STR485LVQT Transceiver

By STMicroelectronics 438

STR485LVQT Transceiver

STMicroelectronics' STR485LVQT is a low-power differential line transceiver for data transmission standard RS485 applications in half-duplex mode. Data and enable signals are compatible with 1V8 or 3V3 supplies. Bus signal supply is connected to 3.3 V ±10%. Each driver output and receiver input is protected against ±4 kV electrostatic discharge (HBM), ±8 kV contact discharge, and ±16 kV air discharge shocks without latch-up. Two speeds are selectable through SLR pin: fast data rate up to 20 Mbps or slow data rate for extended cable runs at 250 kbps. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit that forces the driver outputs into a high impedance state. The receiver has a fail-safe feature which guarantees a high output state when the inputs are left open, shorted, or idle.

  • Half-duplex RS-485 transceiver
  • 1.65 V to 3.6 V supply for data and enable signals
  • 3 V to 3.6 V supply for bus supply
  • High speed: up to 20 Mbps data rate
  • Low speed selected by SLR pin: 250 kbps
  • Up to 256 transceivers on the bus at 105°C
  • Failsafe receiver (bus open, idle, and shorted)
  • Thermal shutdown protection
  • Low quiescent current in shutdown mode
  • Extended temperature range: -40°C to +105°C
  • Available in industry standard DFN10
  • Bus-pin protection more than:
    • ±4 kV HBM protection
    • ±8 kV IEC61000-4-2 contact discharge
    • ±16 kV IEC61000-4-2 air discharge
    • Compliant IEC61000-4-4 fast transient burst class B
  • Telecom infrastructure
  • High-speed data links
  • Low-voltage microcontroller communication