Datasheet

120
4235K–8051–05/08
AT89C51RD2/ED2
Table 25-4. Symbol Description
Table 25-5. AC Parameters for a Fix Clock
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
-M
UnitsMin Max
T
RLRH
125 ns
T
WLWH
125 ns
T
RLDV
95 ns
T
RHDX
0 ns
T
RHDZ
25 ns
T
LLDV
155 ns
T
AVDV
160 ns
T
LLWL
45 105 ns
T
AVWL
70 ns
T
QVWX
5 ns
T
QVWH
155 ns
T
WHQX
10 ns
T
RLAZ
0 ns
T
WHLH
5 45 ns