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Supply Voltage

7V

Input Voltage

7V

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

DM74LS221

Units

Min

Nom

Max

Supply Voltage

475

5

525

V

Positive-Going Input Threshold Voltage

12

V

Negative-Going Input Threshold Voltage

08

1

V

Positive-Going Input Threshold Voltage

12

V

Negative-Going Input Threshold Voltage

08

09

V

High Level Output Current

b

04

mA

Low Level Output Current

8

mA

Pulse Width

Data

40

ns

(Note 1)

Clear

40

Clear Release Time (Note 1)

15

ns

dV

dt

Rate of Rise or Fall of

1

V

s

Schmitt Input (B) (Note 1)

dV

dt

Rate of Rise or Fall of

1

V

m

s

Logic Input (A) (Note 1)

External Timing Resistor (Note 1)

14

100

kX

External Timing Capacitance (Note 1)

0

1000

m

F

DC

Duty Cycle

50

%

(Note 1)

60

Free Air Operating Temperature

0

70

C

Note 1

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

035

05

Voltage

V

04

Input Current

Max

01

mA

Input Voltage

2