DM74LS251CW Ver la hoja de datos (PDF) - Fairchild Semiconductor
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DM74LS251CW Datasheet PDF : 6 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
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
tPZH
Output Enable Time to
HIGH Level Output
tPZL
Output Enable Time to
LOW Level Output
tPHZ
Output Disable Time from
HIGH Level Output (Note 6)
tPLZ
Output Disable Time from
LOW Level Output (Note 6)
tPZH
Output Enable Time to
HIGH Level Output
tPZL
Output Enable Time to
LOW Level Output
tPHZ
Output Disable Time from
HIGH Level Output (Note 6)
tPLZ
Output Disable Time from
LOW Level Output (Note 6)
Note 6: CL = 5 pF
From (Input)
to (Output)
A, B, C
(4 Levels) to Y
A, B, C
(4 Levels) to Y
A, B, C
(3 Levels) to W
A, B, C
(3 Levels) to W
D to Y
D to Y
D to W
D to W
Strobe to Y
Strobe to Y
Strobe to Y
Strobe to Y
Strobe to W
Strobe to W
Strobe to W
Strobe to W
RL = 667Ω
CL = 45 pF
CL = 150 pF
Min
Max
Min
Max
45
53
45
53
33
38
33
42
28
35
28
38
15
25
15
25
45
60
40
51
45
25
27
40
40
47
55
25
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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