參數(shù)資料
型號(hào): intel i387
廠商: Intel Corp.
英文描述: Military I387 Math Coprocessor(軍用I387數(shù)學(xué)協(xié)處理器)
中文描述: 軍事I387數(shù)學(xué)協(xié)處理器(軍用I387數(shù)學(xué)協(xié)處理器)
文件頁數(shù): 31/41頁
文件大?。?/td> 457K
代理商: INTEL I387
MILITARY i387
TM
MATH COPROCESSOR
5.3 AC Characteristics
(Over Specified Operating Conditions)
Output Trip Level: 1.5V
Table 5.3a. Combinations of Bus Interface and Execution Speeds
Speed Combinations
Functional Block
i387-16
i387-20
i387-25
Bus Interface Unit (MHz)
Execution Unit (MHz)
16
16
20
20
25
25
Table 5.3b. Timing Requirements of the Execution Unit
Pin
Symbol
Parameter
16 MHz
1.5V
20 MHz
1.5V
25 MHz
1.5V
Comments
Min
(ns)
Max
(ns)
Min
(ns)
Max
(ns)
Min
(ns)
Max
(ns)
387CLK2
387CLK2
387CLK2
387CLK2
387CLK2
387CLK2
387CLK2
t1
t2a
t2b
t3a
t3b
t4
t5
Period
High Time
High Time
Low Time
Low Time
Fall Time
Rise Time
31
9
5
9
7
125
25
8
5
8
6
125
20
7
4
7
5
125
2.0V
2.0V
3.7V
2.0V
0.8V
3.7V to 0.8V
0.8V to 3.7V
8
8
8
8
7
7
Table 5.3c. Timing Requirements of the Bus Interface Unit
Pin
Symbol
Parameter
16 MHz
1.5V
20 MHz
1.5V
25 MHz
1.5V
Comments
Min
(ns)
Max
(ns)
Min
(ns)
Max
(ns)
Min
(ns)
Max
(ns)
386CLK2
386CLK2
386CLK2
386CLK2
386CLK2
386CLK2
386CLK2
t1
t2a
t2b
t3a
t3b
t4
t5
Period
High Time
High Time
Low Time
Low Time
Fall Time
Rise Time
31
9
5
9
7
125
25
8
5
8
6
125
20
7
4
7
5
125
2.0V
2.0V
3.7V
2.0V
0.8V
3.7V to 0.8V
0.8V to 3.7V
8
8
8
8
7
7
386CLK2/
387CLK2
Ratio
10/16
14/10
10/16
14/10
10/16
14/10
READYO
READYO
PEREQ
BUSY
BUSY
ERROR
*
C
L
e
50 pF for 25 MHz timing.
t7
t7
t7
t7
t7
t7
Out Delay
Out Delay
Out Delay
Out Delay
Out Delay
Out Delay
4
4
5
5
34
31
34
34
N/A
34
3
3
5
5
31
27
34
29
N/A
34
3
3
4
4
4
4
24
21
33
29
27
33
C
L
e
75 pF
*
C
L
e
25 pF
C
L
e
75 pF
*
C
L
e
75 pF
*
C
L
e
25 pF
C
L
e
75 pF
*
N/A
5
N/A
5
NOTE:
1. Float conditions occurs when maximum output current becomes less than I
LO
in magnitude.
31
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