80C31BH Datasheet, PDF (10/16 Pages) Intel Corporation – CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

AUTOMOTIVE 80C31BH 80C51BH 87C51
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% (5V g20% EPROM Only)
V_SS ^e 0V Load Capacitance for Port 0 ALE and PSEN ^e 100 pF Load Capacitance for All Other
Outputs ^e 80 pF)
EXTERNAL PROGRAM AND DATA MEMORY CHARACTERISTICS
Symbol
Parameter
1 T_CLCL
T_LHLL
T_AVLL
T_LLAX
T_LLIV
T_LLPL
T_PLPH
T_PLIV
T_PXIX
T_PXIZ
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_WHQX
T_RLAZ
T_WHLH
Oscillator Frequency
87C51 80C51BH 80C31BH
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
Address Valid 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 Valid to Valid Data In
ALE Low to RD or WR Low
Address Valid to RD or WR Low
Data Valid to WR Transition
Data Hold After WR High
RD Low to Address Float
RD or WR High to ALE High
12 MHz Osc
Min Max
Variable Oscillator
Min
Max
35
12 – 16
127
2T_CLCL^b40
28
T_CLCL^b55
48
T_CLCL^b35
224
4T_CLCL^b110
43
T_CLCL^b40
205
3T_CLCL^b45
135
3T_CLCL^b115
0
0
59
T_CLCL^b25
312
5T_CLCL^b105
10
10
400
6T_CLCL^b100
400
6T_CLCL^b100
252
5T_CLCL^b165
0
0
97
2T_CLCL^b70
517
8T_CLCL^b150
585
9T_CLCL^b165
200
300 3T_CLCL^b50 3T_CLCL^a50
203
4T_CLCL^b130
23
T_CLCL^b60
33
T_CLCL^b50
0
0
43
123
T_CLCL^b40
T_CLCL^a40
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
10