DS80PCI402_15 Datasheet, PDF (10/54 Pages) Texas Instruments – 2.5-Gbps / 5.0-Gbps / 8.0-Gbps 4-Lane PCI-Express Repeater With Equalization and De-Emphasis

DS80PCI402
SNLS324E – APRIL 2011 – REVISED JANUARY 2015
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6.6 Electrical Characteristics — Serial Management Bus Interface
Over recommended operating supply and temperature ranges unless other specified.
PARAMETER
TEST CONDITIONS
MIN
SERIAL BUS INTERFACE DC SPECIFICATIONS
V_IL
Data, clock input low voltage
V_IH
Data, clock input high voltage
2.1
I_PULLUP
Current through pullup resistor or
current source
High Power Specification
4
V_DD
I_LEAK-Bus
I_LEAK-Pin
C_I
R_TERM
Nominal bus voltage
Input leakage per bus segment
Input leakage per device pin
Capacitance for SDA and SCL
External termination resistance pull
to V_DD = 2.5 V ± 5% OR 3.3 V ±
10%
(1) (2)
Pullup V_DD = 3.3 V,
(1) (2) (3)
Pullup V_DD = 2.5 V,
(1) (2) (3)
2.375
(1)_-200
TYP
-15
2000
1000
MAX UNIT
0.8
V
3.6
V
mA
3.6
V
+200 µA
µA
10
pF
Ω
Ω
SERIAL BUS INTERFACE TIMING SPECIFICATIONS
FSMB
Bus operating frequency
ENSMB = VDD (Slave Mode)
ENSMB = FLOAT (Master Mode)
T_BUF
Bus free time between stop and
start condition
T_HD:STA
Hold time after (repeated) start
At I_PULLUP, Max
condition. After this period, the first
clock is generated.
T_SU:STA
T_SU:STO
T_HD:DAT
T_SU:DAT
T_LOW
T_HIGH
t_F
t_R
t_POR
Repeated start condition setup time
Stop condition setup time
Data hold time
Data setup time
Clock low period
Clock high period
Clock/data fall time
Clock/data rise time
Time in which a device must be
operational after power-on reset
(4)
(4)
(4)
(4) (5)
400 kHz
280
400
520 kHz
1.3
µs
0.6
µs
0.6
µs
0.6
µs
0
ns
100
ns
1.3
µs
0.6
50
µs
300
ns
300
ns
500 ms
(1) Recommended value.
(2) Recommended maximum capacitance load per bus segment is 400 pF.
(3) Maximum termination voltage should be identical to the device supply voltage.
(4) Compliant to SMBus 2.0 physical layer specification. See System Management Bus (SMBus) Specification Version 2.0, section 3.1.1
SMBus common AC specifications for details.
(5) Specified by Design. Parameter not tested in production.
10
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