LTC1690 - Differential Driver and Receiver Pair with Fail-Safe Receiver Output


  • No Damage or Latchup to ±15kV ESD (Human Body
    Model), IEC1000-4-2 Level 4 (±8kV) Contact and Level 3 (±8kV)
  • Guaranteed High Receiver Output State for
    Floating, Shorted or Terminated Inputs with No
    Signal Present
  • Drives Low Cost Residential Telephone Wires
  • ICC = 600µA Max with No Load
  • Single 5V Supply
  • –7V to 12V Common Mode Range Permits ±7V
    Ground Difference Between Devices on the Data Line
  • Power-Up/Down Glitch-Free Driver Outputs Permit
    Live Insertion or Removal of Transceiver
  • Driver Maintains High Impedance with the Power Off
  • Up to 32 Transceivers on the Bus
  • Pin Compatible with the SN75179 and LTC490
  • Available in SO, MSOP and PDIP Packages

Typical Application

LTC1690 Typical Application
LTC1690 Typical Application


The LTC®1690 is a low power receiver/driver pair that is compatible with the requirements of RS485 and RS422. The receiver offers a fail-safe feature that guarantees a high receiver output state when the inputs are left open, shorted together or terminated with no signal present. No external components are required to ensure the high receiver output state. Separate driver output and receiver input pins allow full duplex operation. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state. The LTC1690 is fully specified over the commercial and industrial temperature ranges. The LTC1690 is available in 8-Pin SO, MSOP and PDIP packages.


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
LTC1690CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1690CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1690CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1690CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1690CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1690IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LTC1690IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1690IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LTC1690 Package Drawing
LTC1690 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
LTC1690CMS8#PBF MS-8 C $2.85 $2.00 Yes
LTC1690CMS8#TRPBF MS-8 C $2.06 Yes
LTC1690CN8#PBF N-8 C $2.25 $1.65 Yes
LTC1690CS8#PBF SO-8 C $2.35 $1.75 Yes
LTC1690CS8#TRPBF SO-8 C $1.81 Yes
LTC1690IN8#PBF N-8 I $2.90 $2.15 Yes
LTC1690IS8#PBF SO-8 I $3.10 $2.25 Yes
LTC1690IS8#TRPBF SO-8 I $2.31 Yes
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* 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


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