EP80579 Datasheet, PDF (1864/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 49-38. SMBus DC Clock Specification (Sheet 2 of 2)
Symbol
Parameter
Conditions
Min
Typical
Max
Units
Notes
Ι_OL
Output sink current
at low voltage
V_OL<0.8
-
-
4
mA
-
Ι_leak
Input Leakage
Current
0<V_IN<Vcc3_3
-
-
±5
µA
-
C_IN
-
-
5
-
pf
1
Notes:
1.
Guaranteed by design. These values are typical values seen for this process, but not measured
during production testing.
49.5.6.3 SMBus AC Characteristics
Table 49-39. SMBus Input AC Characteristics
Sym
Parameter
Min Typical Max Unit Figure
Notes
f_SMB Bus frequency
10
-
100 kHz
per SMBus
specification
T_su,
t135
SMB_DATA setup time
250
-
ns
49-23
T_hd,
t134
SMB_DATA hold time
300
-
ns
49-23
6
T_DTO,
t136
Device Timeout
25
-
35
ms
49-23
1
t130
Bus Tree Time Between Stop and
Start Condition
4.7
-
-
µs
49-23
Hold Time after (repeated) Start
t131 Condition. After this period, the first 4.0
-
clock is generated.
-
µs
49-23
t132
Repeated Start Condition Setup
Time
4.7
-
-
µs
49-23
t133 Stop Condition Setup Time
4.0
-
-
µs
49-23
t137
Cumulative Clock Low Extend Time
(slave device)
-
-
25
ms
49-24
4
t138
Cumulative Clock Low Extend Time
(master device)
-
-
10
ms
49-24
5
Notes:
1.
A device time outs 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.
4.
t137 is the cumulative time a slave device is allowed to extend the clock cycles in one message from
the initial start to stop. If a slave device exceeds this time, it is expected to release both its clock and
data lines and reset itself.
5.
t138 is the cumulative time a master device is allowed to extend its clock cycles within each byte of a
message as defined from start-to-ack, ack-to-ack or ack-to-stop.
6.
t134 has a minimum timing for I²C of 0 ns, while the minimum timing for SMBus is 300 ns.
Intel^® EP80579 Integrated Processor Product Line Datasheet
1864
August 2009
Order Number: 320066-003US