CDCLVD1208: input unused pin termination

yuichiro ikemoto

Part Number: CDCLVD1208

Tool/software:

For unused clock input pins, a pull-down with 1KΩ is recommended, but is it not acceptable to connect them directly to GND?

0 vicente flores prado 1 month ago

Hi Ikemoto-san,
You can leave floating due to built-in hysteresis or tied to GND via 1k PD. Both are acceptable.

Best regards,

Vicente

0 yuichiro ikemoto 1 month ago in reply to vicente flores prado

Thank you for your reply.

Is it acceptable to use 0Ω instead of 1kΩ for the pull-down?

Short the input to GND.

Best regards.

0 Michael Srinivasan 1 month ago in reply to yuichiro ikemoto

Hi Ikemoto-san,

Are you connecting an entire bank to GND (both the p and n inputs)? Or are you simply one n or one p to GND?

Thanks,

Michael

0 yuichiro ikemoto 1 month ago in reply to Michael Srinivasan

Thank you for your reply.

Both the P and N inputs short to GND.

Best regards.

0 Michael Srinivasan 1 month ago in reply to yuichiro ikemoto

Ikemoto-san,

In that case, it might not be a bad idea to use a capacitor (i.e 0.1 microFarad) to connect the inputs to GND, but you can use a 0 Ω resistor.

Thanks,

Michael

0 yuichiro ikemoto 1 month ago in reply to Michael Srinivasan

Michael san

Thank you

Is it no problem with this usage?

Best regards.

+1 Michael Srinivasan 1 month ago in reply to yuichiro ikemoto

Ikemoto-san,

This usage is fine.

Thanks,

Michael

Clock & timing forum