LTC1487 - Ultra-Low Power RS485 with Low EMI, Shutdown and High Input Impedance

Features

  • High Input Impedance: Up to 256 Transceivers on the Bus
  • Low Power: ICC = 120µA Max with Driver Disabled
  • ICC = 200µA Max with Driver Enabled, No Load
  • 1µA Quiescent Current in Shutdown Mode
  • Controlled Slew Rate Driver for Reduced EMI
  • Single 5V Supply
  • ESD Protection to ±10kV On Receiver Inputs and Driver outputs
  • -7V to 12V Common-Mode Range Permits ±7V Ground Difference Between Devices on the Data Line
  • Thermal Shutdown Protection
  • Power Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Transceiver
  • Driver Maintains High Impedance in Three-State or with the Power Off
  • Pin Compatible with the LTC485

Typical Application

LTC1487 Typical Application
LTC1487 Typical Application

Description

The LTC®1487 is an ultra-low power differential line transceiver designed with high impedance inputs allowing up to 256 transceivers to share a single bus. It meets the requirements of RS485 and RS422. The LTC1487 features output drivers with controlled slew rate, decreasing the EMI radiated from the RS485 lines, and improving signal fidelity with misterminated lines. The CMOS design offers significant power savings without sacrificing ruggedness against overload or ESD damage. Typical quiescent current is only 80µA while operating and 1µA in shutdown. The driver and receiver feature three-state outputs, with the driver outputs maintaining high impedance over the entire common-mode range. 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 receiver has a fail-safe feature which guarantees a high output state when the iputs are left open. I/O pins are protected against multiple ESD strikes of over ±10kV using the Human Body Model. The LTC1487 is fully specified over the commercial temperature range and is available in 8-pin DIP and SO packages.

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
LTC1487CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1487CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1487CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LTC1487 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
LTC1487CN8#PBF N-8 C $1.85 $1.45 Yes
LTC1487CS8#PBF SO-8 C $2.25 $1.80 Yes
LTC1487CS8#TRPBF SO-8 C $1.86 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

Applications

  • Battery-Powered RS485/RS422 Applications
  • Low Power RS485/RS422 Transceiver
  • Level Translator

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