12-BIT ASYNCHRONOUS BINARY COUNTERS

DESCRIPTION

The U74HC4040 is a 12-stage asynchronous binary counter with

a clock input (CLK), an overriding asynchronous master reset input

(CLR) and twelve parallel outputs (Q0 to Q11). The counter

advances on the High to Low transition of CLK. A HIGH on CLR

clears all counter stages and forces all outputs Low, independent of

the state of CLK. Each counter stage is a static toggle flip-flop.

Inputs include clamp diodes that enable the use of current limiting

resistors to interface inputs to voltages in excess of VCC.

FEATURES

* Wide Operating Voltage Range of 4.5V to 5.5V

* Low Power Consumption, 8μA Maximum ICC

* ±4mA Output Drive at 5V