SN65LVCP1414: Thermal Characteristics

Hi Pete,

Thank you for reaching out with your question. I noticed you posted similar questions for devices DS38EP100, DS42BR400, and EQ50F100. I'm going to consolidate my responses here for brevity.

SN65LVCP1414 has a Recommended Mininum/Maximum Operating Junction Temperature of -10C/125C per data sheet Section "Recommended Operating Conditions". Its Operating Range (ambient) is -40C to 85C. I would expect storage temperature to be similar to the devices listed above.

Could you provide any further details about the insertion loss of your system? Is there a specific protocol you are using in your application?

Best,
David

Hi David,

Thank you kindly for your response there. Ah, apologies I mistakenly wrote max. operating junction temp. for this part.

Can you comment on the Maximum Operating Junction Temperature for the other parts also?

We are running CML and LVDS protocols across the equalisers, with x4 channels for CML in and out, and x1 channel LVDS in and CML out.  I say that sparingly, however, as the devices driving the signals are quite generously configurable.

I can't comment specifically on the Insertion Loss requirements just at the moment, but from the x4 'CML' in and out channels I am driving optocouplers with the below input characteristics (Equalisers need to drive the below):

• Differential Input Voltage Swing Min = 200mVpp
• Differential Input Voltage Swing Max = 800mVpp
• Input Differential Impedance Min = 75R
• Input Differential Impedance Nom = 100R
• Input Differential Impedance Max = 125R

The input to the x1 LVDS in CML out channel is driven by a device with the below output characteristics (Equaliser driven from the below):

• Differential output voltage Min = 500mVpp
• Differential output voltage Typ = 700mVpp
• Differential output voltage Min = 900mVpp

I appreciate your support and comments on the suitability of the above parts there, David.

I'm also happy to receive any recommendations for other parts to consider too.  I'm happy to feature multiple instances of the same part as I say, but the bigger hurdle I'm trying to clear is something with ideally an Operating Temperature over 105 degrees celsius and ideally also providing an operating junction temperature attribute.

Many thanks,

Pete

Hi Peter,

Thanks for the additional details.

DS42BR400 would be suitable for your CML application for up to 85C ambient. I’ll need to check if we have any devices which support up to 105C ambient. I am assuming your 105C requirement is ambient temperature, correct?

Let me do a bit more digging and get back to you on devices which would meet this temperature requirement for CML and a device for LVDS to CML at this temp range.

Best,

David

Thank you kindly, David. Yes, 105 degrees C. ambient. The Operational Junction Temp. is an attribute that is very beneficial for me also just to ensure that we are using the part(s) within healthy margins.

For clarity also, David - Do you feel the SN65LVCP1414 would be unsuitable?  If it is, can you also provide Min. and Max. values for the Input and Output Differential Voltage swing, please?

Can I also assume max. operational junction temperature is unavailable/ cannot be provided for the other parts also?

Many thanks,

Pete.

Hi Peter,

Based on the data sheet's information, using the listed junction-to-ambient thermal resistance, a rough estimate of the maximum operating ambient temperature is 125C - (36.9 C/W * 925mW) = ~90.86C, which is under your 105C ambient requirement. However, I've noted as well that the device is only rated for up to 85C. Please refer to the following application note for further details: https://www.ti.com/lit/an/spra953d/spra953d.pdf 

For SN65LVCP1414, input linear dynamic range is 1200mVpp typical. V_OD_CTRL allows you to select the output swing of the device. The output swing can be either 600mV or 1200mV.

I would suggest to take a look at DS25CP102Q-Q1 for the x1 LVDS link, ensuring to couple each side correctly: https://www.ti.com/product/DS25CP102Q-Q1. However, this device only supports up to 85C ambient.

For the CML channels, I am checking with a colleague on this and hope to get back to you shortly.

Best,
David

Roger. Thank you for confirming, David.

To resolve this in which case, can you provide the below details please, if possible:

• Operating Junction Temperature for devices: EQ50F100, DS38EP100, DS42BR400, DS25CP102Q-Q1
• Confirm if you understand SN65LVCP1414 to be suitable based on the input and output differential voltages I' provided
• Confirm Min & Max Input and Output differential voltages for the SN65LVCP1414

Many thanks again for your support with this, David.

Best,

Pete