AT89LV51
AC Characteristics
Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other
outputs = 80 pF.
External Program and Data Memory Characteristics
Symbol
Parameter
12 MHz Oscillator
Min
1/t
CLCL
t
LHLL
t
AVLL
t
LLAX
t
LLIV
t
LLPL
t
PLPH
t
PLIV
t
PXIX
t
PXIZ
t
PXAV
t
AVIV
t
PLAZ
t
RLRH
t
WLWH
t
RLDV
t
RHDX
t
RHDZ
t
LLDV
t
AVDV
t
LLWL
t
AVWL
t
QVWX
t
QVWH
t
WHQX
t
RLAZ
t
WHLH
Oscillator Frequency
ALE Pulse Width
Address Valid to ALE Low
Address Hold After ALE Low
ALE Low to Valid Instruction In
ALE Low to PSEN Low
PSEN Pulse Width
PSEN Low to Valid Instruction In
Input Instruction Hold After PSEN
Input Instruction Float After PSEN
PSEN to Address Valid
Address to Valid Instruction In
PSEN Low to Address Float
RD Pulse Width
WR Pulse Width
RD Low to Valid Data In
Data Hold After RD
Data Float After RD
ALE Low to Valid Data In
Address to Valid Data In
ALE Low to RD or WR Low
Address to RD or WR Low
Data Valid to WR Transition
Data Valid to WR High
Data Hold After WR
RD Low to Address Float
RD or WR High to ALE High
43
200
203
23
433
33
0
123
t
CLCL
-40
0
97
517
585
300
3t
CLCL
-50
4t
CLCL
-130
t
CLCL
-60
7t
CLCL
-150
t
CLCL
-50
0
t
CLCL
+40
400
400
252
0
2t
CLCL
-70
8t
CLCL
-150
9t
CLCL
-165
3t
CLCL
+50
75
312
10
6t
CLCL
-100
6t
CLCL
-100
5t
CLCL
-165
0
59
t
CLCL
-8
5t
CLCL
-105
10
43
205
145
0
t
CLCL
-25
127
43
48
233
t
CLCL
-40
3t
CLCL
-45
3t
CLCL
-105
Max
Variable Oscillator
Min
0
2t
CLCL
-40
t
CLCL
-40
t
CLCL
-35
4t
CLCL
-100
Max
12
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Units
4-55