HD3SS215: Questions about the input impedance and pull-down resistor for DxSEL, OE and HPDC pins

Massimiliano De Cristofaro

Expert 6640 points

Part Number: HD3SS215

Hello team,

one of my customers has the below questions about the HD3SS215IZQE:

1) pin A1 – DxSEL Which is the impedance of this input? It is not specified in the datasheet.

2) pin B7 – OE Which is the impedance of this input? It is not specified in the datasheet.

3) pin J1 - HPDC They have put an external 10K Pull-Down resistance in this output. There should be no problem. What do you think?

Could you please advice?

Thanks a lot in advance.

Best regards,
Massimiliano De Cristofaro
Texas Instruments FAE

over 6 years ago

0 Francisco Javier Zamudio over 6 years ago

TI__Expert 5455 points

Hello Massimiliano,

We are working on your case, thanks for your patient.

Regards
Francisco

0 Francisco Javier Zamudio over 6 years ago in reply to Francisco Javier Zamudio

TI__Expert 5455 points

Hello Massimiliano

These are the values measured on EVM

The impedance measured on EVM is:
OE 9.37M
DXSEL 9.36M

The source should already have this signal pulled down and we recommend to use a 100k resistor.

Regards
Francisco

0 Massimiliano De Cristofaro over 6 years ago in reply to Francisco Javier Zamudio

TI__Expert 6640 points

Hello Francisco,

thanks a lot for your support.

I have sent this into to the customer.

Best regards,
Massimiliano.

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HD3SS215: Questions about the input impedance and pull-down resistor for DxSEL, OE and HPDC pins