XR3078X数据手册集成电路（IC）的驱动器接收器收发器规格书PDF

描述 Description

The XR3070-78X family of high performance RS-485/422 devices are designed for improved performance in noisy industrial environments and increased tolerance to system faults.
The analog bus pins can withstand direct shorts up to ±18V, and are protected against ESD events up to ±15kV. The differential high output driver delivers 15% higher SNR than standard RS-485/422 devices, affording additional noise margin or extended cable lengths.
The receivers include full fail-safe circuitry, guaranteeing a logic-high receiver output when the receiver inputs are open, shorted, or undriven. The receiver input impedance is at minimum 96kΩ (1/8 unit load), allowing up to 256 devices on the bus while preserving the full signal margin.
The drivers are protected by short circuit detection as well as thermal shutdown, and maintain high impedance in shutdown or when powered off. The XR3070-75X drivers are slew limited for reduced EMI and error-free communication over long or unterminated data cables.
The devices with DE and RE pins include hot swap circuitry to prevent false transitions on the bus during powerup or live insertion, and can enter a 1nA low current shutdown mode for extreme power savings.
The transceivers draw less than 600µA from a +3.3V supply, and typically only 300µA when idling with the receivers active.
For technical support or help choosing a product please email Exar’s Serial Technical Support group at: serialtechsupport@exar.com.

特性 Features

·10% Higher SNR (Signal-to-Noise Ratio) compared to other RS-485 devices (1.65V vs. 1.5V)
·±18V Fault Tolerance on Analog Bus pins
·Robust ESD (ElectroStatic Discharge) Protection:·±15kV IEC 61000-4-2 Air Gap Discharge
·±8kV IEC 61000-4-2 Contact Discharge
·±15kV Human Body Model
·±4kV Human Body Model on non-bus pins

·+3.0V to +3.6V Operation (3.3V ± 10%)
·300µA Idle Current, 1nA Shutdown Current
·Enhanced Receiver Fail-Safe Protection for Open, Shorted, or Terminated but Idle Data Lines
·Hot-Swap Glitch Protection on DE and RE Pins
·Driver Short Circuit Current Limit and Thermal Shutdown for Overload Protection
·1/8th Unit Load Allows up to 256 Devices on Bus
·Industry Standard 8 and 14 NSOIC Packages

应用 Application

·Motor Control
·Security Systems
·Building and Process Automation
·Remote Utility Meter Reading
·Energy Monitoring and Control
·Long or Unterminated Transmission Lines