at89c51rd2-smsum ATMEL Corporation, at89c51rd2-smsum Datasheet - Page 120

• Manufacturer Part Number: at89c51rd2-smsum
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

120
AT89C51RD2/ED2
Table 25-4.
Table 25-5.
Symbol
Symbol
Symbol Description
AC Parameters for a Fix Clock
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
WLWH
QVWX
QVWH
WHQX
RHDX
RHDZ
AVWL
WHLH
RHDX
AVWL
WHLH
RLRH
RLDV
AVDV
RLAZ
RLRH
RLDV
RHDZ
AVDV
LLDV
LLWL
LLDV
LLWL
RLAZ
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
125
125
155
45
70
10
0
5
0
5
-M
Max
155
160
105
95
25
45
4235J–8051–01/08
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns