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HD74HC257 Datasheet, PDF (5/9 Pages) Hitachi Semiconductor – Quad. 2-to-1-line Data Selectors/Multiplexers(with noninverted 3-state outputs) | |||
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HD74HC257
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C
Ta = â40 to
+85°C
Item
Symbol
Propagation delay tPHL
time
VCC (V)
2.0
4.5
Min Typ Max Min
â â 115 â
â 11 23 â
Max Unit
145 ns
29
6.0
â â 20 â 25
t PLH
2.0
â â 115 â 145 ns
4.5
â 10 23 â 29
6.0
â â 20 â 25
t PHL
2.0
â â 115 â 145 ns
4.5
â 14 23 â 29
6.0
â â 20 â 25
t PLH
2.0
â â 115 â 145 ns
4.5
â 14 23 â 29
6.0
â â 20 â 25
Output enable
t ZL
time
2.0
â â 150 â 190 ns
4.5
â 11 30 â 38
6.0
â â 26 â 33
t ZH
2.0
â â 150 â 190 ns
4.5
â 13 30 â 38
6.0
â â 26 â 33
Output disable
t LZ
time
2.0
â â 150 â 190 ns
4.5
â 14 30 â 38
6.0
â â 26 â 33
t HZ
2.0
â â 150 â 190 ns
4.5
â 18 30 â 38
6.0
â â 26 â 33
Output rise/fall
t TLH
time
t THL
2.0
â â 60 â 75 ns
4.5
â 4 12 â 15
6.0
â â 10 â 13
Input capacitance Cin
â
â 5 10 â 10 pF
Test Conditions
Data to Y
Select to Y
Output control to Y
Output control to Y
5
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