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LMK00101: OE Race Condition at Power Up

Part Number: LMK00101

I'm concerned about a potential race condition at power up if the OE pin is pulled up to directly to a power rail without any external control. If our input clock oscillator and the clock buffer power up at the same time, it seems possible that the clock buffer could detect no clock input and then the device would get stuck in a high or low state and never output any clocks. Is this a potential race condition? Is the only way to solve this to add external control over the OE pin or stagger the start of the power rails of each device? This question is based on this comment in the datasheet.

"If the OE pin is taken from Low to High when there is no input clock present, the outputs will either go High or Low and stay a that state; they will not oscillate."

  • Oliver,

    This statement is only in relevant to the circumstance where there is no input clock present.  As soon as an input clock is present, then "When OE is changed from
    Low to High, the outputs will initially have an impedance of about 400 Ω to ground until the second falling edge of the input clock".  I also double checked in the lab and pulled the OE high with Vdd and later turned on the reference input, and the outputs were enabled.

    Regards,

    Will