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SN65HVD74: Design and Replacement questions

d_zero
Genius 4670 points
Part Number: SN65HVD74
Other Parts Discussed in Thread: SN65HVD30

Dear *,

1)

can you tell can we use SN65HVD74 instead of SN65HVD30 ?

2)

as the SN65HVD74 has internal integrated ESD diode, ther is no need to use additional external ESD diodes?

3)

we want to replace ISL3280EIHZ-T with SN65HVD74  and only use the RX channel of the SN65HVD74 is this ok?

also what should we do with unused pins Y,Z,D ?

Best Regards,

David.

  • +1
    TI__Mastermind 30463 points

    Hi David,

    (1)

    The SN65HVD74 is pin-to-pin compatible with the SN65HVD30.  It should work as a replacement. The HVD74 is a newer part, and should be able to handle most electrical standards that the HVD30 upholds. 

    (2)

    If the ESD ratings will be sufficient for your application, then yes, there is no need for additional external ESD circuitry. If you suspect you will see bus voltages that could potential exceed the max bus voltage, then I would recommend the common TVS diode set up on the bus pins to counter against high voltage transients. Internal ESD protection provides +-12kV IEC ESD protection. 

    (3) 

    Using the SN65HVD74 only as a receiver should be fine. Since the device's driver and receiver are fully enabled, the input/output logic will act according to table 3. 

    There is no way to disable the driver with this specific device. So power will constantly be used when not in use. 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    Genius 4670 points

    Hi Tyler,

    1)ok

    2)ok

    3) can you tell how much power will it consume? Also is it better to leave D,Y,Z floating or Y,Z floating and D grounded?

    Best Regards,

    David.

  • 0 in reply to d_zero
    TI__Mastermind 25705 points

    David,

    For power consumption, please refer to the Icc table in the datasheet in the condition that both TX and RX enabled. It's common to ground D while leave Y/Z floating.