PCA9306: PCA9306

Dharani B

Part Number: PCA9306
Other Parts Discussed in Thread: , SN74LVC2G66-Q1

As per the PCA9306 (Industrial grade) datasheet, the device can be used as a switch when VREF1 and VREF2 are equal.

PCA9306 datasheet link: https://www.ti.com/lit/ds/symlink/pca9306.pdf?ts=1625454817466&ref_url=https%253A%252F%252Fwww.google.com%252F

As per our requirement, we are planning to use PCA9306IDCURQ1 (automotive grade) part in our design for level translating 1.8V to 1.8V logic. Will this device essentially turn from a translator to a switch device?

Automotive grade datasheet does not specify the function when VREF1 and VREF2 are equal. Please clarify.

Can we use the PCA9306TDCURQ1 part for level translating from 1.8V to 1.8V logic in the I2C lines?

PCA9306IDCURQ1 datasheet link: https://www.ti.com/lit/ds/symlink/pca9306-q1.pdf?ts=1646812167380&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FPCA9306-Q1

Thanks & Regards,

Dharani

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 317210 points

The PCA9306 and PCA9306-Q1 behave the same; you can use that switch configuration.

It would be simpler to use a plain switch like the SN74LVC2G66-Q1.

0 Danny Bacic over 3 years ago

TI__Mastermind 26806 points

Dharani,

The -Q1 versions of TI's devices are functionally identical to their non-Q1 counterparts. The differences lie in their qualifications and test specifications, which meet automotive requirements. Due to this, on rare occasions, one or two electrical/timing characteristics might vary slightly, but most of the time they will be the same.

Best,

Danny

0 Dharani B over 3 years ago in reply to Clemens Ladisch

Prodigy 110 points

Thanks for your reply.

I understand PCA9306TDCURQ1 part can be used for level translating from 1.8V to 1.8V logic in the I2C lines. Please correct me if am wrong.

Attached image for reference.

Regards,

Dharani

0 Clemens Ladisch over 3 years ago in reply to Dharani B

Guru 317210 points

Please do not call it "translating" when the voltages are the same.

This circuit makes sense only if you want to disconnect the I²C devices while SAFE_1v8 is powered down. Does this describe your application?

0 Dharani B over 3 years ago in reply to Clemens Ladisch

Prodigy 110 points

Thanks for your response.

Yes, The main purpose is for isolating the SOC and I2C devices.

Regards,

Dharani

+1 Clemens Ladisch over 3 years ago in reply to Dharani B

Guru 317210 points

Yes, this will work. (It would also work with the cheaper SN74LVC2G66-Q1.)

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PCA9306: PCA9306