LTC2859 Series
20Mbps RS485 Transceiver with Integrated Switchable Termination
Manufacturer: Analog Devices
Catalog
20Mbps RS485 Transceiver with Integrated Switchable Termination
| Part | Type | Supplier Device Package | Data Rate | Receiver Hysteresis | Protocol | Package / Case | Operating Temperature [Min] | Operating Temperature [Max] | Voltage - Supply [Min] | Voltage - Supply [Max] | Mounting Type | Duplex |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Analog Devices | Transceiver | 10-DFN (3x3) | 20 Mbps | 25 mV | RS422 RS485 | 10-WFDFN Exposed Pad | -40 °C | 105 ░C | 4.5 V | 5.5 V | Surface Mount | Half |
Key Features
• 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
Description
AI
The LTC2859 and LTC2861 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 LTC2861 to withstand ±15kV (human body model) on the transceiver interface pins without latch-up or damage.ApplicationsLow Power RS485/RS422 TransceiverLevel TranslatorBackplane Transceiver