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LMKDB1202: LMKDB1202 LOS# Question

ko byeongguk
Prodigy 140 points
Part Number: LMKDB1202

Tool/software:

Hi, TI

I have a question regarding the LOS# operation of the LMKDB1202.

There are two clock inputs, but only one LOS# signal.

In this case, which clock input does the LOS# operate based on, CLKIN0 or CLKIN1?

When CLKIN_SEL_tri is set to Low (Default), it states that CLKIN0 becomes the source. Does this mean that the source that the LOS# operates on changes depending on the state of CLKIN_SEL_tri?

Additionally, if CLKIN0(CLKIN_SEL_tri is set to Low) is being used as the source, can the LOS# signal be used to check if CLKIN1 is receiving input correctly?

Thank you.

  • 0
    TI__Genius 9010 points

    Hi ko byeongguk,

    Thank you for your question! The LOS# signal will refer to the input clock designated by the CLKIN_SEL_tri pin. If the pin is held low, LOS# will pull low to indicate that there is no valid input signal to CLKIN0. Furthermore, if the pin is held high, LOS# will pull low to indicate that there is no valid input signal to CLKIN1. If CLKIN_SEL_tri is held in the middle state (Hi-Z), the LOS# will act like an AND gate - it will pull low if the input to CLKIN0 *or* CLKIN1 is invalid. Also, please remember to assert the PWRGD/PWRDN# high, as the outputs will be muted otherwise. 

    Thanks,

    Michael