The LTC2859 and LTC2861IDE are low power, 20Mbps RS485/422 transceivers operating on 5V supplies. The receiver includes a logic-selectable 120Ω termination, one-eighth unit load supporting up to 256 nodes per bus, and a fail-safe feature that guarantees a high output state under conditions of floating or shorted inputs.
The driver features a logic-selectable low-EMI 250kbps operating mode, and maintains a high output impedance over the entire common mode range when disabled or when the supply is removed. Excessive power dissipation caused by bus contention or a fault is prevented by current limiting all outputs and by a thermal shutdown.
Enhanced ESD protection allows the LTC2859 and LTC2861IDE to withstand ±15kV (human body model) on the transceiver interface pins without latch-up or damage.
Feature
- Integrated, Logic-Selectable 120Ω Termination Resistor
- 20Mbps Max Data Rate
- No Damage or Latch-up to ESD: ±15kV HBM
- High Input Impedance Supports 256 Nodes
- 250kbps Low-EMI Mode
- Guaranteed Fail-safe Receiver Operation Over the Entire Common Mode Range
- Current Limited Drivers and Thermal Shutdown
- Delayed Micropower Shutdown (5μA Max)
- Power Up/Down Glitch-Free Driver Outputs
- Low Operating Current (900μA Max in Receive Mode)
- Meets All TIA/EIA-485-A Specifications
- Available in 10-Pin 3mm × 3mm DFN, 12-Pin 4mm × 3mm DFN and 16-Pin SSOP Packages
Applications
- Low Power RS485/RS422 Transceiver
- Level Translator
- Backplane Transceiver
(Picture: Pinout)
