Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage (Reset)
7V
Input Voltage (A or B)
5 5V
Operating Free Air Temperature Range
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
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
VCC Supply Voltage
VIH High Level Input Voltage
VIL Low Level Input Voltage
IOH High Level Output Current
IOL Low Level Output Current
fCLK
Clock Frequency (Note 1)
fCLK
Clock Frequency (Note 2)
tW Pulse Width (Note 1)
tW Pulse Width (Note 2)
tREL
Reset Release Time (Note 1)
tREL
Reset Release Time (Note 2)
TA Free Air Operating Temperature
Note 1 CL e 15 pF RL e 2 kX TA e 25 C and VCC e 5V
Note 2 CL e 50 pF RL e 2 kX TA e 25 C and VCC e 5V
A to QA
B to QB
A to QA
B to QB
A
B
Reset
A
B
Reset
DM74LS90
Min Nom Max
4 75 5
5 25
2
08
b0 4
8
0 32
0 16
0 20
0 10
15
30
15
25
50
25
25
35
0 70
’LS90 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 1)
Max
VI
VOH
VOL
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
VCC e Min IOL e Max
VIL e Max VIH e Min
(Note 4)
b1 5
27 34
0 35 0 5
IOL e 4 mA VCC e Min
II
Input Current Max
VCC e Max VI e 7V
Reset
Input Voltage
VCC e Max
A
VI e 5 5V
B
0 25 0 4
01
02
04
Units
V
V
V
mA
mA
MHz
MHz
ns
ns
ns
ns
C
Units
V
V
V
mA
2
