Interface RS485/RS422 Transceivers

LTC2863 - ±60V Fault Protected 3V to 5.5V RS485/RS422 Transceivers

LTM2881 - Complete Isolated RS485/RS422 μModule Transceiver + Power

LTC490 - Differential Driver and Receiver Pair

Features

  • Low Power: ICC = 300µA Typical
  • Designed for RS485 or RS422 Applications
  • Single 5V Supply
  • -7V to 12V Bus Common-Mode Range Permits ±7V Ground Difference Between Devices on the Bus
  • Thermal Shutdown Protection
  • Power-Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Package
  • Driver Maintains High Impedance with the Power Off
  • Combined Impedance of a Driver Output and Receiver Allows up to 32 Transceivers on the Bus
  • 70mV Typical Input Hysteresis
  • 28ns Typical Driver Propagation Delays with 5ns Skew for 2.5MB Operation
  • Pin Compatible with the SN75179
  • Available in 8-Lead PDIP and SO Packages

Typical Application

LTC490 Typical Application

Description

The LTC®490 is a low power differential bus/line transceiver designed for multipoint data transmission standard RS485 applications with extended common mode range (12V to –7V). It also meets the requirements of RS422.

The CMOS design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or ESD damage.

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 inputs are left open.

Both AC and DC specifications are guaranteed from 0°C to 70°C and 4.75V to 5.25V supply voltage range.

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
LTC490CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC490CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC490CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC490IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LTC490IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC490IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LTC490 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
LTC490CN8#PBF N-8 C $2.92 $2.40 Yes
LTC490CS8#PBF SO-8 C $3.58 $2.95 Yes
LTC490CS8#TRPBF SO-8 C $3.01 Yes
LTC490IN8#PBF N-8 I $3.58 $2.95 Yes
LTC490IS8#PBF SO-8 I $4.25 $3.35 Yes
LTC490IS8#TRPBF SO-8 I $3.41 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

  • Low Power RS485/RS422 Transceiver
  • Level Translator

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