N87L52 查看數據表（PDF） - Intel
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N87L52 Datasheet PDF : 20 Pages
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8XL52 54 58
EXTERNAL MEMORY CHARACTERISTICS (Continued)
All parameter values apply to all devices unless otherwise indicated
Symbol
Parameter
12 MHz
Oscillator
Min Max
20 MHz
Oscillator
Min Max
Variable
Oscillator
Min
Max
TPXIZ
Input Instruction Float
After PSEN
8XL5X
8XL5X-20
59
30
TCLCL b 25
TCLCL b 20
TAVIV
Address to Valid
Instruction In
312
145
5 TCLCL b 105
TPLAZ PSEN Low to Address
10
10
10
Float
TRLRH RD Pulse Width
400
200
6 TCLCL b 100
TWLWH WR Pulse Width
400
200
6 TCLCL b 100
TRLDV
RD Low to Valid Data In
8XL5X
8XL5X-20
252
155
5 TCLCL b 165
5 TCLCL b 95
TRHDX Data Hold After RD
0
0
0
TRHDZ Data Float After RD
107
40
2 TCLCL b 60
TLLDV ALE Low to Valid Data In
8XL5X
517
8XL5X-20
310
8 TCLCL b 150
8 TCLCL b 90
TAVDV
Address to Valid Data In
8XL5X
8XL5X-20
585
360
9 TCLCL b 165
9 TCLCL b 90
TLLWL ALE Low to RD or WR
Low
200 300 100 200 3 TCLCL b 50 3 TCLCL a 50
TAVWL Address Valid to WR
Low
8XL5X
203
4 TCLCL b 130
8XL5X-20
110
4 TCLCL b 90
TQVWX Data Valid before WR
8XL5X
33
8XL5X-20
15
TCLCL b 50
TCLCL b 35
TWHQX Data Hold after WR
8XL5X
33
8XL5X-20
10
TCLCL b 50
TCLCL b 40
TQVWH Data Valid to WR High
8XL5X
433
7 TCLCL b 150
8XL5X-20
280
7 TCLCL b 70
TRLAZ RD Low to Address Float
0
0
0
TWHLH RD or WR High to ALE
High
43 123 10 90
TCLCL b 40
TCLCL a 40
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
12
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