EP80579 Datasheet, PDF (1865/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 49-40. SMBus Clock Timings (SMBCLK)
Parameter
Conditions
Min. Typical Max.
Units Notes
Operating Frequency
10
100
KHz
SMB_CLK high time
4.0
50
us
1
SMB_CLK low time
4.7
us
SMB_CLK Rise time
1000
ns
SMB_CLK Fall time
300
ns
Note:
1.
The max high time provides a simple guaranteed method for devices to detect bus
idle conditions
Table 49-41. SMBus Output AC Characteristics
Sym
Parameter
Min Typical Max Unit
t19 Bus frequency
10
100 KHz
t20 Signal rise time
1000
ns
t21 Signal fall time
300
ns
Notes:
1.
A device times out when any clock low exceeds this parameter.
2.
Measured from (V_IL -0.15 V) to (V_IH +0.15 V).
3.
Measured from (V_IH +0.15 V) to (V_IL -0.15 V), 1 kΩ pull-up, 400 pF load.
Fig
49-23
49-23
49-23
Notes
per SMBus
specification
2
3
Figure 49-23.SMBus Transaction
SMBCLK
SMBDATA
t19
t20
t21
t131
t134
t135
t130
t132
t133
t18
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
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