Datasheet
SP
t
BUF
t
HD:STA
t
LOW
t
R
t
HD:DAT
t
HIGH
t
F
t
SU:DAT
t
SU:STA
ST
SP
t
SU:STO
SCK
SDA
SMB_CS
t
SU:CS
ST
t
H:CS
LMH0041, LMH0051
LMH0071, LMH0341
SNLS272Q –APRIL 2007–REVISED APRIL 2013
www.ti.com
SMBus Input Electrical Characteristics
Over supply and Operating Temperature ranges unless otherwise specified.
(1)
Symbol Parameter Condition Min Typ Max Units
V
SIL
Data, Clock Input Low Voltage 0.8 V
V
SIH
Data, Clock Input High Voltage 2.1 V
SDD
V
V
SDD
Nominal Bus Voltage 2.375 3.465 V
V
OL
Output Low voltage I
OL
=2mA 0.3 V
I
SLEAKB
Input Leakage per bus segment See
(2)
−200 200 μA
I
SLEAKP
Input Leakage per pin SCK and SDA pins −10 10 μA
C
SI
Capacitance for SMBdata and SMBclk See
(2) (3)
10 pF
(1) Typical Parameters measured at V
DD
=3.3V, T
A
=25°C. They are for reference purposes and are not production tested.
(2) Recommended value—Parameter is not tested.
(3) Recommended maximum capacitance load per bus segment is 400 pF.
SMBus Switching Characteristics
Over supply and Operating Temperature ranges unless otherwise specified.
(1)
Symbol Parameter Condition Min Typ Max Units
f
SMB
Bus Operating Frequency 10 100 kHz
t
BUF
Bus free time between stop and start 4.7 μs
condition
t
SU:CS
Minimum time between SMB_CS
(2)
30 ns
being active and Start condition
t
H:CS
Minimum time between stop condition
(2)
100 ns
and releasing SMB_CS
t
HD:STA
Hold time after (repeated) start At I
SPULLUP
= MAX 4.0 μs
condition. After this period, the first
clock is generated
t
SU:STA
Repeated Start condition setup time 4.7 μs
t
SU:STO
Stop Condition setup time 4.0 μs
t
HD:DAT
Data hold time 300 ns
t
SU:DAT
Data setup time 250 ns
t
LOW
Clock Low Period 4.7 μs
t
HIGH
Clock high time 4.0 50 μs
t
POR
Time in which a device must be 500 ms
operational after power on
(1) Typical Parameters measured at V
DD
=3.3V, T
A
=25°C. They are for reference purposes and are not production tested.
(2) Specification ensured by characterization
Figure 4. SMBus Timing Parameters
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