M54HC690 データシートの表示（PDF） - STMicroelectronics
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M54HC690
STMicroelectronics
M54HC690 Datasheet PDF : 23 Pages
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M54/M74HC690/691/692/693
TRUTH TABLE
INPUTS
OUTPUS
CCLR LOAD ENP ENT CCK RCLR RCK R/C G QA QB QC QD
FUNCTION
X
X
X
X
X
X
X
X X Z Z Z Z HIGH IMPEDANCE
L
X
X
X
(*)
X
X
L L L L L L CLEAR COUNTER
H
L
X
X
X
X
L L a b c d LOAD COUNTER
H
H
L
X
X
X
LL
NO CHANGE
NO COUNT
H
H
X
L
X
X
LL
NO CHANGE
NO COUNT
H
H
H
H
X
X
LL
COUNT UP
COUNT UP
H
X
X
X
X
X
LL
NO CHANGE
NO COUNT
X
X
X
X
X
L
(*)
HLL L
L L CLEAR REGISTER
X
X
X
X
X
H
H L a’ b’ c’ d’ LOAD REGISTER
X
X
X
X
X
H
HL
NO CHANGE
NO LOAD
(*) : X for HC690/691
for HC692/693
X : DON’T CARE
Z : HIGH IMPEDANCE
a-d : THE LEVEL OF STEADY STATE INPUTS AT INPUTS A THROUGHT D RESPECTIVELY.
a’-d’ : THE LEVEL OF STEADY STATE OUTPUTS AT INTERNAL COUNTER OUTPUTS a’ through qd’ respectively
HC690/692 RCO = QA • QD • ENT
HC691/693 RCO = QA • QB • QC • QD • ENT
BLOCK DIAGRAM
3/23
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