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Overview
Features and Benefits
- 20Mbps or Low EMI 250kbps Maximum Data Rate
- No Damage or Latch-up to ESD: ±15kV 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: 900μA Maximum in Receive Mode
- Compatible with TIA/EIA-485-A Specifications
- Available in 8-Lead and 10-Lead 3mm × 3mm DFN and 8-Lead and 10-Lead MSOP Packages
Product Details
The LTC2856-1, LTC2856-2, LTC2857-1, LTC2857-2, LTC2858-1 and LTC2858-2 are low power, RS485/RS422 transceivers operating on 5V supplies at maximum data rates of 20Mbps or 250kbps for low EMI. The receiver has a 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 thermal shutdown.
Enhanced ESD protection allows these parts to withstand ±15kV (human body model) on the transceiver interface pins without latch-up or damage.
| Part Number | MAX Data Rate (Mbps) | Duplex | Package |
| LTC2856-1 | 20 | Half | MSOP-8, DFN-8 |
| LTC2856-2 | 0.25 | Half | MSOP-8, DFN-8 |
| LTC2857-1 | 20 | Full | MSOP-8, DFN-8 |
| LTC2857-2 | 0.25 | Full | MSOP-8, DFN-8 |
| LTC2858-1 | 20 | Full | MSOP-10, DFN-10 |
| LTC2858-2 | 0.25 | Full | MSOP-10, DFN-10 |
Applications
- Low Power RS485/RS422 Transceiver
- Level Translator
- Backplane Transceiver
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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.
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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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.