HD74LS273

Rev.3.00, Jul.15.2005, page 2 of 6

Function Table

Inputs

Output

Clear

Clock

D

Q

L

X

X

L

H

↑

H

H

H

↑

L

L

H

L

X

Notes: H; high level, L; low level, X; irrelevant

↑; transition from low to high level

Block Diagram

Clock (1)

Clear (2)

1Q

2Q

3Q

4Q

5Q

6Q

7Q

8Q

1D

2D

3D

4D

5D

6D

7D

8D

Clear

D

CK

Q

Clear

D

CK

Q

Clear

D

CK

Q

Clear

D

CK

Q

Clear

D

CK

Q

Clear

D

CK

Q

Clear

D

CK

Q

Clear

D

CK

Q

Absolute Maximum Ratings

Item

Symbol

Ratings

Unit

Supply voltage

7

V

Input voltage

7

V

Power dissipation

400

mW

Storage temperature

Tstg

–65 to +150

°C

Note:

Voltage value, unless otherwise noted, are with respect to network ground terminal.

Recommended Operating Conditions

Item

Symbol

Min

Typ

Max

Unit

Supply voltage

4.75

5.00

5.25

V

—

—

–400

µA

Output current

—

—

8

mA

Operating temperature

Topr

–20

25

75

°C

Clock frequency

0

—

30

MHz

Clock pulse width

20

—

—

ns

Clear pulse width

20

—

—

ns

Data setup time

20

↑

—

—

ns

Clear (inactive-state) setup time

25

↑

—

—

ns

Data hold time

5

↑

—

—

ns