HD74LS78A Datasheet, PDF (2/7 Pages) Hitachi Semiconductor – Dual J-K Flip-Flops(with Preset, Common Clear, and Common Clock)

HD74LS78A
Block Diagram (1/2)
Q
Preset
K
Clock
Q
Clear
J
To Other F·F
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
VCC
7
Input voltage
VIN
7
Power dissipation
PT
400
Storage temperature
Tstg
–65 to +150
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Clock frequency
Pulse width
Clock High
Clear Preset Low
Setup time
“H” Data
“L” Data
Hold time
Symbol
VCC
IOH
IOL
Topr
fclock
tw
tw
tsu
tsu
th
Min
4.75
—
—
–20
0
20
25
20↓
20↓
0↓
Typ
5.00
—
—
25
—
—
—
—
—
—
Max
5.25
–400
8
75
30
—
—
—
—
—
Unit
V
V
mW
°C
Unit
V
µA
mA
°C
MHz
ns
ns
ns
Rev.3.00, Jul.22.2005, page 2 of 6