ISO1500 - 3-kVRMS basic isolated RS-485/RS-422 transceiver in ultra-small package

The ISO1500 device is a galvanically-isolated differential line transceiver for TIA/EIARS-485 and RS-422 applications. This device has a 3-channel digital isolator and an RS-485transceiver in an ultra-small 16-pin SSOP package. The bus pins of this transceiver are protectedagainst IEC ESD contact discharge and IEC EFT events. The receiver output has a failsafe for busopen, short, and idle conditions. The small solution size of ISO1500 greatly reduces the boardspace required compared to other integrated isolated RS-485 solutions or discrete implementationwith optocouplers and non-isolated RS-485 transceiver.

The device is used for long distance communications. Isolation breaks the ground loopbetween the communicating nodes, allowing for a much larger common mode voltage range. Thesymmetrical isolation barrier of each device is tested to provide 3000 V_RMSof isolation for 1 minute per UL 1577 between the bus-line transceiver and the logic-levelinterface.

The ISO1500 device can operate from 1.71 V to 5.5 V on side 1 which lets the devicesinterface with low-voltage FPGAs and ASICs. The supply voltage on side 2 is from 4.5 V to 5.5 V.This device supports a wide operating ambient temperature range from –40°C to +125°C.

• Meets or Exceeds Requirements of TIA/EIA-485-A
• Half-Duplex Transceiver
• Low-EMI 1-Mbps Data Rate
• 1.71-V to 5.5-V Logic-Side Supply (V_CC1), 4.5-V to 5.5-V Bus-Side Supply (V_CC2)
• 1/8 Unit Load: Up to 256 Nodes On Bus
• Failsafe Receiver For Bus Open, Short, and Idle
• 100-kV/µs (typical) High Common-Mode Transient Immunity
• Extended Temperature Range from –40°C to +125°C
• Glitch-Free Power-Up and Power-Down for Hot Plug-In
• Ultra-Small SSOP (DBQ-16) Package
• Safety-Related Certifications:
  • All Certifications Planned
  • 4242-V_PK V_IOTM and 566-V_PK V_IORM per DIN V VDE V 0884-11:2017-01
  • 3000-V_RMS Isolation for 1 Minute per UL 1577
  • IEC 60950, IEC 60601 and EN 61010 Certifications
  • CQC, TUV, and CSA Certifications

All trademarks are the property of their respective owners.