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M74HC590C1R
8 BIT BINARY COUNTER REGISTER (3 STATE)
STMicroelectronics
M74HC590C1R Datasheet PDF : 14 Pages
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M54/M74HC590
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
INPUTS
G
RCK
CCLR CCKEN
CCK
OUTPUT
H
X
X
X
X
Q OUTPUTS DISABLE
L
X
X
X
X
Q OUTPUTS ENABLE
X
X
X
X
COUNTER DATA IS STORED INTO REGISTER
X
X
X
X
REGISTER STATE IS NOT CHANGED
X
X
L
X
X
COUNTER CLEAR
X
X
H
L
ADVANCE ONE COUNT
X
X
H
L
NO COUNT
X
X
H
H
X
NO COUNT
X: DON’T CARE
RCO = QA’
•
QB’
•
QC’
•
QD’
•
QE’
•
QF’
•
QG’
•
QH’ (QA’ to QH’: INTERNAL OUTPUTS OF THE COUNTER)
LOGIC DIAGRAM
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