M74HC390 Ver la hoja de datos (PDF) - STMicroelectronics
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M74HC390 Datasheet PDF : 13 Pages
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M54/M74HC390
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
COUNT
0
1
2
3
4
5
6
7
8
9
OUTPUTS
BCD COUNT *
BI-QUINARY **
QD
QC
QB
QA
QA
QD
QC
QB
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
H
L
L
H
L
L
L
H
L
L
L
H
H
L
L
H
H
L
H
L
L
L
H
L
L
L
H
L
H
H
L
L
L
L
H
H
L
H
L
L
H
L
H
H
H
H
L
H
L
H
L
L
L
H
L
H
H
H
L
L
H
H
H
L
L
INPUTS
CLOCK A
CLOCK B
CLEAR
X
X
H
X
L
X
L
Note: * Output QA is connected to input CLOCK B for BCD count.
** Output QD is connected to input CLOCK A for bi-quinary count.
OUTPUTS
QA
QB
QC
QD
L
L
L
L
BINARY COUNT UP
QUINARY COUNT UP
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