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A87C54-20 Просмотр технического описания (PDF) - Intel
Номер в каталоге
Компоненты Описание
производитель
A87C54-20
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 16 KBYTES USER PROGRAMMABLE EPROM
Intel
A87C54-20 Datasheet PDF : 20 Pages
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AUTOMOTIVE 87C54 87C54-20
EXTERNAL MEMORY CHARACTERISTICS
(Continued)
Symbol
Parameter
12 MHz Oscillator
Variable Oscillator
87C54 87C54-20
Min
Max
Min
Max
T
RLRH
RD Pulse Width
400
T
WLWH
WR Pulse Width
400
T
RLDV
RD Low to Valid
Data In
T
RHDX
Data Hold After RD
0
High
6 T
CLCL
b
100
6 T
CLCL
b
100
252
5 T
CLCL
b
165
5 T
CLCL
95
0
T
RHDZ
Data Float After RD
107
High
2 T
CLCL
b
60
T
LLDV
ALE Low to Valid
Data In
T
AVDV
Address Valid to
Valid Data In
T
LLWL
ALE Low to RD or
200
WR Low
517
8 T
CLCL
b
150
8 T
CLCL
b
90
585
9 T
CLCL
b
165
9 T
CLCL
b
90
300
3 T
CLCL
b
50 3 T
CLCL
a
50
T
AVWL
Address Valid to
203
WR Low
T
QVWX
Data Valid before
33
WR Low
T
WHQX
Data Hold after WR
33
High
T
QVWH
Data Valid to WR
433
High
T
RLAZ
RD Low to Address
Float
4 T
CLCL
b
130
4 T
CLCL
b
90
T
CLCL
b
50
T
CLCL
b
35
T
CLCL
b
50
T
CLCL
b
40
7 T
CLCL
b
150
7 T
CLCL
b
70
0
0
T
WHLH
RD or WR High to
43
ALE High
123
T
CLCL
b
40
T
CLCL
a
40
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTE
Timings speicified for the 87C54-20 are valid at 20 MHz only For timings below 20 MHz use the 87C54 timings
11
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