82C836 Datasheet, PDF (182/205 Pages) List of Unclassifed Manufacturers – Single-Chip 386sx AT

s AC Characteristics 25MHz
System Characteristics
Standy Refresh
Standby refresh timing specifications are shown in Table 12-27.
Table 12-27. Standby RefreshOutput Responses
Symbol
t370
t371
t372
t373
t374
Parameters
-CAS fall from 32KHz rise or fall during standby
refresh
RAS0, 3 fall after -CAS fall during standby refresh
-CAS rise after RAS1, 2 fall during standby refresh
-RAS low time during standby refresh
-MWE rise before -RAS fall in 32KHz mode
16MHz
Min. Max.
---- 200
12 ----
47 2000
110 2000
15 ----
20MHz
Min. Max.
---- 200
12 ----
47 2000
110 2000
15 ----
AC Characteristics 25MHz
The following parameters are for 25MHz operation in these system configurations:
• Memory configurations up to 4 banks in MRA mode only
• Nonencoded RAS; no buffers on CAS or MD lines
• 80ns DRAM, one wait state; or 60ns DRAM, zero wait state
• Nonlatching buffer between SA-bus and CPU local address bus
• Cache (PEAKsx) or non-cache.
Unless otherwise specified, the following timing parameters are defined under capacitive
load of 50pF, Vcc 4.75V to 5.25V, and temperature of 0 to 70 ° C. All the units
discussed are in nanoseconds. Also, these AC specifications are subject to change.
Formula Specifications refer to the minimum or maximum result of a specified
calculation involving other chip parameters. For any particular chip, formula
specifications express a ‘‘tracking’’ relationship over temperature and voltage for the
parameters involved in the formula.
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