HD74LS390 Datasheet, PDF (3/6 Pages) Hitachi Semiconductor – Dual Decade Counters

HD74LS390
Block Diagram (1/2)
A
Inputs
B
Clear
Input
QA
T
Clear
QB
T
QB
Clear
QA
QB
Outputs
QC
QC
T
QC
Clear
QD
QD
T
QD
Clear
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
V_CC
7
Input voltage
Clear
V_IN
7
A, B
V_IN
5.5
Power dissipation
P_T
400
Storage temperature
Tstg
–65 to +150
Operating temperature
Topr
–20 to +75
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Count frequency
Pulse width
Clear setup time
A input
B input
A input
B input
Clear
Symbol
V_CC
I_OH
I_OL
Topr
ƒ_count
t_w
t_su
Min
4.75
—
—
–20
0
0
20
25
20
25↓
Typ
Max
5.00
5.25
—
–400
—
8
25
75
—
25
—
20
—
—
—
—
—
—
—
—
Unit
V
V
mW
°C
°C
Unit
V
µA
mA
°C
MHz
ns
ns
Rev.4.00, May 10, 2006, page 3 of 5