Transceiver Chip Handles RS-232, RS-485 and RS-422




SP335

RS-232/RS-485/RS-422 Transceiver with Internal Termination

Transceiver Chip Handles RS-232, RS-485 and RS-422

Features

  • Pin-Selectable Cable Termination
  • No External Resistors Required for RS-485/422 Termination or Biasing
  • Robust ESD Protection:
    • ±15kV IEC 61000-4-2 Air Gap Discharge
    • ± 8kV IEC 61000-4-2 Contact Discharge
    • ±15kV Human Body Model (HBM)
  • 20Mbps RS-485 and 1Mbps RS-232 Data Rates
  • Pin-Selectable 250kbps Slew Limiting
  • Single Supply Operation from +3V to +5.5V
  • 1.65V to 5.5V Logic Interface VL pin
  • 2 Drivers, 2 Receivers RS-232/V.28
  • 1 Driver, 1 Receiver RS-485/422
    • Full or Half Duplex Configuration
    • 1/8th Unit Load, up to 256 receivers on bus
  • RS-485/422 Enhanced Receiver Fail-safe for open, shorted, or terminated but idle inputs
  • 10nA Shutdown Supply Current (typical)
  • Small 32 QFN package (5mm x 5mm)
Applications

  • Software Programmable Serial Ports (RS-232, RS-422, RS-485)
  • Industrial and Single Board Computers
  • Industrial and Process Control Equipment
  • Point-Of-Sale Equipment
  • HVAC Controls and Networking Equipment
  • Building Security and Automation

Description

The SP335 is an advanced multiprotocol transceiver supporting RS-232, RS-485, and RS-422 serial standards. Integrated cable termination and multiple configuration modes allow all three protocols to be used interchangeably over a single cable or connector with no additional switching components. Full operation requires only four external charge pump capacitors.

The RS-485/RS-232 mode pin selects RS-485 mode when high, and RS-232 mode when low. In RS-485 mode, the TERM pin enables the differential 120Ω termination, and the HALF/FULL pin configures the transceiver as either half or full duplex.

The high speed drivers operate up to 20Mbps in RS-485/422 modes, and up to 1Mbps in RS-232 mode. All drivers can be slew limited to 250kbps in any mode to minimize electromagnetic interference (EMI) by setting the dedicated SLEW pin low.

 

For more detail: Transceiver Chip Handles RS-232, RS-485 and RS-422




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