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DM74LS90
Absolute Maximum Ratings(Note 4)
Note 4: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. 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
Note 5: C
L
= 15 pF, R
L
= 2 kΩ, T
A
= 25°C and V
CC
= 5V.
Note 6: C
L
= 50 pF, R
L
= 2 kΩ, T
A
= 25°C and V
CC
= 5V.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 7: All typicals are at V
CC
= 5V, T
A
= 25°C.
Supply Voltage 7V
Input Voltage (Reset) 7V
Input Voltage (A or B) 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.75 5 5.25 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current −0.4 mA
I
OL
LOW Level Output Current 8 mA
f
CLK
Clock Frequency (Note 5) A to Q
A
032MHz
B to Q
B
016
f
CLK
Clock Frequency (Note 6) A to Q
A
020MHz
B to Q
B
010
t
W
Pulse Width (Note 5) A 15
B30 ns
Reset 15
t
W
Pulse Width (Note 6) A 25
B50 ns
Reset 25
t
REL
Reset Release Time (Note 5) 25 ns
t
REL
Reset Release Time (Note 6) 35 ns
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 7)
V
I
Input Clamp Voltage V
CC
= Min, I
I
= −18 mA −1.5 V
V
OH
HIGH Level V
CC
= Min, I
OH
= Max
2.7 3.4 V
Output Voltage V
IL
= Max, V
IH
= Min
V
OL
LOW Level V
CC
= Min, I
OL
= Max
(Note 8)
VOutput Voltage V
IL
= Max, V
IH
= Min 0.35 0.5
I
OL
= 4 mA, V
CC
= Min 0.25 0.4
I
I
Input Current @ Max V
CC
= Max, V
I
= 7V Reset 0.1
mAInput Voltage V
CC
= Max A 0.2
V
I
= 5.5V B 0.4
I
IH
HIGH Level V
CC
= Max, V
I
= 2.7V Reset 20
µAInput Current A 40
B80
I
IL
LOW Level V
CC
= Max, V
I
= 0.4V Reset −0.4
mAInput Current A −2.4
B −3.2
I
OS
Short Circuit Output Current V
CC
= Max (Note 9) −20 −100 mA
I
CC
Supply Current V
CC
= Max (Note 7) 9 15 mA
