87C51F Intel Corporation, 87C51F Datasheet - Page 10

• Manufacturer Part Number: 87C51F
• Description: CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
• Manufacturer: Intel Corporation

AUTOMOTIVE 87C51FA FB FC FC-20
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has 5 characters The first char-
acter is always a ‘T’ (stands for time) The other
characters depending on their positions stand for
the name of a signal or the logical status of that
signal The following is a list of all the characters and
what they stand for
AC CHARACTERISTICS
for Port 0 ALE PROG and PSEN
ADVANCED INFORMATION CONTACT INTEL FOR DESIGN-IN INFORMATION
EXTERNAL PROGRAM MEMORY CHARACTERISTICS
10
1 T
T
T
T
T
T
T
T
T
T
T
T
T
T
Symbol
A Address
C Clock
D Input Data
H Logic level HIGH
I Instruction (program memory contents)
LHLL
AVLL
LLAX
LLIV
LLPL
PLPH
PLIV
PXIX
PXIZ
AVIV
PLAZ
RLRH
WLWH
CLCL
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 Inst Hold After
PSEN Trans
Input Inst Float After
PSEN Trans
Address Valid to Valid
Instruction In
PSEN Low to Address
Float
RD Pulse Width
WR Pulse Width
Parameter
(T
e
A
100 pF Load Capacitance for All Other Outputs
e b
40 C to
Min
127
205
400
400
Oscillator
43
53
53
a
0
12 MHz
125 C V
Max
234
145
312
For example
59
10
L Logic level LOW or ALE
P PSEN
Q Output Data
R RD signal
T
T Time
V Valid
W WR signal
X No longer a valid logic level
Z Float
T
AVLL
LLPL
CC
e
6T
6T
2T
3T
87C51FA FB FC
T
T
T
e
e
5V
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Time from ALE Low to PSEN Low
Time from Address Valid to ALE Low
Min
3 5
g
0
Variable Oscillator
b
b
b
b
b
20% V
b
b
40
30
30
100
100
40
45
SS
4T
3T
4T
3T
5T
e
T
T
e
87C51FC-20
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
0V Load Capacitance
80 pF)
16 20
Max
10
b
b
b
b
b
b
b
100
105
25
20
75
90
105
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns