TC74HC697AF 查看數據表（PDF） - Toshiba
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TC74HC697AF Datasheet PDF : 13 Pages
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TC74HC697AP/AF
Truth Table
CCLR
X
L
H
H
H
H
H
H
X
X
Inputs
LOAD ENP ENT CCK U/D RCK R/C G
X
X
X
X
X
X
X
H
X
X
X
X
X
X
L
L
L
X
X
X
X
L
L
H
H
X
X
X
L
L
H
X
H
X
X
L
L
H
L
L
H
X
L
L
H
L
L
L
X
L
L
X
X
X
X
X
L
L
X
X
X
X
X
H
L
X
X
X
X
X
H
L
Outputs
QA QB QC QD
Z
Z
Z
Z
L
L
L
L
a
b
c
d
No Change
Count Up
Count Down
No Change
a’
b’
c’
d’
No Change
X: Don’t care
Z: High impedance
a~d: The level of steady state inputs at inputs A through D respectively.
a’~d’: The level of steady state outputs at internal counter outputs QA’ through QD’ respectively.
RCO = ( UP ⋅ QA ⋅ QB ⋅ QC ⋅ QD ⋅ENT+ UP ⋅ QA ⋅ QB ⋅ QC ⋅ QD ⋅ENT )
Function
Z
Clear Counter
Load Counter
No Count
Count
Count
No Count
Load Register
No Count
3
2014-03-01
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