MC74F779

Features:

• Multiplexed 3-State I/O Ports For Bus-oriented Applications
• Built-In Look-Ahead Carry Capability
• Count Frequency 145 MHz Typ
• Supply Current 90 mA Typ
• Fully Synchronous Operation
• Separate Pins for Master Reset and Synchronous Reset
• Center Power Pins to Reduce Effects of Package Inductance
• See F269 for 24-Pin Separate I/O Port Version
• See F579 for 20-Pin Version
• ESD Protection > 4000 Volts


Pinout




Description

The MC74F779 is a fully synchronous 8-stage up/down counter with multiplexed 3-state I/O ports for bus-oriented applications. All control functions of MC74F779 (hold, count up, count down, synchronous load) are controlled by two mode pins (S0, S1). The device also features carry look-ahead for easy cascading. All state changes are initiated by the rising edge of the clock.

When CET is High the data outputs are held in their current state and TC is held high. The TC output of MC74F779 is not recommended for use as a clock or asynchronous reset due to the possibility of decoding spikes.