DM74LS90M 查看數據表（PDF） - Fairchild Semiconductor
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DM74LS90M Datasheet PDF : 6 Pages
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Electrical Characteristics (Continued)
Note 8: QA outputs are tested at IOL = Max plus the limit value of IIL for the B input. This permits driving the B input while maintaining full fan-out capability.
Note 9: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 10: ICC is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V and all other inputs grounded.
Switching Characteristics at VCC = 5V and TA = 25°C
Symbol
Parameter
fMAX
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPHL
Maximum Clock
Frequency
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
From (Input)
To (Output)
A to QA
B to QB
A to QA
A to QA
A to QD
A to QD
B to QB
B to QB
B to QC
B to QC
B to QD
B to QD
SET-9 to QA, QD
SET-9 to QB, QC
SET-0 to Any Q
RL = 2 kΩ
CL = 15 pF
CL = 50 pF
Min
Max
Min
Max
32
20
16
10
16
20
18
24
48
52
50
60
16
23
21
30
32
37
35
44
32
36
35
44
30
35
40
48
40
52
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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