THVD1551DGKR

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1. Description

THVD15xx is a family of noise-immune RS-485/RS422 transceivers designed to operate in rugged industrial environments. The bus pins of these devices are robust to high levels of IEC electrical fast transients (EFT) and IEC electrostatic discharge (ESD) events, eliminating the need for additional system-level protection components. Each of these devices operates from a single 5-V supply. The devices in this family feature an extended common-mode voltage range which makes them suitable for multi-point applications over long cable runs. THVD15xx family of devices is available in small VSSOP packages for space-constrained applications. These devices are characterized over ambient freeair temperatures from –40°C to 125°C.

2. Features

    1. Meets or Exceeds the Requirements of the TIA/EIA-485A Standard

    2. 4.5 V to 5.5 V Supply Voltage

    3. Integrated Bus I/O Protection

        – ± 30 kV HBM ESD

        – ± 18 kV IEC 61000-4-2 ESD Contact Discharge

        – ± 25 kV IEC 61000-4-2 ESD Air-Gap Discharge

        – ± 4 kV IEC 61000-4-4 Electrical Fast Transient

    4. Extended Operational Common-mode: ± 15 V

    5. Low EMI 500 kbps and 50 Mbps Data Rates

    6. Extended Temperature Range: -40°C to 125°C

    7. Large Receiver Hysteresis for Noise Rejection

    8. Low Power Consumption

        – Low Standby Supply Current: < 1 µA

        – Current During Operation: < 1 mA

    9. Glitch-Free Power-Up/Down for Hot Plug-in Capability

  10. Open, Short, and Idle Bus Failsafe

  11. 1/8 Unit Load Options (Up to 256 Bus Nodes)

  12. Small-Size VSSOP Packages Save Board Space or SOIC for Drop-in Compatibility

3. Applications

    1. Motor Drives

    2. Factory Automation and Control

    3. Grid Infrastructure

    4. Building Automation

    5. HVAC Systems

    6. Video Surveillance

    7. Process Analytics

    8. Telecom Infrastructure

4. Password configuration

5. Detailed description

6. Feature Description

Internal ESD protection circuits of the THVD15xx protect the transceivers against electrostatic discharges (ESD) according to IEC 61000-4-2 of up to ±18 kV and against electrical fast transients (EFT) according to IEC 61000- 4-4 of up to ±4 kV. With careful system design, one could achieve ±4 kV EFT Criterion A (no data loss when transient noise is present). The THVD15xx device family provides internal biasing of the receiver input thresholds in combination with large input-threshold hysteresis. The receiver output remains logic high under a bus-idle or bus-short conditions without the need for external failsafe biasing resistors. Device operation is specified over a wide ambient temperature range from –40°C to 125°C.

7. Application Information

The THVD1551DGKR family consists of half-duplex and full-duplex RS-485 transceivers commonly used for asynchronous data transmissions. For half-duplex devices, the driver and receiver enable pins allow for the configuration of different operating modes. Full-duplex implementation requires two signal pairs (four wires), and allows each node to transmit data on one pair while simultaneously receiving data on the other pair.