DS89C420 Datasheet, PDF (48/59 Pages) Dallas Semiconductor – Ultra-High-Speed Microcontroller

DS89C420
PARAMETER
Port 2 Address to Valid
Data In
ALE Low to RD or WR
Low
Port 0 Address Valid to
RD or WR Low
Port 2 Address Valid to
RD or WR Low
Data Out Valid to WR
Transition
SYMBOL
tAVDV2
tLLRL
(tLLWL)
tAVRL0
(tAVWL0)
tAVRL2
(tAVWL2)
1 CYCLE
PAGE MODE 1
MIN
MAX
tCLCL - 16 +
tSTC1
2 CYCLE
PAGE MODE 1
MIN
MAX
1.5tCLCL - 16
+ tSTC1
4 CYCLE
PAGE MODE 1
MIN
MAX
3.5tCLCL - 16
+ tSTC1
PAGE MODE 2
MIN
MAX
3.0tCLCL - 16
+ tSTC1
NON-PAGE MODE
MIN
MAX
UNITS
3.5tCLCL - 20
ns
+ tSTC1
0.5tCLCL - 8 0.5tCLCL + 1 2tCLCL - 8 + 2tCLCL + 8 + 4tCLCL - 8 + 4tCLCL + 8 + 0.5tCLCL - 8 + 0.5tCLCL + 4 0.5tCLCL - 8 + 0.5tCLCL + 4
ns
+ tSTC2
+ tSTC2
tSTC2
tSTC2
tSTC2
tSTC2
tSTC2
+ tSTC2
tSTC2
+ tSTC2
1.5tCLCL - 5 +
tCLCL - 5 +
ns
tSTC2
tSTC2
0 + tSTC5 - 5
0.5tCLCL - 5
+ tSTC5
1.5tCLCL - 5
+ tSTC5
tCLCL - 5 +
tSTC5
1.5tCLCL - 5 +
tSTC5
ns
NOTES
2
2
2
2
tQVWX
-5
-5
-5
-5
-5
ns
1
Data Hold After WR
tWHQX
20
20
20
20
20
ns
1
RD or WR High to ALE
tRHLH
High
tSTC2 - 2
tSTC2 + 6
tSTC2 - 2
tSTC2 + 6
tSTC2 - 2
tSTC2 + 6
tSTC2 - 2
tSTC2 + 6
tSTC2 - 2
tSTC2 + 6
ns
1
(tWHLH)
*Specifications to -40°C are guaranteed by design and not production tested.
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