TN87C51RA20 データシートの表示（PDF） - Intel
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TN87C51RA20 Datasheet PDF : 20 Pages
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8XC51RA RB RC
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 8XC51RX refers to
8XC51RX and 8XC51RX-1 8XC51RX-24 refers to 8XC51RX-20 and 8XC51RX-24
Symbol
1 TCLCL
TLHLL
TAVLL
TLLAX
TLLIV
TLLPL
TPLPH
TPLIV
TPXIX
Description
Oscillator Frequency
8XC51RX
8XC51RX-1
8XC51RX-20
8XC51RX-24
ALE Pulse Width
Address Valid to
ALE Low
Address Hold After
ALE Low
ALE Low to Valid
Instruction In
8XC51RX
8XC51RX-24
ALE Low to PSEN
Low
PSEN Pulse Width
PSEN Low to Valid
Instruction In
8XC51RX
8XC51RX-24
Input Instruction
Hold After PSEN
12 MHz
Oscillator
Min Max
127
43
53
234
53
205
145
0
20 MHz
Oscillator
Min Max
60
10
20
125
20
105
60
0
24 MHz
Oscillator
Min Max
43
12
12
91
12
80
35
0
Variable
Oscillator
Min
Max
35
12
35
16
35
20
35
24
2 TCLCL b 40
TCLCL b 40
TCLCL b 30
TCLCL b 30
4 TCLCL b 100
4 TCLCL b 75
3 TCLCL b 45
3 TCLCL b 105
3 TCLCL b 90
0
Units
MHz
MHz
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
11
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