LD83C51FB-2 查看數據表（PDF） - Intel
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LD83C51FB-2 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
3.5
12
3.5
16
MHz
0.5
12
3.5
24
3.5
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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