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SN65HVD21

ACTIVE

Extended Common-mode RS-485 Transceiver

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Data sheet

SN65HVD21

ACTIVE
Data sheet Order now

Product details

Number of receivers 1 Number of transmitters 1 Duplex Half Supply voltage (nom) (V) 5 Signaling rate (max) (Mbps) 5 Fault protection (V) -27 to 27 Common-mode range (V) -20 to 25 Number of nodes 256 Features Extended common mode Isolated No Supply current (max) (µA) 12000 Rating Catalog Operating temperature range (°C) -40 to 85
Number of receivers 1 Number of transmitters 1 Duplex Half Supply voltage (nom) (V) 5 Signaling rate (max) (Mbps) 5 Fault protection (V) -27 to 27 Common-mode range (V) -20 to 25 Number of nodes 256 Features Extended common mode Isolated No Supply current (max) (µA) 12000 Rating Catalog Operating temperature range (°C) -40 to 85
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 8 29.4 mm² 4.9 x 6
  • Common-mode voltage range (–20 V to 25 V) more than doubles TIA/EIA-485 requirement
  • Receiver equalization extends cable length, signaling rate (SN65HVD2[3,4])
  • Reduced unit-load for up to 256 nodes
  • Bus I/O protection to over 16-kV HBM
  • Failsafe receiver for open-circuit, short-circuit, and idle-bus conditions
  • Low standby supply current 1 µA (maximum)
  • More than 100 mV receiver hysteresis
  • Common-mode voltage range (–20 V to 25 V) more than doubles TIA/EIA-485 requirement
  • Receiver equalization extends cable length, signaling rate (SN65HVD2[3,4])
  • Reduced unit-load for up to 256 nodes
  • Bus I/O protection to over 16-kV HBM
  • Failsafe receiver for open-circuit, short-circuit, and idle-bus conditions
  • Low standby supply current 1 µA (maximum)
  • More than 100 mV receiver hysteresis

The transceivers in the SN65HVD2x family offer performance far exceeding typical RS-485 devices. In addition to meeting all requirements of the TIA/EIA ‑485-A standard. The SN65HVD2x family operates over an extended range of common-mode voltages and has features such as high ESD protection, wide receiver hysteresis, and failsafe operation. This family of devices is designed for long-cable networks, and other applications where the environment is too harsh for ordinary transceivers.

These devices are designed for bidirectional data transmission on multipoint twisted-pair cables. Example applications are digital motor controllers, remote sensors and terminals, industrial process control, security stations, and environmental control systems.

These devices combine a 3-state differential driver and a differential receiver that operate from a single 5-V power supply. The driver differential outputs and the receiver differential inputs are connected internally to form a differential bus port that offers minimum loading to the bus. This port features an extended common-mode voltage range, making the device suitable for multipoint applications over long cable runs.

The transceivers in the SN65HVD2x family offer performance far exceeding typical RS-485 devices. In addition to meeting all requirements of the TIA/EIA ‑485-A standard. The SN65HVD2x family operates over an extended range of common-mode voltages and has features such as high ESD protection, wide receiver hysteresis, and failsafe operation. This family of devices is designed for long-cable networks, and other applications where the environment is too harsh for ordinary transceivers.

These devices are designed for bidirectional data transmission on multipoint twisted-pair cables. Example applications are digital motor controllers, remote sensors and terminals, industrial process control, security stations, and environmental control systems.

These devices combine a 3-state differential driver and a differential receiver that operate from a single 5-V power supply. The driver differential outputs and the receiver differential inputs are connected internally to form a differential bus port that offers minimum loading to the bus. This port features an extended common-mode voltage range, making the device suitable for multipoint applications over long cable runs.
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Technical documentation

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Type Title Date
* Data sheet SN65HVD2x Extended Common-Mode RS-485 Transceivers datasheet (Rev. G) PDF | HTML 20 Sep 2022
EVM User's guide RS-485 Half-Duplex EVM User's Guide (Rev. C) PDF | HTML 01 Sep 2021
Application note The RS-485 Unit Load and Maximum Number of Bus Connections 15 Mar 2004

Design & development

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Evaluation board

RS485-HF-DPLX-EVM — RS-485 half-duplex evaluation module

The RS-485 half-duplex evaluation module (EVM) helps designers evaluate device performance, supporting fast development and analysis of data-transmission systems using any of the SN65HVD1x, SN65HVD2x, SN65HVD7x, SN65HVD8x and SN65HVD96 half-duplex transceivers. The EVM board comes without the (...)
User guide: PDF | HTML
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Evaluation board

SN65HVD22EVM — SN65HVD22EVM evaluation module

The SN65HVD22EVM evaluation module (EVM) helps you develop and analyze data transmission systems using our SN65HVD2x family of devices. This series of devices, including the SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23 and SN65HVD24, complies with TIA/EIA-485. These devices also use (...)

User guide: PDF
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Simulation model

SN65HVD21 IBIS Model (Rev. A)

SLLC135A.ZIP (8 KB) - IBIS Model
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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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