74LS645 查看數據表（PDF） - Fairchild Semiconductor
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74LS645 Datasheet PDF : 5 Pages
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Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol
Parameter
tPLH
Propagation Delay Time
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
HIGH-to-LOW Level Output
tPZL
Output Enable Time
to LOW Level
tPZH
Output Enable Time
to HIGH Level
tPZL
Output Enable Time
to LOW Level
tPZH
Output Enable Time
to HIGH Level
tPLZ
Output Disable Time
to LOW Level
tPHZ
Output Disable Time
to HIGH Level
tPLZ
Output Disable Time
to LOW Level
tPHZ
Output Disable Time
to HIGH Level
From (Input)
To (Output)
A to B
A to B
B to A
B to A
G to A
G to A
G to B
G to B
G to A
G to A
G to B
G to B
RL = 667Ω
CL = 45 pF
CL = 5 pF
Min
Max
Min
Max
15
15
15
15
40
40
40
40
25
25
25
25
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3
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