74F779 查看數據表（PDF） - Fairchild Semiconductor
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74F779 Datasheet PDF : 7 Pages
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Unit Loading/Fan Out
Pin Names
I/O0–I/O7
S0, S1
OE
CET
CP
TC
Description
Data Inputs
Data Outputs
Select Inputs
Output Enable Input (Active LOW)
Count Enable Trickle Input (Active LOW)
Clock Pulse Input (Active Rising Edge)
Terminal Count Output (Active LOW)
U.L.
HIGH/LOW
0.25/0.33
75/15 (12.5)
0.25/0.33
0.25/0.33
0.25/0.33
0.25/0.33
25/12.5
Input IIH/IIL
Output IOH/IOL
5 µA/−0.2 mA
−3 mA/24 mA (20 mA)
5 µA/−0.2 mA
5 µA/−0.2 mA
5 µA/−0.2 mA
5 µA/−0.2 mA
−1 mA/20 mA
Function Table
S1
S0
CET
OE
CP
X
X
X
H
X
X
X
L
L
(Not LL)
H
L
L
H
X
X
H
L
L
L
H
X
X
X
X
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.
Function
I/O0 to I/O7 in High Z
Flip-Flop Outputs Appear on I/O Lines
Parallel Load All Flip-Flops
Hold (TC Held HIGH)
Count Up
Count Down
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