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Original question:

CDCM6208: Unused output and unused power rail

CDCM6208: The output pin connection

Lacey Lin
Intellectual 2900 points
Part Number: CDCM6208

Hi team,

I see the recommendation for the unused output pin as below:

" For HCSL this would be 50 Ohm to GND. For CML, LVDS, LVPECL you can use 100 Ohm differential termination. For LVCMOS you can just leave the pin open or re-use as a test point with a probing pad."

I have several questions related to the unused output pin:

1. For the unused HCSL,  you mean connect both positive and negative pin with 50 ohm to GND.

2. For CML, LVDS,LVPECL, connect the positive and negative pin with 200 Ohm, not need to pull down the pin?

3. For the LVCMOS output, I use the pin mode 8, because it's single end signal, if I just use the positive output(like Y7_P), what should I do to the negative pin(Y7_N)?

Lacey

Thanks so much!

  • 0
    TI__Mastermind 32575 points
    1. Yes, you're correct. Alternatively, unused HCSL output pins can be left floating without 50 ohm load (to reduce output supply current consumption and output switching noise).
    2. No. 10 ohm differential termination means connect 100 ohms across Yx_P and Yx_N pins.
    3. Leave Y7_N floating.

    Alan