AT80C51RA2-3CSCV View Datasheet(PDF) - International Rectifier
Part Name
Description
MFG CO.
'AT80C51RA2-3CSCV' PDF : 85 Pages View PDF
AT/TS8xC51Rx2
Table 11-9. AC Parameters for a Variable Clock: derating formula
Standard
Symbol
Type
Clock
X2 Clock
-M
-V
-L
TRLRH
Min
6T-x
3T-x
20
15
25
TWLWH
Min
6T-x
3T-x
20
15
25
TRLDV
Max
5T-x
2.5 T - x
25
23
30
TRHDX
Min
x
x
0
0
0
TRHDZ
Max
2T-x
T-x
20
15
25
TLLDV
Max
8T-x
4T -x
40
35
45
TAVDV
Max
9T-x
4.5 T - x
60
50
65
TLLWL
Min
3T-x
1.5 T - x
25
20
30
TLLWL
Max
3T+x
1.5 T + x
25
20
30
TAVWL
Min
4T-x
2T-x
25
20
30
TQVWX
Min
T-x
0.5 T - x
15
10
20
TQVWH
Min
7T-x
3.5 T - x
15
10
20
TWHQX
Min
T-x
0.5 T - x
10
8
15
TRLAZ
Max
x
x
0
0
0
TWHLH
Min
T-x
0.5 T - x
15
10
20
TWHLH
Max
T+x
0.5 T + x
15
10
20
11.5.5 External Data Memory Write Cycle
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Figure 11-7. External Data Memory Write Cycle
ALE
TWHLH
PSEN
WR
PORT 0
PORT 2
ADDRESS
OR SFR-P2
TLLWL
TWLWH
TLLAX
A0-A7
TAVWL
TQVWX
TQVWH
DATA OUT
ADDRESS A8-A15 OR SFR P2
TWHQX
11.5.6 External Data Memory Read Cycle
67
4188E–8051–08/06
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