RS485 Transceivers at 52Mbps Over Twisted Pair

Posted on Jan 10, 2013

The LTC1685 is geared for half-duplex operation, whereas the LTC1686/LTC1687 can operate in full-duplex mode. All include a receiver fail-safe feature, whereby the receiver output remains in a high state over the entire 12V to 7V common mode range when the inputs are left open or shorted together. A novel protection technique permits indefinite short circuiting of the driver and receiver outputs to supply or ground, while limiting the current to 20mA.

The LTC1685s high speed and tight driver/receiver propagation- delay window make the LTC1685 a natural choice as the external transceiver in high speed (40Mbps) differential SCSI applications. Figure 1 shows a 100-foot passively terminated cat

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