LTC2861 Series

20Mbps RS485 Transceivers with Integrated Switchable Termination

Catalog

20Mbps RS485 Transceivers with Integrated Switchable Termination

Part	Receiver Hysteresis	Type	Package / Case	Protocol	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Duplex	Supplier Device Package	Data Rate	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Package / Case
Analog Devices LTC2861CDE#TRPBF	25 mV	Transceiver	12-WFDFN Exposed Pad	RS422 RS485	4.5 V	5.5 V	Surface Mount	Full	12-DFN (4x3)	20 Mbps	70 °C	0 °C
Analog Devices LTC2861IGN#PBF	25 mV	Transceiver	16-SSOP	RS422 RS485	4.5 V	5.5 V	Surface Mount	Full	16-SSOP	20 Mbps	85 °C	-40 °C	0.154 in	3.9 mm
Analog Devices LTC2861CGN#PBF	25 mV	Transceiver	16-SSOP	RS422 RS485	4.5 V	5.5 V	Surface Mount	Full	16-SSOP	20 Mbps	70 °C	0 °C	0.154 in	3.9 mm
Analog Devices LTC2861IDE#TRPBF	25 mV	Transceiver	12-WFDFN Exposed Pad	RS422 RS485	4.5 V	5.5 V	Surface Mount	Full	12-DFN (4x3)	20 Mbps	85 °C	-40 °C

Catalog

20Mbps RS485 Transceivers with Integrated Switchable Termination

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

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