74F1779 Datasheet | Philips Semiconductors

INTEGRATED CIRCUITS 74F1779 8-bit bidirectional binary counter (-State) Product specification IC15 Data Handbook 1989 Apr 06 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 74F779 for 16-pin version with abbreviated function table DESCRIPTION The 74F1779 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 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 remended for use as a clock or asynchronous reset due to the possibility of decoding spikes. The 74F1779 differs from 74F779 in that it has an additional hold mode as described in the Function Table. 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 74F1779 TYPICAL f MAX 130MHz TYPICAL SUPPLY CURRENT (TOTAL) 100m A ORDERING INFORMATION DESCRIPTION 16-pin Plastic DIP 16-pin Plastic SOL MERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F1779N N74F1779D PACKAGE DRAWING NUMBER SOT38-4 SOT162-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS I/On S0, S1 OE CET CP TC Data inputs Data outputs Select inputs Output Enable input (active Low) Count Enable Trickle input (active Low) Clock input (active rising edge) Terminal Count output (active Low) DESCRIPTION 74F(U.L.) HIGH/LOW...