SN65HVD21A - 扩展共模 RS-485 收发器

SN65HVD21A是TI德州仪器公司的一款无产品，SN65HVD21A是扩展共模 RS-485 收发器，本站介绍了SN65HVD21A的封装应用图解、特点和优点、功能等，并给出了与SN65HVD21A相关的TI元器件型号供参考。

SN65HVD21A - 扩展共模 RS-485 收发器 - 无 - RS-485收发器 - 德州仪器

产品描述

The SN65HVD21A offers performance far exceeding typical RS−485 devices. In addition to meeting all requirements of the TIA/EIA−485−A standard, the device operates over an extended range of common-mode voltage, and has features such as high ESD protection, wide receiver hysteresis, and failsafe operation. This device is ideally suited for long-cable networks, and other applications where the environment is too harsh for ordinary transceivers.

The device is 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.

The device combines a 3-state differential driver and a differential receiver, which 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 SN65HVD21A allows up to 256 connected nodes at moderate data rates (up to 6 Mbps). The driver output slew rate is controlled to provide reliable switching with shaped transitions which reduce high-frequency noise emissions.

The receivers also include a failsafe circuit that provides a high-level output within 250 microseconds after loss of the input signal. The most common causes of signal loss are disconnected cables, shorted lines, or the absence of any active transmitters on the bus. This feature prevents noise from being received as valid data under these fault conditions. This feature may also be used for Wired-Or bus signaling.

The SN65HVD21A is characterized for operation over the temperature range of –40°C to 85°C.

产品特性

Common-Mode Voltage Range (–20 V to 25 V) More Than Doubles TIA/EIA-485 Requirement
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 Max
More Than 100 mV Receiver Hysteresis
APPLICATIONS
- Long Cable Solutions
  - Factory Automation
  - Security Networks
  - Building HVAC
- Severe Electrical Environments
  - Electrical Power Inverters
  - Industrial Drives
  - Avionics

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