LTC1689 - 100Mbps RS485 Hot Swapable Quad Drivers
Features
- Ultrahigh Speed:100Mbps
- Guaranteed Propagation Delay: 8ns ±4ns Over Temperature
- Low Channel-to-Channel Skew: 500ps Typ
- Hot Swap™ Capable
- 50Mbps Operation with VDD = 3V
- Low tPLH/tPHL Skew: 500ps Typ
- Driver Outputs Maintain High Impedance in Three-State or with Power Off
- Short-Circuit Protected: 3mA Typ Output Current for an Indefinite Short
- Thermal Shutdown Protected
- Single 5V or 3V Supply
- Pin Compatible with LTC486/LTC487
Typical Application
Description
The LTC®1688/LTC1689 are ultrahigh speed, differential bus/line drivers that can operate at data rates up to 100Mbps. Propagation delay is guaranteed at 8ns ±4ns over the full operating temperature range. These devices operate over the full RS485 common mode range (–7V to 12V), and also meet RS422 requirements.
The driver outputs are Hot Swap capable, maintaining backplane data integrity during board insertion and removal. The drivers feature three-state outputs, maintaining high impedance over the entire common mode range (– 7V to 12V). Outputs also remain high impedance during power-up and with the power off. A short-circuit feature detects bus contention and substantially reduces driver output current. Thermal shutdown circuitry protects the parts from excessive power dissipation.
The LTC1688 allows all four drivers to be enabled together, while the LTC1689 allows two drivers at a time to be enabled.
The LTC1688/LTC1689 operate from a single 5V or 3V supply and draw only 9mA of supply current.
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 |
|---|---|---|---|---|---|
| LTC1689CS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1689CS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1689IS#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC1689IS#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1689CS#PBF | SO-16 | C | $5.80 | $4.95 | Yes | |
| LTC1689CS#TRPBF | SO-16 | C | $5.01 | Yes | ||
| LTC1689IS#PBF | SO-16 | I | $7.75 | $5.65 | Yes | |
| LTC1689IS#TRPBF | SO-16 | I | $5.71 | 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
Applications
- High Speed RS485 Twisted-Pair Drivers
- High Speed Backplane Drivers
- Complementary Clock Drivers
- STS-1/OC-1 Data Drivers
- SCSI Drivers
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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.
