LMK00334: 3.3V Single-end clock input

Kei Kuwahara

Expert 5550 points

Part Number: LMK00334

Hello team,

Can this device input 3.3V single-end clock?

On datasheet, the single end input voltage swing is 2Vpp (Max).

But this device is capable of LVCMOS input, so I am confused.

Best Regards,
Kei Kuwahara

5 months ago

0 William Pfennigwerth 5 months ago

TI__Expert 8231 points

Kei,

I will double check with our validation team, this is unclear.

Regards,

Will

0 William Pfennigwerth 5 months ago in reply to William Pfennigwerth

TI__Expert 8231 points

Kei,

The LMK00334 can only accept signals up to 2Vpp as you have shown above. This can be accomplished with a 1.8V LVCMOS signal. For 3.3V/2.5 LVMOS you have to add a 50-ohm load resistor at the receiver to attenuate the signal to meet the spec and to reduce reflections. Section 9.2.1 of the Datasheet shows exactly how to implement this. So a 3.3V LVCMOS signal will work, you just need to add the 50-ohm termination resistor.

Regards,

Will

Clock & timing

Clock & timing forum

LMK00334: 3.3V Single-end clock input