LMK00334 questions

Jacky Chen29

Genius 4735 points

Other Parts Discussed in Thread: LMK00334

Hola,

I have two questions about LMK00334 as below：

QUESTION-1：

CLKin0、CLKin1、XTAL input are selected by CLKin_SEL.

1) When select CLKLin0 as a input, CLKin0 = 100MHz and the CLKoutA0、CLKoutB0 = 100MHz？right？

2) When select CLKLin1 as a input, CLKin1 = 200MHz and the CLKoutA0、CLKoutB0 = 200MHz？right？

3) When select XTAL as a input, XTAL = 25MHz and the CLKoutA0、CLKoutB0 = 100MHz？right？

4) About CLKoutA0*, what does * mean？......a negative differential signal？

QUESTION-2：

Pin28 & 32 has no description in pin function table, is it correct for these two pin define？

over 10 years ago

0 ShreyasRao over 10 years ago

TI__Guru 64200 points

Hey Jacky ,

will move your post into clocks forum.

0 Alan O over 10 years ago

TI__Mastermind 32575 points

Here are the answers:

1) When select CLKLin0 as a input, CLKin0 = 100MHz and the CLKoutA0、CLKoutB0 = 100MHz？right？
>> You're correct.

2) When select CLKLin1 as a input, CLKin1 = 200MHz and the CLKoutA0、CLKoutB0 = 200MHz？right？
>> You're correct.

3) When select XTAL as a input, XTAL = 25MHz and the CLKoutA0、CLKoutB0 = 100MHz？right？
>> No, all CLKout's will be 25 MHz (same as XTAL frequency).

4) About CLKoutA0*, what does * mean？......a negative differential signal？
>> You're correct. It's the inverted or complementary output of the differential pair.

Pin28 & 32 has no description in pin function table, is it correct for these two pin define？
>> Yes, these are Vcc pins and showed be powered with 3.3V +/-5%.

Alan

0 Jacky Chen29 over 10 years ago in reply to Alan O

Genius 4735 points

Hola Alan,

Clear and helpful. Thank you very so much.

So if the X'TAL input is single end and the output will become to HCSL？right？

0 Jacky Chen29 over 10 years ago in reply to Jacky Chen29

Genius 4735 points

Hola Alan,

So if the X'TAL input is single end and the output will become to HCSL？right？

Clock & timing

Clock & timing forum

LMK00334 questions