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74F779 Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. 74F779
Description  8-Bit Bidirectional Binary Counter with 3-STATE Outputs
Download  7 Pages
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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74F779 Datasheet(HTML) 2 Page - Fairchild Semiconductor

   
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2
Unit Loading/Fan Out
Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
 = LOW-to-HIGH Clock Transition
(Not LL) means S0 and S1 should never both be LOW level at the same time.
Pin Names
Description
U.L.
Input IIH/IIL
HIGH/LOW
Output IOH/IOL
I/O0–I/O7
Data Inputs
0.25/0.33
5
µA/−0.2 mA
Data Outputs
75/15 (12.5)
−3 mA/24 mA (20 mA)
S0, S1
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
S1
S0
CET
OE
CP
Function
XXX
H
X
I/O0 to I/O7 in High Z
X
X
X
L
X
Flip-Flop Outputs Appear on I/O Lines
LL
X
H

Parallel Load All Flip-Flops
(Not LL)
H
X

Hold (TC Held HIGH)
HL
L
X

Count Up
LH
L
X

Count Down


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