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74F779PC

P1-P3P4-P6P7-P7
© 2004 Fairchild Semiconductor Corporation DS009593 www.fairchildsemi.com
April 1988
Revised February 2004
74F779 8-Bit Bidirectional Binary Counter with 3-STATE Outputs
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
■ Multiplexed 3-STATE I/O ports
■ Built-in lookahead carry capability
■ Count frequency 100 MHz typ
■ Supply current 80 mA typ
■ Available in SOIC (300 mil only)
Ordering Code:
Logic Symbol Connection Diagram
Order Number Package Number Package Description
74F779SC M16B 16-Lead Small Outline Intergrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74F779PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
www.fairchildsemi.com 2
74F779
Unit Loading/Fan Out
Function Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
= LOW-to-HIGH Clock Transition
(Not LL) means S
0
and S
1
should never both be LOW level at the same time.
Pin Names Description
U.L.
Input I
IH
/I
IL
HIGH/LOW
Output I
OH
/I
OL
I/O
0
–I/O
7
Data Inputs 0.25/0.33 5 µA/−0.2 mA
Data Outputs 75/15 (12.5)
−3 mA/24 mA (20 mA)
S
0
, S
1
Select Inputs 0.25/0.33 5 µA/−0.2 mA
OE
Output Enable Input (Active LOW) 0.25/0.33 5 µA/−0.2 mA
CET
Count Enable Trickle Input (Active LOW) 0.25/0.33 5 µA/−0.2 mA
CP Clock Pulse Input (Active Rising Edge) 0.25/0.33 5
µA/−0.2 mA
TC
Terminal Count Output (Active LOW) 25/12.5 −1 mA/20 mA
S
1
S
0
CET OE CP Function
XXXHXI/O
0
to I/O
7
in High Z
X X X L X Flip-Flop Outputs Appear on I/O Lines
LLXH
Parallel Load All Flip-Flops
(Not LL) H X
Hold (TC Held HIGH)
HLLX
Count Up
LHLX
Count Down
3 www.fairchildsemi.com
74F779
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
P1-P3P4-P6P7-P7

74F779PC

Mfr. #:
Buy 74F779PC
Manufacturer:
ON Semiconductor / Fairchild
Description:
Counter ICs 8-Bit Bidir Bin Ctr
Lifecycle:
New from this manufacturer.
Delivery:
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