SN65HVD21

ACTIVE

Extended Common-mode RS-485 Transceiver

Product details

Number of receivers 1 Number of transmitters 1 Duplex Half 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 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
SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm) PDIP (P) 8 92.5083 mm² (9.81 mm × 9.43 mm)
  • 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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* Data sheet SN65HVD2x Extended Common-Mode RS-485 Transceivers datasheet (Rev. G) PDF | HTML Sep 20, 2022
Application note The RS-485 Unit Load and Maximum Number of Bus Connections Mar 15, 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 (...)
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SN65HVD21 IBIS Model (Rev. A)

SLLC135 (37 KB) - IBIS model
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SOIC (D) 8 Ultra Librarian
PDIP (P) 8 Ultra Librarian

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