at89c51ac3-s3sim ATMEL Corporation, at89c51ac3-s3sim Datasheet - Page 127

• Manufacturer Part Number: at89c51ac3-s3sim
• Description: At89c51ac3 Enhanced 8-bit Microcontroller With 64kb Flash Memory
• Manufacturer: ATMEL Corporation

External Data Memory
Characteristics
4383D–8051–02/08
Table 76. Symbol Description
Table 77. AC Parameters for a Variable Clock (F=40MHz)
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
QVWH
WHQX
WLWH
QVWX
WHLH
RLRH
RHDX
RHDZ
AVDV
AVWL
RLDV
LLWL
RLAZ
LLDV
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
RHDX
RHDZ
AVWL
WHLH
RLRH
RLDV
AVDV
RLAZ
LLDV
LLWL
Parameter
RD Pulse Width
WR Pulse Width
RD to Valid Data In
Data Hold After RD
Data Float After RD
ALE to Valid Data In
Address to Valid Data In
ALE to WR or RD
Address to WR or RD
Data Valid to WR Transition
Data set-up to WR High
Data Hold After WR
RD Low to Address Float
RD or WR High to ALE high
Min
130
130
160
50
75
10
15
10
0
Max
100
160
165
100
30
40
0
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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