87C54 Просмотр технического описания (PDF) - Intel
Номер в каталоге
Компоненты Описание
производитель
87C54 Datasheet PDF : 20 Pages
| |||
AUTOMOTIVE 87C54 87C54-20
EXTERNAL MEMORY CHARACTERISTICS (Continued)
Symbol
Parameter
12 MHz Oscillator
Variable Oscillator
87C54 87C54-20
Min
Max
Min
Max
TRLRH RD Pulse Width
400
TWLWH WR Pulse Width
400
TRLDV
RD Low to Valid
Data In
TRHDX Data Hold After RD
0
High
6 TCLCL b 100
6 TCLCL b 100
252
5 TCLCL b 165
5 TCLCL 95
0
TRHDZ Data Float After RD
107
High
2 TCLCL b 60
TLLDV
ALE Low to Valid
Data In
TAVDV Address Valid to
Valid Data In
TLLWL ALE Low to RD or
200
WR Low
517
8 TCLCL b 150
8 TCLCL b 90
585
9 TCLCL b 165
9 TCLCL b 90
300
3 TCLCL b 50 3 TCLCL a 50
TAVWL Address Valid to
203
WR Low
TQVWX Data Valid before
33
WR Low
TWHQX Data Hold after WR
33
High
TQVWH Data Valid to WR
433
High
TRLAZ
RD Low to Address
Float
4 TCLCL b 130
4 TCLCL b 90
TCLCL b 50
TCLCL b 35
TCLCL b 50
TCLCL b 40
7 TCLCL b 150
7 TCLCL b 70
0
0
TWHLH RD or WR High to
43
ALE High
123
TCLCL b 40
TCLCL 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
Share Link: 