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HD74HC670 Datasheet, PDF (5/10 Pages) Hitachi Semiconductor – 4-by-4 Register File (with 3-state outputs) | |||
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HD74HC670
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C
Ta = â40 to
+85°C
Item
Symbol
Propagation delay tPLH
time
t PHL
VCC (V)
2.0
4.5
6.0
Min Typ Max Min
â â 160 â
â 21 32 â
â â 27 â
Max Unit
200 ns
40
34
t PLH
2.0
â â 200 â 250 ns
t PHL
4.5
â 24 40 â 50
6.0
â â 34 â 43
t PLH
2.0
â â 150 â 190 ns
t PHL
4.5
â 18 30 â 38
6.0
â â 26 â 33
Output enable
t ZH
time
t ZL
2.0
â â 150 â 190 ns
4.5
â 18 30 â 38
6.0
â â 26 â 33
Output disable
t HZ
time
t LZ
2.0
â â 150 â 190 ns
4.5
â 17 30 â 38
6.0
â â 26 â 33
Pulse width
tw
2.0
80 â â 100 â ns
4.5
16 â â 20 â
6.0
14 â â 17 â
Setup time
t su
2.0
60 â â 75 â ns
4.5
12 4 â 15 â
6.0
10 â â 13 â
t su
2.0
60 â â 75 â ns
4.5
12 â â 15 â
6.0
10 â â 13 â
Hold time
th
2.0
50 â â 63 â ns
4.5
10 6 â 13 â
6.0
9 â â 11 â
2.0
50 â â 63 â ns
4.5
10 â â 13 â
6.0
9 â â 11 â
Test Conditions
Read select to Q
Write enable to Q
Data to Q
Data to Write enable
Write select to Write enable
Write enable to Data
Write enable to Write select
5
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