LTC2859 - 20Mbps RS485 Transceiver with Integrated Switchable Termination
Features
- Integrated, Logic-Selectable 120Ω Termination Resistor
- 20Mbps Max Data Rate
- No Damage or Latchup to ESD: ±15kV HBM
- High Input Impedance Supports 256 Nodes
- 250kbps Low-EMI Mode
- Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range
- Current Limited Drivers and Thermal Shutdown
- Delayed Micropower Shutdown (5μA Max)
- Power Up/Down Glitch-Free Driver Outputs
- Low Operating Current (900μA Max in Receive Mode)
- Meets All TIA/EIA-485-A Specifi cations
- Available in 10-Pin 3mm × 3mm DFN, 12-Pin 4mm × 3mm DFN and 16-Pin SSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC2859 and LTC2861 are low power, 20Mbps RS485/422 transceivers operating on 5V supplies. The receiver includes a logic-selectable 120Ω termination, one-eighth unit load supporting up to 256 nodes per bus, and a failsafe feature that guarantees a high output state under conditions of floating or shorted inputs.
The driver features a logic-selectable low-EMI 250kbps operating mode, and maintains a high output impedance over the entire common mode range when disabled or when the supply is removed. Excessive power dissipation caused by bus contention or a fault is prevented by current limiting all outputs and by a thermal shutdown.
Enhanced ESD protection allows the LTC2859 and LTC2861 to withstand ±15kV (human body model) on the transceiver interface pins without latchup or damage.
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 |
|---|---|---|---|---|---|
| LTC2859CDD#PBF | 3x3 DFN-10 | DD | C | 05-08-1699 | Yes |
| LTC2859CDD#TRPBF | 3x3 DFN-10 | DD | C | 05-08-1699 | Yes |
| LTC2859HDD#PBF | 3x3 DFN-10 | DD | H | 05-08-1699 | Yes |
| LTC2859HDD#TRPBF | 3x3 DFN-10 | DD | H | 05-08-1699 | Yes |
| LTC2859IDD#PBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LTC2859IDD#TRPBF | 3x3 DFN-10 | DD | I | 05-08-1699 | 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 | |
|---|---|---|---|---|---|---|
| LTC2859CDD#PBF | 3x3 DFN-10 | C | $2.27 | $1.55 | Yes | |
| LTC2859CDD#TRPBF | 3x3 DFN-10 | C | $1.61 | Yes | ||
| LTC2859HDD#PBF | 3x3 DFN-10 | H | $2.93 | $2.05 | Yes | |
| LTC2859HDD#TRPBF | 3x3 DFN-10 | H | $2.11 | Yes | ||
| LTC2859IDD#PBF | 3x3 DFN-10 | I | $2.73 | $1.86 | Yes | |
| LTC2859IDD#TRPBF | 3x3 DFN-10 | I | $1.92 | 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.Click here to view our complete list of demo boards
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC2859HDD#PBF | 3x3 DFN-10 | H | $2.93 | $2.05 | Yes | |
| LTC2859HDD#TRPBF | 3x3 DFN-10 | H | $2.11 | Yes | ||
| LTC2859IDD#PBF | 3x3 DFN-10 | I | $2.73 | $1.86 | Yes | |
| LTC2859IDD#TRPBF | 3x3 DFN-10 | I | $1.92 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Low Power RS485/RS422 Transceiver
- Level Translator
- Backplane Transceiver
People Who Viewed This Product Also Viewed
- LTM2881 - Complete Isolated RS485/RS422 μModule Transceiver + Power
- LTC2854 - 3.3V 20Mbps RS485/RS422 Transceiver with Integrated Switchable Termination
- LTC2862 - ±60V Fault Protected 3V to 5.5V RS485/RS422 Transceivers
- LTC4364 - Surge Stopper with Ideal Diode
- LT1761 - 100mA, Low Noise, LDO Micropower Regulators in TSOT-23
- LT4320/LT4320-1 - Ideal Diode Bridge Controller
- LT4363 - High Voltage Surge Stopper with Current Limit
- LT8614 - 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current
- LTC4359 - Ideal Diode Controller with Reverse Input Protection
- LT3060 - 45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator
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.
