SL74HC393

System Logic

Semiconductor

SLS

Dual 4-Stage Binary Ripple Counter

High-Performance Silicon-Gate CMOS

The SL74HC393 is identical in pinout to the LS/ALS393. The device

inputs are compatible with standard CMOS outputs; with pullup

resistors, they are compatible with LS/ALSTTL outputs.

This device consists of two independent 4-bit binary ripple

counters with parallel outputs from each counter stage. A

÷256 counter

can be obtained by cascading the two binary counters.

Internal flip-flops are triggered by high-to-low transitions of the

clock input. Reset for the counters is asynchronous and active-high.

State changes of the Q outputs do not occur simultaneously becaue of

internal ripple delays. Therefore, decoded output signals are subject to

decoding spikes and should not be used as clocks or as strobes except

when gated with the Clock of the SL74HC393.

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 2.0 to 6.0 V

• Low Input Current: 1.0 µA

• High Noise Immunity Characteristic of CMOS Devices

ORDERING INFORMATION

SL74HC393N Plastic

SL74HC393D SOIC

° to 125° C for all packages

LOGIC DIAGRAM

PIN 7 = GND

PIN ASSIGNMENT

FUNCTION TABLE

Inputs

Outputs

Clock

Reset

X

H

L

H

L

No Change

L

L

No Change

L

No Change

L

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State

X = don’t care