TUSB9261 pullup resistor values on GRSTz

Christophe Lorenz

Intellectual 270 points

Datasheet doesn't specify value / tolerance of the pull up resistor on that pin.

I can measure it, but tolerance is probably large and my measure not representative of the average.

Can you enlighten me ?

I need it to check how much it can affect the passive reset delay.

Thanks.

over 9 years ago

0 Diego Cortes over 9 years ago

TI__Mastermind 36085 points

Hello Christophe,

Please use the section 6.5 from the datasheet as reference (DC Electrical Characteristics for 3.3-V Digital I/O - Receiver section).

VILmax=0.8V
VIHmin=2V

Regards,
Diego.

0 Christophe Lorenz over 9 years ago in reply to Diego Cortes

Intellectual 270 points

That won't help me much figuring out the rise time.

I guess I'll have to measure it.

Chris.

0 Diego Cortes over 9 years ago in reply to Christophe Lorenz

TI__Mastermind 36085 points

Hello Christophe,

The rising time Highly depends on the attached capacitance to the GRSTz pin. This terminal belongs to the Digital I/O group (Receiver), and the input Transition time (TR and TF) should be 10ns maximum, please refer to the datasheet section 6.5, DC Electrical Characteristics for 3.3-V Digital I/O.

Regards,
diego.

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TUSB9261 pullup resistor values on GRSTz