maximum (74HC

Series)

s Fanout of 10 LS-TTL loads

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Pin Assignments for DIP, SOIC, SOP and TSSOP

Top View

Order Number

Package Number

Package Description

MM74HC393M

M14A

14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow

MM74HC393SJ

M14D

14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

MM74HC393MTC

MTC14

14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

MM74HC393N

N14A

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