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CDCLVD2102 EN pin questions

Mo.
Mastermind 22165 points
Other Parts Discussed in Thread: CDCLVD2102

Dear Team,

We received the below customer questions regarding the CDCLVD2102 device.

Please advise.

Kind Regards,

Mo.

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Dear Sir, I am facing a problem about some Clock Buffer device. The Part number: CDCLVD2102 The problem is about the EN pin.

On a state of Low input to it, we will receive STATIC "0".

1) Can you describe the Static Zero Output?

 1.1) Will there be any leakage current on this state?

1.2) Is it a real ground state?

1.3) Describe as much the Voltage and Current of the outputs on the static 0 state. If you are familiar with any other clock buffer 1:1 (or more outputs) that has the ability to shut down the outputs (without any leakage current), please let me know.

  • 0
    TI__Expert 4415 points

    Hi Mo,

    Static zero is an input and is just terminology used to differentiate a floating EN pin with an EN pin that has been grounded. The EN pin internally has both a 200k ohm pullup resistor to Vcc and a 200k ohm pulldown to ground making it a tri-state input. It can either be pulled to Vcc, left floating (so the pin is pulled to 1/2 of Vcc by the pullup and pulldown resistors which form a voltage divider), or grounded (a.k.a., Static zero). See the block diagram on the datasheet, page 2.

    Static zero is true ground. However, since there is an internal resistor voltage divider, there will be some very small amount of current consumption. On page 4 of the datasheet, the Electrical Characteristics chart lists the current consumption of the EN pin as a maximum of 30 microamps:

    30 uA is a very low current consumption at that pin. Is there any reason the customer is concerned with it? The CDCLVD2102 overall is already fairly conservative in its power consumption.

    Regards,

    -Tim