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-ori-
ented applications. It features a preset capability for pro-
grammable 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 initi-
ated 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
Devices also available in Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?tot he ordering code.
Logic Symbol
Connection Diagram
漏 1999 Fairchild Semiconductor Corporation
DS009568
www.fairchildsemi.com