Table 98 – Rainbow Electronics T89C51CC01 User Manual
Page 139
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139
T89C51CC01
Rev. D – 17-Dec-01
19.4.4 External Data Memory
Characteristics
Table 98. Symbol Description
Table 99. AC Parameters for a Variable Clock (F=40MHz)
Symbol
Parameter
T
RLRH
RD Pulse Width
T
WLWH
WR Pulse Width
T
RLDV
RD to Valid Data In
T
RHDX
Data Hold After RD
T
RHDZ
Data Float After RD
T
LLDV
ALE to Valid Data In
T
AVDV
Address to Valid Data In
T
LLWL
ALE to WR or RD
T
AVWL
Address to WR or RD
T
QVWX
Data Valid to WR Transition
T
QVWH
Data set-up to WR High
T
WHQX
Data Hold After WR
T
RLAZ
RD Low to Address Float
T
WHLH
RD or WR High to ALE high
Symbol
Min
Max
Units
T
RLRH
130
ns
T
WLWH
130
ns
T
RLDV
100
ns
T
RHDX
0
ns
T
RHDZ
30
ns
T
LLDV
160
ns
T
AVDV
165
ns
T
LLWL
50
100
ns
T
AVWL
75
ns
T
QVWX
10
ns
T
QVWH
160
ns
T
WHQX
15
ns
T
RLAZ
0
ns
T
WHLH
10
40
ns
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