LTC2857 - 20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceiver

The LTC2856-1, LTC2856-2, LTC2857-1, LTC2857-2, LTC2858-1 and LTC2858-2 are low power, RS485/RS422 transceivers operating on 5V supplies at maximum data rates of 20Mbps or 250kbps for low EMI. 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 ±15kV (human body model) on the transceiver interface pins without latchup or damage.

  • 20Mbps or Low EMI 250kbps Maximum Data Rate
  • No Damage or Latchup to ESD: ±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: 900µA Maximum in Receive Mode
  • Compatible with TIA/EIA-485-A Specifications
  • Available in 8-Lead and 10-Lead 3mm × 3mm DFN and 8-Lead and 10-Lead MSOP Packages
Typical Application
LTC2857 Typical Application
LTC2857 Typical Application
  • Low Power RS485/RS422 Transceiver
  • Level Translator
  • Backplane Transceiver
LTC2857 Package Drawing
LTC2857 Package Drawing
LTC2857 Package Drawing
LTC2857 Package Drawing
LTC2857 Package Drawing
LTC2857 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2857CDD-1#PBF3x3 DFN-8C$2.21$1.55
LTC2857CDD-1#TRPBF3x3 DFN-8C$1.61
LTC2857CDD-2#PBF3x3 DFN-8C$2.21$1.55
LTC2857CDD-2#TRPBF3x3 DFN-8C$1.61
LTC2857HDD-1#PBF3x3 DFN-8H$3.00$2.05
LTC2857HDD-1#TRPBF3x3 DFN-8H$2.11
LTC2857HDD-2#PBF3x3 DFN-8H$3.00$2.05
LTC2857HDD-2#TRPBF3x3 DFN-8H$2.11
LTC2857IDD-1#PBF3x3 DFN-8I$2.64$1.86
LTC2857IDD-1#TRPBF3x3 DFN-8I$1.92
LTC2857IDD-2#PBF3x3 DFN-8I$2.64$1.86
LTC2857IDD-2#TRPBF3x3 DFN-8I$1.92
Reliability Data
Product Selector Card
Press Release
Software and Simulation
CAD Symbol
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LTC2857-1 IBIS Model
LTC2857-2 IBIS Model
LTC2857 Footprints and Symbols