SN74LS90 datasheet(4/7 Pages) ONSEMI

Part #	SN74LS90

Description	4-BIT BINARY COUNTER

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SN74LS90

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4

LS90

MODE SELECTION

RESET / SET INPUTS

OUTPUTS

MR1 MR2 MS1 MS2

Q0 Q1

Q2 Q3

H

X

L

X

L

X

H

X

L

X

L

X

H

L

X

L

H

L

H

Count

X

L

H

X

L

X

H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care

LS92 AND LS93

MODE SELECTION

RESET

INPUTS

OUTPUTS

MR1 MR2

Q0 Q1

Q2 Q3

H

L

H

L

H

L

LL

Count

H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care

LS90

BCD COUNT SEQUENCE

COUNT

OUTPUT

Q0 Q1

Q2 Q3

0

1

2

3

4

5

6

7

8

9

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

NOTE: Output Q0 is connected to Input

CP1 for BCD count.

LS92

TRUTH TABLE

COUNT

OUTPUT

Q0 Q1

Q2 Q3

0

1

2

3

4

5

6

7

8

9

10

11

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

NOTE: Output Q0 is connected to Input

CP1.

LS93

TRUTH TABLE

COUNT

OUTPUT

Q0 Q1

Q2 Q3

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

NOTE: Output Q0 is connected to Input

CP1.

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

−55

0

25

125

70

°C

IOH

Output Current — High

54, 74

−0.4

mA

IOL

Output Current — Low

54

74

4.0

8.0

mA

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