144
AT89C51ID2
4289C–8051–11/05
Table 99. AC Parameters for a Fix Clock
Table 100. AC Parameters for a Variable Clock
Symbol
-M
-L
Units
Min
Max
Min
Max
T25
25
ns
T
LHLL
35
ns
T
AVLL
55
ns
T
LLAX
55
ns
T
LLIV
n 65
65
ns
T
LLPL
55
ns
T
PLPH
50
ns
T
PLIV
30
ns
T
PXIX
00
ns
T
PXIZ
10
ns
T
AVIV
80
ns
T
PLAZ
10
ns
Symbol
Type
Standard
Clock
X2 Clock
X parameter for
-M range
X parameter for
-L range
Units
T
LHLL
Min
2 T - x
T - x
15
ns
T
AVLL
Min
T - x
0.5 T - x
20
ns
T
LLAX
Min
T - x
0.5 T - x
20
ns
T
LLIV
Max
4 T - x
2 T - x
35
ns
T
LLPL
Min
T - x
0.5 T - x
15
ns
T
PLPH
Min
3 T - x
1.5 T - x
25
ns
T
PLIV
Max
3 T - x
1.5 T - x
45
ns
T
PXIX
Min
x
0
ns
T
PXIZ
Max
T - x
0.5 T - x
15
ns
T
AVIV
Max
5 T - x
2.5 T - x
45
ns
T
PLAZ
Max
x
10
ns
