82C836 Datasheet, PDF (189/205 Pages) List of Unclassifed Manufacturers – Single-Chip 386sx AT

System Characteristics
AC Characteristics 25MHz s
Table 12-42. Refresh----Input Requirements
Symbol
Parameters
Min.
t280
IOCHRDY setup before OSC2 rise ^†
15
t281
IOCHRDY hold after OSC2 rise ^†
5
t282
-REFRESH setup before OSC2 rise ^†
20
† These parameters are nonrestrictive. The signal may not be recognized until the subsequent clock
these parameters are violated. The parameter specifies only the conditions needed to guarantee re
the signal on a particular clock edge.
ing period if
cognition of
Max.
----
----
----
Miscellaneous Parameters
Miscellaneous timing specifications are shown in Tables 12-43 through 12-45.
Table 12-43. Miscellaneous Parameters----Output Responses
Symbol
t290
t291
t292
t293
t294
t295
t296
t297
Parameters
XRST inactive from PROCCLK rise (C _L = 30pF)
CPURST inactive from PROCCLK rise (C _L = 30pF)
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.
Min.
Max.
4
12
4
12
----
20
----
25
----
30
----
70
----
26
----
27*
Table 12-44. Miscellaneous Parameters----Formula Specifications
Symbol
te296
te297
Critical Path
PROCCLK high symmetry
PROCCLK low symmetry
Formula
t296-t297
t297-t296
Min.
Max.
----
2
----
2
Chips and Technologies, Inc.
PRELIMINARY
Revision 3.0 1 2-21