TD87C51FC 데이터 시트보기 (PDF) - Intel
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TD87C51FC Datasheet PDF : 20 Pages
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8XC51FX
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
TAVLL e Time from Address Valid to ALE Low
TLLPL e Time from ALE Low to PSEN Low
AC CHARACTERISTICS (Over Operating Conditions Load Capacitance for Port 0 ALE PROG and
PSEN e 100 pF Load Capacitance for All Other Outputs e 80 pF)
EXTERNAL MEMORY CHARACTERISTICS
All parameter values apply to all devices unless otherwise indicated In this table 8XC51FX refers to
8XC51FX 8XC51FX-1 and 8XC51FX-2
Symbol
Parameter
Oscillator
12 MHz 24 MHz 33 MHz
Variable
Units
Min Max Min Max Min Max
Min
Max
1 TCLCL Oscillator Frequency
8XC51FX
8XC51FX-1
8XC51FX-2
8XC51FX-24
8XC51FX-33
35
12
35
16
MHz
05
12
35
24
35
33
TLHLL ALE Pulse Width
127
43
21
2TCLCLb40
ns
TAVLL Address Valid to ALE Low
8XC51FX
43
TCLCLb40
ns
8XC51FX-24
12
TCLCLb30
ns
8XC51FX-33
5
TCLCLb25
ns
TLLAX Address Hold After ALE Low
8XC51FX -24
53
12
TCLCLb30
ns
8XC51FX-33
5
TCLCLb25
ns
TLLIV
ALE Low to Valid Instr In
8XC51FX
8XC51FX-24
8XC51FX-33
234
91
56
4TCLCLb100 ns
4TCLCLb75 ns
4TCLCLb65 ns
TLLPL ALE Low to PSEN Low
8XC51FX -24
53
12
TCLCLb30
ns
8XC51FX-33
5
TCLCLb25
ns
TPLPH PSEN Pulse Width
205
80
46
3TCLCLb45
TPLIV PSEN Low to Valid Instr In
8XC51FX
145
8XC51FX-24
35
8XC51FX-33
35
3TCLCLb105 ns
3TCLCLb90 ns
3TCLCLb55 ns
TPXIX Input Instr Hold after PSEN 0
0
0
0
ns
11
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