M74HC390 STMICROELECTRONICS [STMicroelectronics], M74HC390 Datasheet - Page 2
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M74HC390
Manufacturer Part Number
M74HC390
Description
DUAL DECADE COUNTER
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.M74HC390.pdf
(13 pages)
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M54/M74HC390
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
Note: * Output QA is connected to input CLOCK B for BCD count.
2/13
** Output QD is connected to input CLOCK A for bi-quinary count.
CLOCK A
COUNT
X
X
0
1
2
3
4
5
6
7
8
9
QD
H
H
L
L
L
L
L
L
L
L
CLOCK B
INPUTS
X
X
BCD COUNT *
QC
H
H
H
H
L
L
L
L
L
L
QB
H
H
H
H
L
L
L
L
L
L
CLEAR
H
L
L
QA
H
H
H
H
H
L
L
L
L
L
OUTPUTS
QA
QA
H
H
H
H
H
L
L
L
L
L
L
QUINARY COUNT UP
BINARY COUNT UP
BI-QUINARY **
QD
QB
H
H
L
L
L
L
L
L
L
L
L
OUTPUTS
QC
QC
H
H
H
H
L
L
L
L
L
L
L
QB
QD
H
H
H
H
L
L
L
L
L
L
L