DM74LS298(2000) 查看數據表（PDF） - Fairchild Semiconductor
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DM74LS298 Datasheet PDF : 4 Pages
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Absolute Maximum Ratings(Note 1)
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
−65°C to +150°C
Note 1: 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 tables 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
TA
tS (H)
tS (L)
tH (H)
tH (L)
tS (H)
tS (L)
tH (H)
tH (L)
tW (H)
tW (L)
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
Setup Time HIGH or LOW
S to CP
Hold Time HIGH or LOW
S to CP
Setup Time HIGH or LOW
I0x or I1x to CP
Hold Time HIGH or LOW
I0x or I1x to CP
CP Pulse Width HIGH or LOW
Min
Nom
Max
Units
4.75
5
5.25
V
2
V
0.8
V
−0.4
mA
8
mA
0
70
°C
25
ns
25
0
ns
0
15
ns
15
5.0
ns
5.0
20
ns
20
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
Input Clamp Voltage
VCC = Min, II = −18 mA
VOH
HIGH Level Output Voltage
VCC = Min, IOH = Max, VIL = Max
2.7
VOL
LOW Level Output Voltage
VCC = Min, IOL = Max, VIH = Min
IOL = 4 mA, VCC = Min
II
Input Current @ Max Input Voltage
VCC = Max, VI = 7V, VI = 10V
IIH
HIGH Level Input Current
VCC = Max, VI = 2.7V
IIL
LOW Level Input Current
VCC = Max, VI = 0.4V
IOS
Short Circuit Output Current
VCC = Max (Note 3)
−20
ICC
Supply Current
VCC = Max, I0n, I1n,
S = GND, CP =
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Typ
(Note 2)
3.4
0.35
0.25
Max
−1.5
0.5
0.4
0.1
20
−0.4
−100
21
Units
V
V
V
mA
µA
mA
mA
mA
Switching Characteristics
at VCC = +5V and TA = +25°C
Symbol
Parameter
tPLH
Propagation Delay Time
LOW-to-HIGH Level Output
CP to Qn
tPHL
Propagation Delay Time
HIGH-to-LOW Level Output
CP to Qn
RL = 2 kΩ, CL = 15 pF
Min
Max
25
25
Units
ns
ns
3
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