MC1489A: MC1489A Capacitive Loading

Jason Haedt

Part Number: MC1489A

I am trying to calculate the complete capacitive load on a 1-wire network. There is a MC1489A chip in our 1-wire path. I cannot seem to find anything in the datasheet about it’s input capacitance or capacitive load. Do you know where I could find this information on this part?

-Jason

over 6 years ago

0 Hao L over 6 years ago

TI__Mastermind 25705 points

Jason,

What's the data rate of your application? Per RS-232 standard, data rates less than 20k baud work with 2500pF cable capacitance. For data rates greater than 20k baud, C load is 1000pF. Please let me know if they're beyond the range of your application.

Regards,

Hao

0 Jason Haedt over 6 years ago in reply to Hao L

TI__Expert 4600 points

Is there a specification the chip itself contains? i.e. Input capacitance/output capacitance

0 Hao L over 6 years ago in reply to Jason Haedt

TI__Mastermind 25705 points

Jason,

There is no spec about input or output cap for this device. If you need, I can take some lab measurement to get the typical values.

Regards,
Hao

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MC1489A: MC1489A Capacitive Loading