D8742 Просмотр технического описания (PDF) - Intel
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D8742 Datasheet PDF : 12 Pages
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8742
A C CHARACTERISTICS DMA
Symbol
Parameter
tACC
tCAC
tACD
tCRQ
NOTE
1 CL e 150 pF
DACK to WR or RD
RD or WR to DACK
DACK to Data Valid
RD or WR to DRQ Cleared
8642 8742
Min
Max
0
0
130
100
Units
ns
ns
ns
ns(1)
A C CHARACTERISTICS PORT 2 TA e 0 C to a70 C VCC e a5V g10%
Symbol
Parameter
f(tCY)
8742 8642(3)
Min
Max
tCP
Port Control Setup before Falling Edge of PROG 1 15 tCYb28
55
tPC
Port Control Hold after Falling Edge of PROG
1 10 tCY
125
tPR
PROG to Time P2 Input Must Be Valid
8 15 tCYb16
650
tPF
Input Data Hold Time
0
150
tDP
Output Data Setup Time
2 10 tCY
250
tPD
Output Data Hold Time
1 10 tCYb80
45
tPP
PROG Pulse Width
6 10 tCY
750
NOTES
1 CL e 80 pF
2 CL e 20 pF
3 tCY e 1 25 ms
A C TESTING INPUT OUTPUT WAVEFORM
A C TESTING LOAD CIRCUIT
INPUT OUTPUT
Units
ns(1)
ns(2)
ns(1)
ns(2)
ns(1)
ns(2)
ns
290256 – 11
CRYSTAL OSCILLATOR MODE
290256 – 12
DRIVING FROM EXTERNAL SOURCE
290256 – 13
Crystal Series Resistance Should be k750 at 12 MHz
k180X at 3 6 MHz
290256 – 14
Rise and Fall Times Should Not Exceed 20 ns Resis-
tors to VCC are Needed to Ensure VIH e 3 5V if TTL
Circuitry is Used
9
9
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