add RS-485 transceiver

ic/rs485_mx3485.yaml

@@ -0,0 +1,71 @@
+name: MAX3485
+# DIP, SO, DIP, SO
+variations: CPA, CSA, EPA, ESA
+description: transceiver, RS-485/RS-422, 3.3V powered
+datasheet: https://www.analog.com/en/products/max3485.html
+
+pinout:
+  RO: 1
+  ~RE: 2
+  DE: 3
+  DI: 4
+  GND: 5
+  A: 6
+  B: 7
+  VCC: 8
+
+properties:
+  bidir: A,B
+  in: DI,~RE,DE
+  out: RO
+  power: VCC
+  ground: GND
+  inverted: ~RE
+
+schematic:
+  symbol: ic
+  left: RO,~RE,DE,DI
+  right: A,B
+  top: VCC
+  bottom: GND
+
+# DIP https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/pdip/21-0043.pdf
+housing@P: &P
+  pattern: DIP
+  leadCount: 8
+  pitch: 2.54 # e
+  bodyWidth: 6.10-7.87 # E1
+  bodyLength: 8.84-9.91 # D
+  height: 3.18-4.45 # A2
+  leadWidth: 0.2-0.355 # c
+  leadLength: 0.381-0.56 # b
+  leadHeight: 2.921-3.81 # L
+  leadSpan: 7.62-8.26 # E
+
+housing@CPA:
+  suffix: CPA
+  <<: *P
+
+housing@EPA:
+  suffix: EPA
+  <<: *P
+
+# CSA https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/soicn/21-0041.pdf
+housing@S: &S
+  pattern: SOP
+  height: 1.35-1.75 # A
+  leadCount: 8
+  pitch: 1.27 # e
+  bodyWidth: 3.8-4.0 # E
+  bodyLength: 4.8-5.0 # D
+  leadLength: 0.4-1.27 # L
+  leadWidth: 0.35-0.49 # b
+  leadSpan: 5.8-6.2 # H
+
+housing@CSA:
+  suffix: CSA
+  <<: *S
+
+housing@ESA:
+  suffix: ESA
+  <<: *S