LMK00304: Timing of CLKoutA_Type 0/1

Cameron Perl

Expert 4250 points

Part Number: LMK00304

Hey team,

What is the time it takes for the device to switch between buffer types? Is it one clock cycle?

Thanks,

Cam

over 1 year ago

0 Asim Khan over 1 year ago

TI__Genius 9250 points

HI Cam,

I am not sure about the exact timing but let me check if there is any data on it. Otherwise we can do a quick test to get this parameter. I would be able to run test by early next week.

Best,

Asim

0 Cameron Perl over 1 year ago in reply to Asim Khan

TI__Expert 4250 points

Thanks Asim for the quick reply!

+1 Asim Khan over 1 year ago in reply to Cameron Perl

TI__Genius 9250 points

Hi Cam,

I was not able to find this specific information so I did a quick test and below are delay numbers that I see from this device.

Switch CLK Type DC couple: ~31.2 ns

Note common mode voltage might be not fully accurate because its not possible to have proper terminations when switching the output types.

Switch CLK Type AC couple: ~ 35.2 ns

Switch CLK Type AC couple Steady state: 30.12us

This delay is due to AC coupling caps which require additional time for outputs to go to right state. You can have different delays with different cap values.

CLKINSEL 0 to CLKIN 1 Switch Delay: ~ 17.4 ns

Best,

Asim

0 Cameron Perl over 1 year ago in reply to Asim Khan

TI__Expert 4250 points

Hi Asim,

Could you test one additional transition please?

HCSL to Hi-Z and back.

Are the switching times for this transition assumed to be very similar to the previous tests? If you are in Hi-Z state, the clock signal output is 100% off, right?

Thanks,

Cam

+1 Asim Khan over 1 year ago in reply to Cameron Perl

TI__Genius 9250 points

Hi Cam,

Switching time is similar and output clock gets off.

Best,

Asim

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LMK00304: Timing of CLKoutA_Type 0/1