AUTOMOTIVE MICROCONTROLLER MCS 51
AC CHARACTERISTICS
T
A
e b
40 C to
a
110 C V
CC
e
5V
g
10% V
SS
e
0V
Load Capacitance for Port 0 ALE and PSEN
e
100 pF
Load Capacitance for All Other Outputs
e
80 pF
12 MHz Oscillator
Min
Max
Variable Oscillator
Min
35
127
43
48
233
58
215
125
0
63
75
302
20
400
400
252
0
97
517
585
200
203
23
433
33
20
43
123
T
CLCL
b
40
300
3T
CLCL
b
50
4T
CLCL
b
130
T
CLCL
b
60
7T
CLCL
b
150
T
CLCL
b
50
20
T
CLCL
a
40
0
2T
CLCL
b
70
8T
CLCL
b
150
9T
CLCL
b
165
3T
CLCL
a
50
6T
CLCL
b
100
6T
CLCL
b
100
5T
CLCL
b
165
T
CLCL
b
8
5T
CLCL
b
115
20
0
T
CLCL
b
20
T
CLCL
b
25
3T
CLCL
b
35
3T
CLCL
b
125
2T
CLCL
b
40
T
CLCL
b
40
T
CLCL
b
35
4T
CLCL
b
100
Max
12 0
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
Symbol
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
Parameter
Oscillator Frequency
ALE Pulse Width
Address Valid to ALE Low
Address Hold after ALE Low
ALE Low to Valid Instr In
ALE Low to PSEN Low
PSEN Pulse Width
PSEN Low to Valid Instr In
Input Instr Hold after PSEN
Input Instr Float after PSEN
PSEN to Address Valid
Address to Valid Instr In
PSEN Low to Address Float
RD Pulse Width
WR Pulse Width
RD Low to Valid Data In
Data Hold after RD High
Data Float after RD High
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 High
RD Low to Address Float
RD or WR High to ALE High
7
INTEL [ INTEL CORPORATION ]
