87L54 データシートの表示（PDF） - Intel
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87L54 Datasheet PDF : 20 Pages
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8XL52 54 58
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 8XL5X refers to 8XL5X and
8XL5X-1
Symbol
Parameter
12 MHz
Oscillator
Min Max
20 MHz
Oscillator
Min Max
Variable
Oscillator
Min
Max
Units
1 TCLCL
Oscillator Frequency
8XL5X
8XL5X-1
8XL5X-20
35
12
MHz
35
16
MHz
35
20
MHz
TLHLL ALE Pulse Width
127
60
2 TCLCL b 40
ns
TAVLL Address Valid to
43
10
TCLCL b 40
ns
ALE Low
TLLAX Address Hold After 53
20
TCLCL b 30
ns
ALE Low
TLLIV
ALE Low to Valid
Instruction In
8XL5X
8XL5X-20
234
125
4 TCLCL b 100 ns
4 TCLCL b 75 ns
TLLPL
ALE Low to PSEN
53
20
TCLCL b 30
ns
Low
TPLPH PSEN Pulse Width 205
105
3 TCLCL b 45
ns
TPLIV
PSEN Low to Valid
Instruction In
8XL5X
8XL5X-20
145
60
3 TCLCL b 105 ns
3 TCLCL b 90 ns
TPXIX
Input Instruction
0
0
0
ns
Hold After PSEN
11
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