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DM7490A Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. DM7490A
Description  Decade and Binary Counters
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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 2 page
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www.fairchildsemi.com
2
Function Tables
BCD Count Sequence (Note 1)
BCD Bi-Quinary (5-2) (Note 2)
Reset/Count Function Table
H
= HIGH Level
L
= LOW Level
X
= Don’t Care
Note 1: Output QA is connected to input B for BCD count.
Note 2: Output QD is connected to input A for bi-quinary count
Logic Diagram
The J and K inputs shown without connection are for reference only and
are functionally at a HIGH level.
Count
Outputs
QD
QC
QB
QA
0
L
LLL
1L
L
L
H
2L
L
H
L
3L
L
H
H
4L
H
L
L
5L
H
L
H
6L
H
H
L
7L
H
H
H
8
H
LLL
9H
L
L
H
Count
Outputs
QA
QD
QC
QB
0
L
LLL
1L
L
L
H
2L
L
H
L
3L
L
H
H
4L
H
L
L
5
H
LLL
6H
L
L
H
7H
L
H
L
8H
L
H
H
9H
H
L
L
Reset Inputs
Outputs
R0(1)
R0(2)
R9(1)
R9(2)
QD
QC
QB
QA
H
H
L
X
LLLL
H
H
X
L
LLLL
XX
H
H
H
L
L
H
X
L
X
L
COUNT
L
X
L
X
COUNT
L
X
X
L
COUNT
X
L
L
X
COUNT




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