The 74F161A, 74F163A 4-bit binary counters are produced by Philips Semiconductors. They feature synchronous counting and loading, two count enable inputs, positive edge-triggered clock, asynchronous master reset (74F161A) and synchronous reset (74F163A), high speed synchronous expansion, typical count rate of 130MHz and industrial range (-40°C to +85°C).
This document provides a product specification for the Philips 74F161A and 74F163A, which are 4-bit binary counters designed for high-speed counting applications. These integrated circuits feature internal carry look-ahead logic and synchronous operation to facilitate fast serial cascading.
| Maximum count rate | 130MHz |
|---|---|
| Operating temperature (Industrial) | -40 to +85 °C |
| Supply voltage (Commercial) | 5V ±10% |
| Supply voltage (Industrial) | 5V ±10% |
The 74F161A has an asynchronous Master Reset, while the 74F163A features a synchronous Reset.
Counting occurs only when both Count Enable inputs, CEP and CET, are at a High level.
The typical maximum clock frequency for these counters is 130MHz.