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DM74AS257MX View Datasheet(PDF) - Fairchild Semiconductor

Part NameDescriptionManufacturer
DM74AS257MX 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Fairchild
Fairchild Semiconductor Fairchild
DM74AS257MX Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
DM74AS257 Switching Characteristics
Over recommended operating free air temperature range.
Symbol
Parameter
Conditions
From
To Min Max Units
tPLH Propagation Delay Time,
LOW-to-HIGH Level Output
tPHL Propagation Delay Time,
HIGH-to-LOW Level Output
VCC = 4.5V to 5.5V,
Data
Any Y
1
CL = 50 pF,
RL = 500
1
5.5
ns
6
ns
tPLH Propagation Delay Time,
LOW-to-HIGH Level Output
Select Any Y
2
11
ns
tPHL Propagation Delay Time,
HIGH-to-LOW Level Output
2
10
ns
tPZH Output Enable Time to HIGH
Level
OUTPUT Any Y
2
Control
7.5
ns
tPZL Output Enable Time to LOW
Level
2
9.5
ns
tPHZ Output Disable Time from HIGH
Level
OUTPUT Any Y 1.5
6.5
ns
Control
tPLZ Output Disable Time from LOW
Level
2
7
ns
DM74AS258 Switching Characteristics
Over recommended operating free air temperature range.
Symbol
Parameter
Conditions
tPLH Propagation Delay Time,
LOW-to-HIGH Level Output
tPHL Propagation Delay Time,
HIGH-to-LOW Level Output
VCC = 4.5V to 5.5V,
CL = 50pF,
RL = 500
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
tPZL Output Enable Time to LOW
Level
tPHZ Output Disable Time, from HIGH
Level
tPLZ Output Disable Time from LOW
Level
From
Data
Select
OUTPUT
Control
OUTPUT
Control
To
Any Y
Any Y
Any Y
Any Y
Min. Max. Units
1
5
ns
1
4
ns
2
9.5
ns
2
10
ns
2
8
ns
2
10
ns
1.5
6
ns
2
6.5
ns
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
5
www.fairchildsemi.com
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