74F779 Datasheet | Philips Semiconductors

INTEGRATED CIRCUITS 74F779 8-bit bidirectional binary counter (3-State) Product specification IC15 Data Handbook 1989 Sep 20 Philips Semiconductors Philips Semiconductors Product specification 8-bit bidirectional binary counter (3-State) Features - Multiplexed 3-State I/O ports for bus oriented applications - Built-in look-ahead carry capability - Center power pins to reduce effects of package inductance - Count frequency 145MHz typical - Supply current 90m A typical - See 74F269 for 24-pin separate I/O port version - See 74F579 for 20-pin version - See 74F1779 for extended function version of the 74F799 DESCRIPTION The 74F779 is a fully synchronous 8-stage Up/Down Counter with multiplexed 3-State I/O ports for bus-oriented applications. All control functions (hold, count up, count down, synchronous load) are controlled by two mode pine (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 remended for use as a clock or asynchronous reset due to the possibility of decoding spikes. PIN CONFIGURATION I/O1 1 I/O2 I/O3 GND I/O4 I/O5 2 3 4 5 6 16 I/O0 15 CP 14 CET 13 VCC 12 TC 11 S0 10 S1 9 OE I/O6 7 I/O7 8 SF01259 TYPE 74F779 TYPICAL f MAX 145MHz TYPICAL SUPPLY CURRENT (TOTAL) 90m A ORDERING INFORMATION DESCRIPTION 16-Pin Plastic DIP 16-Pin Plastic SOL MERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F779N N74F779D PKG DWG # SOT38-4 SOT 162-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS I/On S0, S1 OE CET CP Data inputs Data outputs Select inputs Output Enable input (active Low) Count Enable Trickle input (active Low) Clock input (active rising edge) DESCRIPTION 74F(U.L.) HIGH/LOW 3.5/1.0 150/40 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1.0 50/33 LOAD VALUE HIGH/LOW 70µA/0.6m A 3.0m A/24m A 20µA/0.6m A 20µA/0.6m A 20µA/0.6m A 20µA/0.6m A 1.0m A/20m A TC Terminal Count...