80C51FA Datasheet, PDF (10/13 Pages) Intel Corporation – EVENT-CONTROL CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

AUTOMOTIVE 80C51FA 83C51FA
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 g10% 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)
EXTERNAL MEMORY CHARACTERISTICS
Symbol
Parameter
12 MHz Oscillator
Min
Max
1 T_CLCL Oscillator Frequency
T_LHLL ALE Pulse Width
127
T_AVLL Address Valid to ALE Low
43
T_LLAX Address Hold After ALE Low
53
T_LLIV
ALE Low to Valid Instruction In
224
T_LLPL ALE Low to PSEN Low
53
T_PLPH PSEN Pulse Width
205
T_PLIV
PSEN Low to Valid Instruction In
135
T_PXIX
Input Instr Hold After PSEN Trans
0
T_PXIZ
Input Instr Float After PSEN Trans
59
T_AVIV
Address to Valid Instruction In
302
T_PLAZ PSEN Low to Address Float
10
T_RLRH RD Pulse Width
400
T_WLWH WR Pulse Width
400
T_RLDV RD Low to Valid Data In
242
T_RHDX Data Hold After RD High
b10
T_RHDZ Data Float After RD High
107
T_LLDV ALE Low to Valid Data In
507
T_AVDV Address Valid to Valid Data In
575
T_LLWL ALE Low to RD or WR Low
200
300
T_AVWL Data Valid to WR Low
203
T_QVWX Address Valid before WR Low
23
T_WHQX Data Hold after WR High
33
T_QVWH Data Valid to WE High
433
T_RLAZ RD Low to Address Float
0
T_WHLH RD or WR High to ALE High
43
123
Variable Oscillator
Min
Max
35
16
2T_CLCLb40
T_CLCLb40
T_CLCLb30
T_CLCLb30
3T_CLCLb45
0
4T_CLCLb110
3T_CLCLb115
T_CLCLb25
5T_CLCLb115
10
6T_CLCLb100
6T_CLCLb100
b10
5T_CLCLb175
3T_CLCLb50
4T_CLCLb130
T_CLCLb50
T_CLCLb50
7T_CLCLb150
2T_CLCLb60
8T_CLCLb160
9T_CLCLb175
3T_CLCL a 50
0
T_CLCLb40
T_CLCL a 40
Units
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
10