DS92LV2411: SerDes Design 24-input Channel Transceiver over 70 feet

Paola Gonzalez

Part Number: DS92LV2411
Other Parts Discussed in Thread: DS92LV2422, DS92LV2421, DS25BR100, DS92LV2412,

I need to design a 24 parallel lines SerDes Transceiver whose serial lines can run about 70 feet. Any IC recommendations or design ideas?

over 6 years ago

0 Ikechukwu Anyiam over 6 years ago

TI__Mastermind 35130 points

Hi Paola,

You can reference this application note: www.ti.com/.../snla111a.pdf

Regards,
I.K.

0 Paola Gonzalez over 6 years ago

Prodigy 40 points

Where can I get output information? I want the pulsewidths to be the same and a maximum delay of 500ns from parallel end to parallel end.

0 Ikechukwu Anyiam over 6 years ago in reply to Paola Gonzalez

TI__Mastermind 35130 points

That information should be in the datasheet.

Regards,
I.K.

0 Paola Gonzalez over 6 years ago in reply to Ikechukwu Anyiam

Prodigy 40 points

Thanks for your quick reply. The reason why I asked is because in the datasheet there are a lot of different delays and I am not sure which ones to take into account. I am new to this and a bit confused, that's all.

0 Ikechukwu Anyiam over 6 years ago in reply to Paola Gonzalez

TI__Mastermind 35130 points

Hi Paola,

For the DS92LV2421 and DS92LV2422, I believe the delay specs you need are "tsd" in section 6.11 on page 14 of the datasheet and "tdd" in section 6.12 on page 15 of the datasheet. You will need to take both delays in account since these devices have to be used as a pair.

If you use a buffer to extend the length like in the application note shared above, this will also add additional delay. For example, for the DS25BR100 the propagation delay spec is on page 5 of the datasheet.

Regards,
I.K.

0 Paola Gonzalez over 6 years ago in reply to Ikechukwu Anyiam

Prodigy 40 points

Can I use only 12 bits or do all 24 bits need to be used?? If I can use only 12 bits how does that affect my delay and speed?

0 Ikechukwu Anyiam over 6 years ago in reply to Paola Gonzalez

TI__Mastermind 35130 points

Hi Paola,

Yes it is fine to only use 12 bits. This won't affect the delay/speed. The only way you can affect these is by changing the clock frequency. Due to the proprietary encoding scheme of the DS92LV2411 and DS92LV2412 the speed is fixed at 28*Clock.

Also, I just noticed that in my last reply I quoted the wrong part numbers. They are similar parts though so the parameters you want to look at (tsd and tdd) are the same.

Regards,
I.K.

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DS92LV2411: SerDes Design 24-input Channel Transceiver over 70 feet