EN87C51FA1SF76 Ver la hoja de datos (PDF) - Atmel Corporation
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EN87C51FA1SF76 Datasheet PDF : 21 Pages
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87C51/80C51BH/80C31BH
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, 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, 87C51/BH refers to
87C51/BH, 87C51-1/BH-1 and 87C51-2/BH-2.
Symbol
1/TCLCL
TLHLL
TAVLL
TLLAX
TLLIV
TLLPL
TPLPH
TPLIV
Parameter
Oscillator Frequency
87C51/BH
87C51-1/BH-1
87C51-2/BH-2
87C51-24/BH-24
ALE Pulse Width
Address Valid to ALE Low
87C51/BH
87C51-24/BH-24
Address Hold After ALE Low
ALE Low to Valid Instr In
87C51/BH
87C51-24/BH-24
ALE Low to PSEN Low
PSEN Pulse Width
PSEN Low to Valid Instr In
87C51/BH
87C51-24/BH-24
12 MHz
Min Max
127
43
53
234
53
205
145
Oscillator
24 MHz
Variable
Min Max
Min
Max
3.5
12
3.5
16
0.5
12
3.5
24
43
2TCLCLb40
TCLCLb40
12
TCLCLb30
12
TCLCLb30
4TCLCLb100
91
4TCLCLb75
12
TCLCLb30
80
3TCLCLb45
3TCLCLb105
35
3TCLCLb90
Units
MHz
MHz
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
12
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