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74F579 データシート(PDF) 2 Page - Fairchild Semiconductor

部品番号 74F579
部品情報  8-Bit Bidirectional Binary Counter with 3-STATE Outputs
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74F579 データシート(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 = CS and PE should never both be LOW voltage level at the same time.
Pin Names
Description
U.L.
Input IIH/IIL
HIGH/LOW
Output IOH/IOL
I/O0–I/O7
Data Inputs or
3.5/0.333
70
µA/−0.2 mA
3-STATE Outputs
75/15
−3 mA/24 mA
PE
Parallel Enable Input (Active LOW)
0.25/0.333
5
µA/−0.2 mA
U/D
Up-Down Count Control Input
0.25/0.333
5
µA/−0.2 mA
MR
Master Reset Input (Active LOW)
0.25/0.333
5
µA/−0.2 mA
SR
Synchronous Reset Input (Active LOW)
0.25/0.333
5
µA/−0.2 mA
CEP
Count Enable Parallel Input (Active LOW)
0.25/0.333
5
µA/−0.2 mA
CET
Count Enable Trickle Input (Active LOW)
0.25/0.333
5
µA/−0.2 mA
CS
Chip Select Input Active (Active LOW)
0.25/0.333
5
µA/−0.2 mA
OE
Output Enable Input (Active LOW)
0.25/0.333
5
µA/−0.2 mA
CP
Clock Pulse Input (Active Rising Edge)
0.25/0.333
5
µA/−0.2 mA
TC
Terminal Count Output (Active LOW)
25/12.5
−1 mA/5 mA
MR
SR
CS
PE
CEP CET U/D
OE
CP
Function
X
X
H
X
XXX
XX
I/Oa to I/Oh in High Z (PE Disabled)
X
X
L
H
XXX
H
X
I/Oa to I/Oh in High Z
X
X
L
H
X
X
X
L
X
Flip-Flop Outputs Appear on I/O Lines
L
X
X
X
X
X
X
X
X
Asynchronous Reset for all Flip-Flops
H
L
XX
XXX
X

Synchronous Reset for all Flip-Flops
H
H
L
L
XXX
X

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

Hold
H
H
(Not LL)
X
H
X
X

Hold (TC Held HIGH)
H
H
(Not LL)
L
L
H
X

Count Up
H
H
(Not LL)
L
L
L
X

Count Down


同様の部品番号 - 74F579

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同様の説明 - 74F579

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