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RS-485 with 1.8V supply and micro current

Vladimir Aparin
Expert 2610 points
Other Parts Discussed in Thread: SN65HVD37, SN65HVD01

I need RS-485 with minimum voltage (1.8V) and current consumption.
I found Intersil ISL32063E http://www.intersil.com/en/products/interface/serial-interface/rs-485-rs-422/ISL32603E.html that can work from 1.8 V with max supply current low as 150µA. And supply current is 100µA at 3.3V.
But lowest power that i can found at TI.com is SN65HVD37 - only 800 µA and 3.3V.
What can TI offer to compete with Intersil in this application?

  • 0
    TI__Expert 5400 points

    Vladimir,

    The SN65HVD01 is a half-duplex RS-485 transceiver which has independent power supplies for the I/O pins and the bus pins.  The I/O supply may operate down to 1.8V, for interfacing with low voltage MCUs.  The bus supply requires at least 3.3V, as do all other TI RS-485 transceivers.

    I notice that with a 1.8V supply, the ISL devices you mention do not meet the RS-422 or RS-485 standard for the driver differential output voltage (VOD), and are not specified at all over common-mode voltage for VS = 1.8V.  Thus these parts may only be useful in applications with sufficiently low data rates, so as not to require termination, and for sufficiently short distances such that a small VOD is acceptable and any ground potential differences between nodes are known to be small.