1. Products
  2. Interface and Isolation
  3. RS-232 / RS-422 / RS-485 / RS-562
  4. RS-485 and RS-422
  5. LTC1688


Features and Benefits

  • Ultrahigh Speed:100Mbps
  • Guaranteed Propagation Delay: 8ns ±4ns Over Temperature
  • Low Channel-to-Channel Skew: 500ps Typ
  • Hot Swap Capable
  • 50Mbps Operation with VDD = 3V
  • Low tPLH/tPHL Skew: 500ps Typ
  • Driver Outputs Maintain High Impedance in Three-State or with Power Off
  • Short-Circuit Protected: 3mA Typ Output Current for an Indefinite Short
  • Thermal Shutdown Protected
  • Single 5V or 3V Supply
  • Pin Compatible with LTC486/LTC487

Product Details

The LTC1688/LTC1689 are ultrahigh speed, differential bus/line drivers that can operate at data rates up to 100Mbps. Propagation delay is guaranteed at 8ns ±4ns over the full operating temperature range. These devices operate over the full RS485 common mode range (–7V to 12V), and also meet RS422 requirements.

The driver outputs are Hot Swap capable, maintaining backplane data integrity during board insertion and removal. The drivers feature three-state outputs, maintaining high impedance over the entire common mode range (–7V to 12V). Outputs also remain high impedance during power-up and with the power off. A short-circuit feature detects bus contention and substantially reduces driver output current. Thermal shutdown circuitry protects the parts from excessive power dissipation.

The LTC1688 allows all four drivers to be enabled together, while the LTC1689 allows two drivers at a time to be enabled.

The LTC1688/LTC1689 operate from a single 5V or 3V supply and draw only 9mA of supply current.


  • High Speed RS485 Twisted-Pair Drivers
  • High Speed Backplane Drivers
  • Complementary Clock Drivers
  • STS-1/OC-1 Data Drivers
  • SCSI Drivers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC1688CS#PBF Material Declaration Reliability Data 16-Lead SOIC (Narrow 0.15 Inch)
LTC1688CS#TRPBF Material Declaration Reliability Data 16-Lead SOIC (Narrow 0.15 Inch)
LTC1688IS#PBF Material Declaration Reliability Data 16-Lead SOIC (Narrow 0.15 Inch)
LTC1688IS#TRPBF Material Declaration Reliability Data 16-Lead SOIC (Narrow 0.15 Inch)
Wafer Fabrication Data R410 Reliability Data

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Sample & Buy

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Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



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