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Supply Voltage

7V

Input Voltage (Reset)

7V

Input Voltage (A or B)

55V

Operating Free Air Temperature Range

DM74LS

Storage Temperature Range

b

Note

The ‘‘Absolute Maximum Ratings’’ are those values

beyond which the safety of the device cannot be guaran-

teed The device should not be operated at these limits The

parametric values defined in the ‘‘Electrical Characteristics’’

table are not guaranteed at the absolute maximum ratings

The ‘‘Recommended Operating Conditions’’ table will define

the conditions for actual device operation

Recommended Operating Conditions

Symbol

Parameter

DM74LS90

Units

Min

Nom

Max

Supply Voltage

475

5

525

V

High Level Input Voltage

2

V

Low Level Input Voltage

08

V

High Level Output Current

b

04

mA

Low Level Output Current

8

mA

Clock Frequency (Note 1)

032

MHz

016

Clock Frequency (Note 2)

020

MHz

010

Pulse Width (Note 1)

A

15

B30

ns

Reset

15

Pulse Width (Note 2)

A

25

B50

ns

Reset

25

Reset Release Time (Note 1)

25

ns

Reset Release Time (Note 2)

35

ns

Free Air Operating Temperature

0

70

C

Note 1

Note 2

’LS90 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

(Note 1)

Input Clamp Voltage

b

15

V

High Level Output

27

34

V

Voltage

Low Level Output

Voltage

035

05

V

(Note 4)

025

04

Input Current

Max

Reset

01

Input Voltage

A

02

mA

B

04

2