© 2000 Fairchild Semiconductor Corporation DS009593 www.fairchildsemi.com
April 1988
Revised March 2000
7
4F779 8-Bi
t Bidi
rect
iona
l Binar
y
Count
er wit
h

3-
ST
A
T
E Output
s
74F779
8-Bit Bidirectional Binary Counter with 3-STATE Outputs
General Description
The 74F779 is a fully synchronous 8-stage up/down
counter with multiplexed 3-STATE I/O ports for bus-ori-
ented applications. All control functions (hold, count up,
count down, synchronous load) are controlled by two mode
pins (S
0
, S
1
). The device also features carry lookahead for
easy cascading. All state changes are initiated by the rising
edge of the clock.
Features
a73 Multiplexed 3-STATE I/O ports
a73 Built-in lookahead carry capability
a73 Count frequency 100 MHz typ
a73 Supply current 80 mA typ
a73 Available in SOIC (300 mil only)

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol Connection Diagram
Order Number Package Number Package Description
74F779SC M16B 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F779PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide