Interface RS485/RS422 Transceivers
Interface Extended Temperature (H & MP) Interface

LTM2881 - Complete Isolated RS485/RS422 μModule Transceiver + Power

LTC2851 - 3.3V 20Mbps RS485/RS422 Transceiver

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

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC2851CDD#PBF 3x3 DFN-8 DD C 05-08-1698 Yes
LTC2851CDD#TRPBF 3x3 DFN-8 DD C 05-08-1698 Yes
LTC2851CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC2851CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC2851CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC2851CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC2851HDD#PBF 3x3 DFN-8 DD H 05-08-1698 Yes
LTC2851HDD#TRPBF 3x3 DFN-8 DD H 05-08-1698 Yes
LTC2851HMS8#PBF MS-8 MS8 H 05-08-1660 Yes
LTC2851HMS8#TRPBF MS-8 MS8 H 05-08-1660 Yes
LTC2851HS8#PBF SO-8 S8 H 05-08-1610 (S8) Yes
LTC2851HS8#TRPBF SO-8 S8 H 05-08-1610 (S8) Yes
LTC2851IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC2851IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC2851IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LTC2851IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes
LTC2851IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC2851IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC2851MPDD 3x3 DFN-8 DD MP 05-08-1698 No
LTC2851MPDD#PBF 3x3 DFN-8 DD MP 05-08-1698 Yes
LTC2851MPDD#TRPBF 3x3 DFN-8 DD MP 05-08-1698 Yes
LTC2851MPMS8 MS-8 MS8 MP 05-08-1660 No
LTC2851MPMS8#PBF MS-8 MS8 MP 05-08-1660 Yes
LTC2851MPMS8#TRPBF MS-8 MS8 MP 05-08-1660 Yes
LTC2851MPS8 SO-8 S8 MP 05-08-1610 (S8) No
LTC2851MPS8#PBF SO-8 S8 MP 05-08-1610 (S8) Yes
LTC2851MPS8#TRPBF SO-8 S8 MP 05-08-1610 (S8) Yes


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 Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC2851CDD#PBF 3x3 DFN-8 C $2.21 $1.55 Yes
LTC2851CDD#TRPBF 3x3 DFN-8 C $1.61 Yes
LTC2851CMS8#PBF MS-8 C $2.21 $1.55 Yes
LTC2851CMS8#TRPBF MS-8 C $1.61 Yes
LTC2851CS8#PBF SO-8 C $2.21 $1.55 Yes
LTC2851CS8#TRPBF SO-8 C $1.61 Yes
LTC2851HDD#PBF 3x3 DFN-8 H $2.99 $2.04 Yes
LTC2851HDD#TRPBF 3x3 DFN-8 H $2.10 Yes
LTC2851HMS8#PBF MS-8 H $2.99 $2.04 Yes
LTC2851HMS8#TRPBF MS-8 H $2.10 Yes
LTC2851HS8#PBF SO-8 H $2.99 $2.04 Yes
LTC2851HS8#TRPBF SO-8 H $2.10 Yes
LTC2851IDD#PBF 3x3 DFN-8 I $2.64 $1.86 Yes
LTC2851IDD#TRPBF 3x3 DFN-8 I $1.92 Yes
LTC2851IMS8#PBF MS-8 I $2.64 $1.86 Yes
LTC2851IMS8#TRPBF MS-8 I $1.92 Yes
LTC2851IS8#PBF SO-8 I $2.64 $1.86 Yes
LTC2851IS8#TRPBF SO-8 I $1.92 Yes
LTC2851MPDD 3x3 DFN-8 MP $6.64 $4.65 No
LTC2851MPDD#PBF 3x3 DFN-8 MP $6.64 $4.65 Yes
LTC2851MPDD#TRPBF 3x3 DFN-8 MP $4.71 Yes
LTC2851MPMS8 MS-8 MP $6.64 $4.65 No
LTC2851MPMS8#PBF MS-8 MP $6.64 $4.65 Yes
LTC2851MPMS8#TRPBF MS-8 MP $4.71 Yes
LTC2851MPS8 SO-8 MP $6.64 $4.65 No
LTC2851MPS8#PBF SO-8 MP $6.64 $4.65 Yes
LTC2851MPS8#TRPBF SO-8 MP $4.71 Yes
Buy Now • Request Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Low Power RS485/RS422 Transceiver
  • Level Translator
  • Backplane Transceiver

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