
146
AT89C51ID2
4289C–8051–11/05
Table 102. AC Parameters for a Fix Clock
Symbol
-M
-L
Units
Min
Max
Min
Max
T
RLRH
125
ns
T
WLWH
125
ns
T
RLDV
95
ns
T
RHDX
00
ns
T
RHDZ
25
ns
T
LLDV
155
ns
T
AVDV
160
ns
T
LLWL
45
105
45
105
ns
T
AVWL
70
ns
T
QVWX
55
ns
T
QVWH
155
ns
T
WHQX
10
ns
T
RLAZ
00
ns
T
WHLH
5
45
5
45
ns
Table 103. AC Parameters for a Variable Clock
Symbol
Type
Standard
Clock
X2 Clock
X parameter for
-M range
X parameter for
-L range
Units
T
RLRH
Min
6 T - x
3 T - x
25
ns
T
WLWH
Min
6 T - x
3 T - x
25
ns
T
RLDV
Max
5 T - x
2.5 T - x
30
ns
T
RHDX
Min
x
0
ns
T
RHDZ
Max
2 T - x
T - x
25
ns
T
LLDV
Max
8 T - x
4T -x
45
ns
T
AVDV
Max
9 T - x
4.5 T - x
65
ns
T
LLWL
Min
3 T - x
1.5 T - x
30
ns
T
LLWL
Max
3 T + x
1.5 T + x
30
ns
T
AVWL
Min
4 T - x
2 T - x
30
ns
T
QVWX
Min
T - x
0.5 T - x
20
ns
T
QVWH
Min
7 T - x
3.5 T - x
20
ns
T
WHQX
Min
T - x
0.5 T - x
15
ns
T
RLAZ
Max
x
0
ns
T
WHLH
Min
T - x
0.5 T - x
20
ns
T
WHLH
Max
T + x
0.5 T + x
20
ns