HD74HC590

8-bit Binary Counter/Register (with 3-state outputs)

Description

This device each contains an 8-bit binary counter that feeds an 8-bit storage register. The storage register

has parallel outputs. Separate clocks are provided for both the binary counter and storage register. The

binary counter features a direct clear input

CCLR and a count enable input CCKEN. For cascading a ripple

carry output

RCO is provided. Expansion is easily accomplished by tying RCO of the first stage to CCKEN

of the second stage, etc.

Both the counter and register clocks are positive-edge triggered. If the user wishes to connect both clocks

together, the counter state will always be one count ahead of the register, Internal circuitry prevents

clocking from the clock enable.

Features

• High Speed Operation: t

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: I