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SN65HVD1780: we want use SN65HVD1780DR instead SN65HVD72

Part Number: SN65HVD1780
Other Parts Discussed in Thread: SN65HVD72

Hi, team  

just copy the inquiry from one of our customer, need your kindly help to answer it.

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we want use SN65HVD1780DR instead SN65HVD72 without Changing the pcb and circuits ,but the tests are not good .
Is the two chips incompatible? Communication between the two chips, the waveform is abnormal, but the communication rate is within the transmission rate range of the two chips.
Also help confirm that SN65HVD1780DR (Datecode20) is there a variety of internal versions of the chip, compatible with each other? And we also tested the communication between SN65HVD1780DR, and it didn't work very well