LTC1535 - Isolated RS485 Transceiver
Features
- UL Rated Isolated RS485: 2500VRMS
UL Recognized ® File #E151738 - Eliminates Ground Loops
- 250kBd Maximum Data Rate
- Self-Powered with 420kHz Converter
- Half- or Full-Duplex
- Fail-Safe Output High for Open or Shorted Receiver Inputs
- Short-Circuit Current Limit
- Slow Slew Rate Control
- 68kΩ Input Impedance Allows Up to 128 Nodes
- Thermal Shutdown
- 8kV ESD Protection On Driver Outputs and Receiver Inputs
- Available in 28-Lead SW Package
Typical Application
Description
The LTC®1535 is an isolated RS485 full-duplex differential line transceiver. Isolated RS485 is ideal for systems where the ground loop is broken to allow for much larger common mode voltage ranges. An internal capacitive isolation barrier provides 2500VRMS of isolation between the line transceiver and the logic level interface. The powered side contains a 420kHz push-pull converter to power the isolated RS485 transceiver. Internal full-duplex communication occurs through the capacitive isolation barrier. The transceiver meets RS485 and RS422 requirements.
The driver and receiver feature three-state outputs, with the driver maintaining high impedance over the entire common mode range. The drivers have short-circuit current limits in both directions and a slow slew rate select to minimize EMI or reflections. The 68kΩ receiver input allows up to 128 node connections. A fail-safe feature defaults to a high output state when the receiver inputs are open or shorted.
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 |
|---|---|---|---|---|---|
| LTC1535CSW#PBF | SW-28 | SW | C | 05-08-1620 (SW28) | Yes |
| LTC1535CSW#TRPBF | SW-28 | SW | C | 05-08-1620 (SW28) | Yes |
| LTC1535ISW#PBF | SW-28 | SW | I | 05-08-1620 (SW28) | Yes |
| LTC1535ISW#TRPBF | SW-28 | SW | I | 05-08-1620 (SW28) | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC1535CSW#PBF | SW-28 | C | $6.35 | $5.35 | Yes | |
| LTC1535CSW#TRPBF | SW-28 | C | $5.45 | Yes | ||
| LTC1535ISW#PBF | SW-28 | I | $7.30 | $6.15 | Yes | |
| LTC1535ISW#TRPBF | SW-28 | I | $6.25 | Yes | ||
| Buy Now • Request Samples | ||||||
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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC241B | LTC1535CSW | Isolated RS485 | $50.00 | |
| Buy Now | |||
Applications
- Isolated RS485 Receiver/Driver
- RS485 with Large Common Mode Voltage
- Breaking RS485 Ground Loops
- Multiple Unterminated Line Taps
People Who Viewed This Product Also Viewed
- LTM2881 - Complete Isolated RS485/RS422 μModule Transceiver + Power
- LTC4364 - Surge Stopper with Ideal Diode
- LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator
- LT4320/LT4320-1 - Ideal Diode Bridge Controller
- LT3796/LT3796-1 - 100V Constant-Current and Constant-Voltage Controller with Dual Current Sense
- LT4363 - High Voltage Surge Stopper with Current Limit
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
- LT1761 - 100mA, Low Noise, LDO Micropower Regulators in TSOT-23
- LT8471 - Dual Multitopology DC/DC Converters with 2A Switches and Synchronization
- LT3748 - 100V Isolated Flyback Controller
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
