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SN74F161A - SYNCHRONOUS 4-BIT BINARY COUNTER

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General Description

This synchronous, presettable, 4-bit binary counter has internal carry look-ahead circuitry for use in high-speed counting designs.

A3 B4 C5 D6 ENP 7 14 QA 13 QB 12 QC 11 QD 10 ENT Synchronous operation is provided by having all GND 8 9 LOAD flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable (ENP, ENT) inputs and internal gating.

This mode of operation eliminates the output counting spikes that are normally associated with asynchronous (ripple-clock) counters.

Overview

SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 D Internal Look-Ahead Circuitry for Fast Counting D, DB, OR N PACKAGE (TOP VIEW) D Carry Output for N-Bit Cascading D Fully.

Key Features

  • a fully independent clock circuit. Changes at ENP, ENT, or LOAD that modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the setup and hold times.

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