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SN65HVD230 vs the SN65HVD233

Larissa Swanland
Expert 6915 points
Other Parts Discussed in Thread: SN65HVD233, SN65HVD230

We are currently using SN65HVD230 but looking at switching to SN65HVD233. Application is CAN. Unfortunately we do not have a lot of time to test before we make the switch in the field. Are there any compatibility issues we should be aware of or test against?  Note: Pin 5 is floating in our designs.

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    TI__Mastermind 20590 points

    Larissa,

    Generally the change of these 2 devices as you have described shouldn't see a difference.  The HVD233 is a 2nd generation 3V CAN transceiver and has improved electrical specs so going from the HVD230 to the HVD233 shouldn't have any surprises.  You don't mention if you use Rs pin, but it is specified the same for the 2 devices.   The only portion of interest is as you mention Pin 5.  FLoating on HVD230 has no impact.  Floating on the HVD233 also shouldn't matter as it has an internal pull down to keep the device out of loopback mode. If you have a chance it would be better to tie LBK to GND via a stronger external resistor to prevent any noise from ever overloading the weaker internal pull down from working, but the part was designed to work  with pin 5 floating as you have described it (as noted on page 20, top of the HVD233 DS). 

    -- Scott