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MC74F779N
8-BIT BIDIRECTIONAL BINARY COUNTER (3-STATE)
8-BIT BIDIRECTIONAL
BINARY COUNTER (3-STA TE)The MC74F779 is a fully synchronous 8-stage up/down counter with multi-
plexed 3-state I/O ports for bus-oriented applications. All control functions
(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 is not recommended for use as a clock or asynch-
ronous reset due to the possibility of decoding spikes. 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
I/O0
I/O1 CET VCC TC S1S0 OE
I/O2 I/O3 GND I/O4 I/O5 I/O6 I/O7
PIN ASSIGNMENT
LOGIC SYMBOL 3 4 5 6 7 8 9 10
GUARANTEED OPERATING RANGES
