MM74HC161M

同步二进制计数器具有异步清零同步二进制计数器，同步清除 Synchronous Binary Counter with Asynchronous Clear Synchronous Binary Counter with Synchronous Clear

General Description

The MM74HC161 and MM74HC163 synchronous presettable counters utilize advanced silicon-gate CMOS technology and internal look-ahead carry logic for use in high speed counting applications. They offer the high noise immunity and low power consumption inherent to CMOS with speeds similar to low power Schottky TTL. The HC161 and the HC163 are 4 bit binary counters. All flip-flops are clocked simultaneously on the LOW-to-HIGH transition positive edge of the CLOCK input waveform.

These counters may be preset using the LOAD input. Presetting of all four flip-flops is synchronous to the rising edge of CLOCK. When LOAD is held LOW counting is disabled and the data on the A, B, C, and D inputs is loaded into the counter on the rising edge of CLOCK. If the load input is taken HIGH before the positive edge of CLOCK the count operation will be unaffected.

All of these counters may be cleared by utilizing the CLEAR input. The clear function on the MM74HC163 counter is synchronous to the clock. That is, the counters are cleared on the positive edge of CLOCK while the clear input is held LOW.

Features

■ Typical operating frequency: 40 MHz

■ Typical propagation delay; clock to Q: 18 ns

■ Low quiescent current: 80 µA maximum 74HC Series

■ Low input current: 1 µA maximum

■ Wide power supply range: 2–6V