75174, LTC485
Quad RS485 line driver.

     +----------+            +---------------+
 1A1 |1  +--+ 16| VCC        | A | EN| Y |/Y |
 1Y1 |2       15| 2A2        |---+---+---+---|
/1Y1 |3       14| 2Y2        | 0 | 1 | 0 | 1 |
 1EN |4       13| /2Y2       | 1 | 1 | 1 | 0 |
/1Y2 |5 75174 12| 2EN        | X | 0 | Z | Z |
 1Y2 |6       11| /2Y1       +---------------+
 1A2 |7       10| 2Y1
 GND |8        9| 2A1
     +----------+

[This information is part of the GIICM]

75176, LTC485
RS485 line transceiver.
                             Receiver:           Transmitter:
    +----------+             +---------------+   +---------------+
  Y |1  +--+  8| VCC         |  A-B  |/OE| Y |   | D |DEN| A | B |
/OE |2        7| B           |-------+---+---|   |---+---+---+---|
DEN |3  75176 6| A           |>+200mV| 0 | 1 |   | 0 | 1 | 0 | 1 |
  D |4        5| GND         |<-200mV| 0 | 0 |   | 1 | 1 | 1 | 0 |
    +----------+             |   X   | 1 | Z |   | X | 0 | Z | Z |
                             +---------------+   +---------------+

[This information is part of the GIICM]