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TXS0108E: Design help

Part Number: TXS0108E
Other Parts Discussed in Thread: SN74LXC8T245

Hi Experts,

Good day. Customer would like to use the TXS0108E to drive the optocoupler.

Original query is about the voltage drop when he tested a 470 ohm (using 3.3Va to 5Vb), the voltage is dropped from 5 to 2V. Able to confirm that this is because of the internal pullup that makes it a voltage divider.

Can you confirm if the device can be used on this application? D/S shows it can support up to 50mA.

Optocoupler can be operated from 7 to 12mA.

For your assistance please.

Thank you.

Regards,
Archie A.