LTC2851 - 3.3V 20Mbps RS485/RS422 Transceiver

The LTC2850, LTC2851 and LTC2852 are low power, 20Mbps RS485/RS422 transceivers operating on 3.3V supplies. The receiver has a one-eighth unit load supporting up to 256 nodes per bus (C, I-grade), and a failsafe feature that guarantees a high output state under conditions of floating or shorted inputs.

The driver 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 thermal shutdown.

Enhanced ESD protection allows these parts to withstand up to ±15kV (human body model) on the transceiver interface pins without latchup or damage.

Features
  • 3.3V Supply Voltage
  • 20Mbps Maximum Data Rate
  • No Damage or Latchup Up to ±15kV HBM
  • High Input Impedance Supports 256 Nodes (C, I‑Grade)
  • Operation Up to 125°C (H-Grade)
  • Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range
  • Current Limited Drivers and Thermal Shutdown
  • Delayed Micropower Shutdown: 5μA Maximum (C, I-Grade)
  • Power Up/Down Glitch-Free Driver Outputs
  • Low Operating Current: 370μA Typical in Receive Mode
  • Compatible with TIA/EIA-485-A Specifications
  • Available in 8-Pin and 10-Pin 3mm × 3mm DFN, 8-Pin and 10-Pin MSOP, and 8-Pin and 14-Pin SO Packages
Typical Application
LTC2851 Typical Application
LTC2851 Typical Application
Applications
  • Low Power RS485/RS422 Transceiver
  • Level Translator
  • Backplane Transceiver
Packaging
LTC2851 Package Drawing
LTC2851 Package Drawing
LTC2851 Package Drawing
LTC2851 Package Drawing
LTC2851 Package Drawing
LTC2851 Package Drawing
LTC2851 Package Drawing
LTC2851 Package Drawing
LTC2851 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2851CDD#PBF3x3 DFN-8C$2.21$1.55
LTC2851CDD#TRPBF3x3 DFN-8C$1.61
LTC2851CMS8#PBFMS-8C$2.21$1.55
LTC2851CMS8#TRPBFMS-8C$1.61
LTC2851CS8#PBFSO-8C$2.21$1.55
LTC2851CS8#TRPBFSO-8C$1.61
LTC2851HDD#PBF3x3 DFN-8H$2.99$2.04
LTC2851HDD#TRPBF3x3 DFN-8H$2.10
LTC2851HMS8#PBFMS-8H$2.99$2.04
LTC2851HMS8#TRPBFMS-8H$2.10
LTC2851HS8#PBFSO-8H$2.99$2.04
LTC2851HS8#TRPBFSO-8H$2.10
LTC2851IDD#PBF3x3 DFN-8I$2.64$1.86
LTC2851IDD#TRPBF3x3 DFN-8I$1.92
LTC2851IMS8#PBFMS-8I$2.64$1.86
LTC2851IMS8#TRPBFMS-8I$1.92
LTC2851IS8#PBFSO-8I$2.64$1.86
LTC2851IS8#TRPBFSO-8I$1.92
LTC2851MPDD3x3 DFN-8MP$6.64$4.65
LTC2851MPDD#PBF3x3 DFN-8MP$6.64$4.65
LTC2851MPDD#TRPBF3x3 DFN-8MP$4.71
LTC2851MPMS8MS-8MP$6.64$4.65
LTC2851MPMS8#PBFMS-8MP$6.64$4.65
LTC2851MPMS8#TRPBFMS-8MP$4.71
LTC2851MPS8SO-8MP$6.64$4.65
LTC2851MPS8#PBFSO-8MP$6.64$4.65
LTC2851MPS8#TRPBFSO-8MP$4.71
Datasheet
Reliability Data
Product Selector Card
Press Release
Software and Simulation
CAD Symbol
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LTC2851 IBIS Model
LTC2851 Footprints and Symbols