80387DX Datasheet, PDF (5/17 Pages) Maxwell Technologies – Math Coprocessor

Math Coprocessor
80387DX
TABLE 8. 80387DX TIMING REQUIREMENTS OF THE BUS INTERFACE UNIT (OUTPUT TRIP LEVEL = 1.5V)
(V_CC = 4.75V TO 5.25V; T_A = -55 TO +125°C, UNLESS OTHERWISE SPECIFIED)
PARAMETER
CONDITIONS
SYMBOL
MIN
MAX
UNIT
386CLK2 Period¹
-16
-20
-25
At 2.0V
t₁
ns
31
125
25
125
20
125
386CLK2 High Time
-16
-20
-25
At 2.0V
t_2a
ns
9
--
8
--
7
--
386CLK2 High Time1
-16
-20
-25
At 3.7V
t_2b
ns
5
--
5
--
4
--
386CLK2 Low Time
-16
-20
-25
386CLK2 Low Time¹
-16
-20
-25
386CLK2 Fall Time¹
-16
-20
-25
At 2V
At 0.8V
At 3.7V to 0.8V
t_3a
ns
9
--
8
--
7
--
t_3b
ns
7
--
6
--
5
--
t₄
ns
--
8
--
8
--
7
386CLK2 Rise Time¹
-16
-20
-25
At 0.8V to 3.7V
t₅
ns
--
8
--
8
--
7
386 CLK2/387CLK2 Ratio
--
10/16
14/10
--
READYO Out Delay
-16
-20
-25
C_L = 50 pF
t₇
ns
4
34
3
31
3
24
PEREQ, ERROR Out Delay
-16
-20
-25
C_L = 50 pF
t₇
ns
5
34
5
34
4
33
BUSY Out Delay
-16
-20
-25
C_L = 50 pF
t₇
ns
5
34
5
29
4
29
05.07.02 REV 1
All data sheets are subject to change without notice 5
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