LTC2855
3.3V 20Mbps RS485/RS422 Transceiver with Integrated Switchable Termination
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Overview
Features and Benefits
- Integrated, Logic-Selectable 120Ω Termination Resistor
- 3.3V Supply Voltage
- 20Mbps Maximum Data Rate
- No Damage or Latchup Up to ±25kV HBM
- High Input Impedance Supports 256 Nodes (C-, I‑Grade)
- Operation Up to 125°C (H-Grade)
- Guaranteed Fail-safe Receiver Operation Over the Entire Common Mode Range
- Current Limited Drivers and Thermal Shutdown
- Delayed Micropower Shutdown: 5μA Maximum (C-, I-Grade)
- Power Up/Down Glitch-Free Driver Outputs
- Low Operating Current: 370μA Typical in Receive Mode
- Compatible with TIA/EIA-485-A Specifications
- Available in 10-Pin 3mm × 3mm DFN, 12-Pin 4mm × 3mm DFN and 16-Pin SSOP Packages
Product Details
The LTC2854 and LTC2855 are low power, 20Mbps RS485/RS422 transceivers operating on 3.3V supplies. The receiver includes a logic-selectable 120Ω termination, one-eighth unit load supporting up to 256 nodes per bus (C-, I-Grade), and a fail-safe feature that guarantees a high output state under conditions of floating or shorted inputs.
The driver 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 LTC2854 to withstand ±25kV (human body model) and the LTC2855 to withstand ±15kV on the transceiver interface pins without latchup or damage.
| Part Number | Duplex | Package |
| LTC2854 | Half | DFN-10 |
| LTC2855 | Full | SSOP-16, DFN-12 |
Applications
- Low Power RS485/RS422 Transceiver
- Level Translator
- Backplane Transceiver
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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R521 Reliability Data3/26/2018PDF28 K
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RS485 Quick Guide7/13/2017PDF524K
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Ultra Rugged ±60V RS485 Transceivers3/15/2013PDF282K
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Digital Isolation and Interface Technology Selection Guide2/7/2020PDF4 M
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Rugged 3.3V RS485/RS422 Transceivers with Integrated Switchable Termination3/1/2007 LT Journal
Tools & Simulations
IBIS Models
IBS
LTC2855 IBIS Model
99.00K
Design Resources
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LTC2855 Discussions
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