DM74LS90M datasheet(6/10 Pages) NSC

Part #	DM74LS90M

Description	Decade and Binary Counters

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Manufacturer	NSC [National Semiconductor (TI)]

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Function Tables

LS90

BCD Count Sequence

(See Note A)

Count

Output

QD

QC

QB

QA

0L

L

1L

L

H

2L

L

H

L

3L

L

H

4L

H

L

5L

H

L

H

6L

H

L

7L

H

8H

L

9H

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

4

LHL

L

5H

L

6H

L

H

7

HLH

L

8

HLH

H

9H

H

L

LS93

Count Sequence

(See Note C)

Count

Output

QD

QC

QB

QA

0L

L

1L

L

H

2L

L

H

L

3L

L

H

4L

H

L

5L

H

L

H

6L

H

L

7L

H

8H

L

9H

L

H

10

H

L

H

L

11

H

L

H

12

H

L

13

H

L

H

14

H

L

15

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

HH

X

L

XX

H

L

H

X

L

X

L

COUNT

L

X

L

X

COUNT

L

X

L

COUNT

X

L

X

COUNT

LS93

ResetCount Truth Table

Reset Inputs

Output

R0(1)

R0(2)

QD

QC

QB

QA

HH

L

X

COUNT

X

L

COUNT

6

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