DM74LS90 Просмотр технического описания (PDF) - Fairchild Semiconductor
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DM74LS90 Datasheet PDF : 6 Pages
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Absolute Maximum Ratings(Note 4)
Supply Voltage
Input Voltage (Reset)
Input Voltage (A or B)
Operating Free Air Temperature Range
Storage Temperature Range
7V
7V
5.5V
0°C to +70°C
−65°C to +150°C
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
Symbol
VCC
VIH
VIL
IOH
IOL
fCLK
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Clock Frequency (Note 5)
fCLK
Clock Frequency (Note 6)
tW
Pulse Width (Note 5)
tW
Pulse Width (Note 6)
tREL
Reset Release Time (Note 5)
tREL
Reset Release Time (Note 6)
TA
Free Air Operating Temperature
Note 5: CL = 15 pF, RL = 2 kΩ, TA = 25°C and VCC = 5V.
Note 6: CL = 50 pF, RL = 2 kΩ, TA = 25°C and VCC = 5V.
A to QA
B to QB
A to QA
B to QB
A
B
Reset
A
B
Reset
Min
4.75
2
0
0
0
0
15
30
15
25
50
25
25
35
0
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
VI
Input Clamp Voltage
VOH
HIGH Level
Output Voltage
VOL
LOW Level
Output Voltage
II
Input Current @ Max
Input Voltage
IIH
HIGH Level
Input Current
VCC = Min, II = −18 mA
VCC = Min, IOH = Max
VIL = Max, VIH = Min
VCC = Min, IOL = Max
VIL = Max, VIH = Min
IOL = 4 mA, VCC = Min
VCC = Max, VI = 7V
VCC = Max
VI = 5.5V
VCC = Max, VI = 2.7V
IIL
LOW Level
Input Current
VCC = Max, VI = 0.4V
IOS
Short Circuit Output Current
ICC
Supply Current
Note 7: All typicals are at VCC = 5V, TA = 25°C.
VCC = Max (Note 9)
VCC = Max (Note 7)
(Note 8)
Reset
A
B
Reset
A
B
Reset
A
B
3
Nom
Max
Units
5
5.25
V
V
0.8
V
−0.4
mA
8
mA
32
MHz
16
20
MHz
10
ns
ns
ns
ns
70
°C
Typ
Min
Max
(Note 7)
−1.5
2.7
3.4
Units
V
V
0.35
0.5
V
0.25
0.4
0.1
0.2
mA
0.4
20
40
µA
80
−0.4
−2.4
mA
−3.2
−20
−100
mA
9
15
mA
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