M74HC590 查看數據表（PDF） - STMicroelectronics
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M74HC590 Datasheet PDF : 15 Pages
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M74HC590
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3, 4, 5,
6, 7, 15
11
12
13
9
14
10
8
16
SYMBOL NAME AND FUNCTION
QA to QH Outputs
CCK
CCKEN
RCK
RCO
G
CCLR
GND
VCC
Counter Clock Input
Counter Clock Enable
Input
Register Clock Input
Ripple Carry Output
Output Enable Input
Counter Clear Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
G
RCK
CCLR
CCKEN
CCK
OUTPUT
H
X
X
X
X
L
X
X
X
X
Q OUTPUTS DISABLE
Q OUTPUTS ENABLE
X
X
X
X
COUNTER DATA IS STORED INTO REGISTER
X
X
X
X
X
X
L
X
X
X
X
H
L
REGISTER STAGE IS NOT CHANGED
COUNTER CLEAR
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
2/15
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