DS125BR800 Datasheet, PDF (9/59 Pages) Texas Instruments – Low-Power 12.5-Gbps 8-Channel Repeater With Input Equalization and Output De-Emphasis

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DS125BR800
SNLS426E – AUGUST 2012 – REVISED JANUARY 2015
7.6 Electrical Characteristics: Serial Management Bus Interface
over recommended operating supply and temperature ranges unless other specified.
PARAMETER
TEST CONDITIONS
SERIAL BUS INTERFACE DC SPECIFICATIONS
V_IL
V_IH
I_PULLUP
Data, Clock Input Low Voltage
Data, Clock Input High Voltage
Current Through Pull-Up Resistor or
Current Source
High Power Specification
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)
(1) (2)
Pullup V_DD = 3.3 V^{(1) (2) (3)}
Pullup V_DD = 2.5 V^{(1) (2) (3)}
(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.
MIN TYP MAX UNIT
0.8 V
2.1
3.6 V
4
mA
2.375
3.6 V
–200
200 µA
–15
µA
10 pF
2000
Ω
1000
Ω
7.7 Timing Requirements
SERIAL BUS INTERFACE TIMING SPECIFICATIONS
FSMB
Bus Operating Frequency⁽¹⁾
TBUF Bus Free Time Between Stop and Start Condition
THD:STA Hold time after (Repeated) Start Condition. After this
period, the first clock is generated.
TSU:STA Repeated Start Condition Setup Time
TSU:STO Stop Condition Setup Time
THD:DAT Data Hold Time
TSU:DAT Data Setup Time
T_LOW
T_HIGH
t_F
t_R
t_POR
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
ENSMB = VDD (Slave Mode)
ENSMB = FLOAT (Master Mode)
At I_PULLUP, Max
(2)
(2)
(2) (3)
MIN TYP MAX UNIT
400 kHz
280 400 520 kHz
1.3
µs
0.6
µs
0.6
0.6
0
100
1.3
(2)_0.6
µs
µs
ns
ns
µs
50
µs
300 ns
300 ns
500 ms
(1) In Master Mode, a serial EEPROM with a minimum rating of 520 KHz is required.
(2) 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.
(3) Specified by Design. Parameter not tested in production.
VOD = [Out+ - Out-]
80%
0V
20%
80%
20%
t_RISE
t_FALL
Figure 1. CML Output and Rise and FALL Transition Time
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