HD74LS78A

Rev.3.00, Jul.22.2005, page 2 of 6

Block Diagram (1/2)

Clock

To Other F·F

J

K

Q

Q

Clear

Preset

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

–20

25

75

°C

Clock frequency

0

—

30

MHz

Clock High

20

—

—

Pulse width

Clear Preset Low

25

—

—

ns

“H” Data

20

↓

—

—

Setup time

“L” Data

20

↓

—

—

ns

Hold time

0

↓

—

—

ns