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DM74LS90M Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza DM74LS90M
Descripción Electrónicos  Decade and Binary Counters
PDF  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM74LS90M Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Function Tables
LS90
BCD Count Sequence
(See Note A)
Count
Output
QD
QC
QB
QA
0L
L
L
L
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
8H
L
L
L
9H
L
L
H
LS90
Bi-Quinary (5-2)
(See Note B)
Count
Output
QA
QD
QC
QB
0
LLL
L
1
LLL
H
2L
L
H
L
3L
L
H
H
4
LHL
L
5H
L
L
L
6H
L
L
H
7
HLH
L
8
HLH
H
9H
H
L
L
LS93
Count Sequence
(See Note C)
Count
Output
QD
QC
QB
QA
0L
L
L
L
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
8H
L
L
L
9H
L
L
H
10
H
L
H
L
11
H
L
H
H
12
H
H
L
L
13
H
H
L
H
14
H
H
H
L
15
H
H
H
H
Note A
Output QA is connected to input B for BCD count
Note B
Output QD is connected to input A for bi-quinary count
Note C
Output QA is connected to input B
Note D
H e High Level L e Low Level X e Don’t Care
LS90
ResetCount Truth Table
Reset Inputs
Output
R0(1)
R0(2)
R9(1)
R9(2)
QD
QC
QB
QA
HH
L
X
L
L
L
L
HH
X
L
L
L
L
L
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
LS93
ResetCount Truth Table
Reset Inputs
Output
R0(1)
R0(2)
QD
QC
QB
QA
HH
L
L
L
L
L
X
COUNT
X
L
COUNT
6



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