74F579

74F579 8-Bit Bidirectional Binary Counter with 3-STATE Outputs April 1988 Revised August 1999 74F579 8-Bit Bidirectional Binary Counter with 3-STATE Outputs General Description The 74F579 is a fully synchronous 8-stage up/down counter with multiplexed 3-STATE I/O ports for bus-oriented applications. It features a preset capability for programmable operation, carry lookahead for easy cascading and a U/D input to control the direction of counting. All state changes, whether in counting or parallel loading, are initiated by the rising edge of the clock. Features s Multiplexed 3-STATE I/O ports s Built-in lookahead carry capability s Count frequency 100 MHz typical s Supply current 75 mA typical s Guaranteed 4000V minimum ESD protection Ordering Code: Order Number 74F579SC 74F579SJ 74F579PC Package Number M20B M20D N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” tot he ordering code. Logic Symbol Connection Diagram © 1999 Fairchild Semiconductor Corporation DS009568 www.fairchildsemi.com 74F579 Unit Loading/Fan Out Pin Names I/O0–I/O7 PE U/D MR SR CEP CET CS OE CP TC Description Data Inputs or 3-STATE Outputs Parallel Enable Input (Active LOW) Up-Down Count Control Input Master Reset Input (Active LOW) Syn...