Math Coprocessor
(V
CC
= 4.75V
TO
5.25V; T
A
= -55
TO
+125°C,
UNLESS OTHERWISE SPECIFIED
)
P
ARAMETER
NPS1, NPS2 Hold Time
-16
-20
-25
STEN Setup Time
-16
-20
-25
STEN Hold Time
-16
-20
-25
RESETIN Setup Time
-16
-20
-25
RESETIN Hold Time
-16
-20
-25
1. Guaranteed By Design
C
ONDITIONS
S
YMBOL
t
17
2
2
4
t
16
21
21
15
t
17
2
2
4
t
18
13
12
10
t
19
4
4
3
M
IN
80387DX
M
AX
--
--
--
ns
--
--
--
ns
--
--
--
ns
--
--
--
ns
--
--
--
U
NIT
ns
T
ABLE
8. 80387DX T
IMING
R
EQUIREMENTS OF
T
HE
B
US
I
NTERFACE
U
NIT
(O
UTPUT
T
RIP
L
EVEL
= 1.5V)
Memory
2. Float condition occurs when maximum output current becomes less than I
LO
in magnitude. Float Delay is not tested.
T
ABLE
9. 80387DX T
IMING
R
EQUIREMENT OF
O
THER
P
ARAMETER
P
ARAMETER
RESETIN Duration
RESETIN Inactive to First Opcode Write
BUSY Duration
ERROR Inactive to BUSY Inactive
PEREQ Inactive to ERROR Active
READY Active to Busy Active
READY Minimum Time from Opcode Write to Opcode to Opcode/
Operand Write
READY Minimum Time from Operand Write to Operand Write
S
YMBOL
t
30
t
31
t
32
t
33
t
34
t
35
t
36
t
37
M
IN
40
50
6
6
6
4
6
8
4
M
AX
U
NIT
(387 CLK2)
(387 CLK2)
(386 CLK2)
(386 CLK2)
(386 CLK2)
(386 CLK2)
(386 CLK2)
(386 CLK2)
05.07.02 REV 1
All data sheets are subject to change without notice
7
©2002 Maxwell Technologies
All rights reserved.
MAXWELL [ MAXWELL TECHNOLOGIES ]
