HD74LS390FPEL データシートの表示（PDF） - Renesas Electronics
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HD74LS390FPEL Datasheet PDF : 6 Pages
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HD74LS390
Function Table
BCD Count Sequence (Notes 1)
Count
Outputs
QD
QC
QB
QA
0
L
L
L
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
5
L
H
L
H
6
L
H
H
L
7
L
H
H
H
8
H
L
L
L
9
H
L
L
H
Bi-quinary (Notes 2)
Count
Outputs
QA
QD
QC
QB
0
L
L
L
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
5
H
L
L
L
6
H
L
L
H
7
H
L
H
L
8
H
L
H
H
9
H
H
L
L
Notes: 1. Output QA is connected to input B for BCD count.
2. Output QD is connected to input A for bi-quinary count.
3. H; high level, L; low level, X; irrelevant
Rev.4.00, May 10, 2006, page 2 of 5
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