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Frequent questions

  • [FAQ] DP83867E: What is the default mode of RGMII when using DP83867, shift or align?

    Part Number: DP83867E When bootstrapped to be in RGMII mode, DP83867 will be in shift mode by default; not align mode. The modes will be corroborated via Reg 0x32[1:0].

  • [FAQ] DP83869HM: How to generate 125MHz on CLKOUT pin for DP83869

    Part Number: DP83869HM DP83869HM needs an additional register to be written to enable CLKOUT modification. By default, this signal is a buffered version of the XI signal. Reg 0xC6 must have 0x10 written in order for the value in Reg 0x170[12:8] to take…

  • [FAQ] TI Ethernet PHY Capacitive Coupling (Transformerless Operation)

    Other Parts Discussed in Thread: DP83869 Summary: All of our Industrial Ethernet PHYs support Transformer-less Operation via Capacitive Coupling except for the DP83867. The DP83867 does not support Transformer-less Operation. List of Industrial…

  • [FAQ] DP83867E: Ethernet PHY SGMII Vdiff Upper and Lower Input Limits

    Part Number: DP83867E Other Parts Discussed in Thread: DP83869 The DP83867 and DP83869 both have the same Vdiff Upper and Lower Input Limits of: 100 mV and 800 mV

  • [FAQ] What capacitance should my ESD diode be?

    Other Parts Discussed in Thread: ESD2CANXL24-Q1 , ESD2CAN24-Q1 , ESD2CANFD24-Q1 , ESD122 What should be considered when selecting a diode with parasitic capacitance?

  • [FAQ] DP83825I: How to adjust the Output Differential Voltage (VOD) of the DP83825I

    4540.DP83825I VOD Adjustment.pptx

  • [FAQ] DP83TG720R-Q1: Why is my SGMII eye measurement distorted?

    Part Number: DP83TG720R-Q1 SGMII signal is high frequency low-voltage differential signal. Both layout design and measurements need to be accurate for good eye diagram capture. Common board design guidelines: 100ohms+/-10% differential traces…

  • [FAQ] Can an ESD diode experience latch-up?

    Other Parts Discussed in Thread: STRIKE Is there a risk of latch-up with ESD diodes? Should this be taken into design consideration?

  • [FAQ] What is the difference between TLP and 8/20μs clamping voltages on ESD diode datasheets?

    Other Parts Discussed in Thread: ESD321 , STRIKE What is the TLP clamping voltage, and how is it different compared to the 8/20μs clamping voltage? Take the electrical characteristics for ESD321 as an example:

  • [FAQ] LMH0303: How to Tune LMH0303 LMH0307 Cable Fault detection

    Part Number: LMH0303 Other Parts Discussed in Thread: LMH0307 , Background: The LMH0307/3 termination fault detection was never designed to be precise; its purpose is to provide an indication when no cable is connected to the output (near end). The…

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