80C187 Datasheet, PDF (22/30 Pages) Intel Corporation – 80-BIT MATH COPROCESSOR

80C187
AC Characteristics
T_C ^e 0 C to ^a85 C V_CC ^e 5V g10%
All timings are measured at 1 5V unless otherwise specified
12 5 MHz
Symbol
Parameter
Min
Max
(ns)
(ns)
T_dvwh (t6)
Data Setup to NPWR
43
T_whdx (t7)
Data Hold from NPWR
14
T_rlrh (t8)
NPRD Active Time
59
T_wlwh (t9)
NPWR Active Time
59
T_avwl (t10)
Command Valid to NPWR
0
T_avrl (t11)
Command Valid to NPRD
0
T_mhrl (t12)
Min Delay from PEREQ Active
40
to NPRD Active
T_whax (t18)
Command Hold from NPWR
12
T_rhax (t19)
Command Hold from NPRD
12
T_ivcl (t20)
NPRD NPWR RESET to
46
CLK Setup Time
T_clih (t21)
NPRD NPWR RESET from
26
CLK Hold Time
T_rscl (t24)
RESET to CLK Setup
21
T_clrs (t25)
RESET from CLK Hold
14
T_cmdi (t26)
Command Inactive Time
Write to Write
69
Read to Read
69
Read to Write
69
Write to Read
69
16 MHz
Min
Max
(ns)
(ns)
33
14
54
54
0
0
30
8
8
38
18
19
9
59
59
59
59
Test
Conditions
Note 1
Note 1
Note 1
Note 1
NOTE
1 This is an asynchronous input This specification is given for testing purposes only to assure recognition at a specific CLK
edge
22