LMKDB1202: LMKDB1202 Separate Power Supplies and Power Down

D B

Part Number: LMKDB1202

Hello, I see that the LMKDB1202 has separate supply pins for both the clock inputs as well as separate bank supplies for the output buffers. I am wondering, is it possible to operate the component with partial / separate supplies depending on the use case?

For example, if CLKIN0 and CLKIN1 come from different clock sources in different power domains, if SEL is such that CLKIN0 is routed to the outputs can VDD_IN0 be powered by CLKIN0 source and VDD_IN1 be powered down while CLKIN1 is unused and also powered down? Basically if VDD_IN are shared with the oscillator power sources in a partial power down / cold spare situation.

Similarly for the output buffers / banks. If one of the two outputs is permanently unused and OE# tied high, can that output bank be powered down?

Thanks.

5 months ago

0 Michael Srinivasan 5 months ago

TI__Genius 17921 points

Hello,

Sorry for the delay. It is not recommended to operate the component with partial supplies, as you are suggesting. Instead, any unused outputs should simply be disabled.

Thanks,

Michael

0 D B 5 months ago in reply to Michael Srinivasan

Prodigy 10 points

What about he VDD_IN input side? Would CLKIN0->output still function if VDD_IN0 were powered but VDD_IN1 were not powered?

Additionally, can VDD_IN and VDDO_BANKs be different voltages? ie 3.3V VDD_INs and 1.8V VDDO_BANKs.

Thanks.

0 Michael Srinivasan 5 months ago in reply to D B

TI__Genius 17921 points

Hello,

It is not recommended to supply the respective supply pins with different voltages, nor to leave the pins floating.

Thanks,

Michael

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LMKDB1202: LMKDB1202 Separate Power Supplies and Power Down