EE87C51FB1SF76 Datasheet, PDF (10/18 Pages) Intel Corporation – CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

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
A Address
C Clock
D Input Data
H Logic level HIGH
I Instruction (program memory contents)
L Logic level LOW or ALE
P PSEN
Q Output Data
R RD signal
T Time
V Valid
W WR signal
X No longer a valid logic level
Z Float
For example
T_AVLL ^e Time from Address Valid to ALE Low
T_LLPL ^e Time from ALE Low to PSEN Low
AC CHARACTERISTICS (T_A ^{e b}40 C to ^a125 C V_CC ^e 5V g 20% V_SS ^e 0V Load Capacitance
for Port 0 ALE PROG and PSEN ^e 100 pF Load Capacitance for All Other Outputs ^e 80 pF)
ADVANCED INFORMATION CONTACT INTEL FOR DESIGN-IN INFORMATION
EXTERNAL PROGRAM MEMORY CHARACTERISTICS
Symbol
Parameter
12 MHz
Oscillator
Min Max
Variable Oscillator
87C51FA FB FC 87C51FC-20
Min
Max
1 T_CLCL
T_LHLL
T_AVLL
T_LLAX
T_LLIV
T_LLPL
T_PLPH
T_PLIV
T_PXIX
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
127
43
53
234
53
205
145
0
35
2T_CLCL ^b 40
T_CLCL ^b 40
T_CLCL ^b 30
T_CLCL ^b 30
3T_CLCL ^b 45
0
16 20
4T_CLCL ^b 100
4T_CLCL ^b 75
3T_CLCL ^b 105
3T_CLCL ^b 90
T_PXIZ
Input Inst Float After
59
PSEN Trans
T_AVIV
Address Valid to Valid
312
Instruction In
T_CLCL ^b 25
T_CLCL ^b 20
5T_CLCL ^b 105
T_PLAZ
PSEN Low to Address
10
10
Float
T_RLRH
T_WLWH
RD Pulse Width
WR Pulse Width
400
6T_CLCL ^b 100
400
6T_CLCL ^b 100
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
10