
112
AT89C51RB2/RC2
4180E–8051–10/06
Table 76. AC Parameters for a Fix Clock
Table 77. AC Parameters for a Variable Clock
Symbol
-M
-L
Units
Min
Max
Min
Max
T25
25
ns
TLHLL
35
ns
TAVLL
55
ns
TLLAX
55
ns
TLLIV
n 65
65
ns
TLLPL
55
ns
TPLPH
50
ns
TPLIV
30
ns
TPXIX
00
ns
TPXIZ
10
ns
TAVIV
80
ns
TPLAZ
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