82C836 Datasheet, PDF (180/205 Pages) List of Unclassifed Manufacturers – Single-Chip 386sx AT

s AC Characteristics 16- and 20MHz
System Characteristics
Miscellaneous Parameters
Miscellaneous timing specifications are shown in Tables 12-21 through 12-23.
Table 12-21. Miscellaneous Parameters----Output Responses
Symbol
t290
t291
t292
t293
t294
t295
t296
t297
Parameters
XRST inactive from PROCCLK rise
CPURST inactive from PROCCLK rise
BUSCLK delay from PROCCLK (all ratios)
-BUSY delay from -NPBUSY
-BUSY inactive from -XIOW fall (output to port F0H)
-8042CS, -RTTCS delay from PROCCLK rise
PROCCLK rise from CXIN fall
PROCCLK fall from CXIN rise
* 26ns maximum for 82C836A.
16MHz
Min. Max.
4
18
4
18
---- 25
---- 25
---- 35
---- 75
---- 26
---- 27*
20MHz
Min. Max.
4
13
4
13
---- 20
---- 25
---- 30
---- 70
---- 26
---- 27*
Table 12-22. Miscellaneous Parameters----Formula Specifications
Symbol
te296
te297
Critical Path
PROCCLK high symmetry
PROCCLK low symmetry
Formula
t296-t297
t297-t296
16MHz
Min. Max.
---- 3
---- 3
20MHz
Min. Max.
---- 2
---- 2
Table 12-23. Miscellaneous Parameters----Input Requirements
Symbol
t310
t311
t312
t313
t314
t315
t316
t317
t318
Parameters
CXIN cycle time
CXIN low time
CXIN high time
-NPBUSY active pulse width
-NPERR fall after -BUSY fall
-NPERR fall before -NPBUSY rise
-NPERR active pulse width
-READY setup before PROCCLK rise during
coprocessor I/O cycles
-READY hold after PROCCLK rise during
coprocessor I/O cycles
16MHz
Min. Max.
31 ----
12 ----
12 ----
30 ----
0
----
30 ----
35 ----
19 ----
4
----
20MHz
Min. Max.
25 ----
10 ----
10 ----
30 ----
0
----
25 ----
30 ----
12 ----
4
----
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