Requirements:
I'm designing an EVM. Can you confirm that TCA9517 meets these requirements? I'm concerned that the Vcca < Vccb requirement was removed from the datasheet, but is still present in the parametric search tool:
Is there another translator better suited to my application (or that you would rather promote)?
What about TCA9517A?
Thanks,
Ren
Hey Ren,
" I'm concerned that the Vcca < Vccb requirement was removed from the datasheet, but is still present in the parametric search tool:"
Our marketing team and I have been doing some datasheet changes/corrections. We have recently removed in the design portion of the datasheet where VccB must be larger than VccA.
For this device, VccA generates a reference voltage for A side while VccB does reference for B side BUT also drives the pull down FETs on A AND B side. It would be more beneficial if VccB were larger than VccA for higher biasing but the device should still be functional if VccA were larger than VccB.
I still advise you follow the recommended Vcc requirements:
From this you could place host on B side and slave on A side.
I do know there could be concern when A side is much larger than B side. In your case the worst case would be when VccB=3.3V while VccA =5.5V. I believe the ViL could be affected but ideally you should be pulling to 0.4V or lower on B side of the device.
"What about TCA9517A?"
Basically the same thing but has less hysteresis/noise margin and a slightly higher ViLc. I would just stick with the non A version.
Thanks,
-Bobby
