特性 Features

? Integrated Transient Voltage Suppressor

(TVS) in the Transceiver IC

? TVS Protection for Bus Terminals :

±15 kV IEC 61000-4-2, Contact Discharge

±18 kV IEC 61000-4-2, Air-Gap Discharge

±15 kV EIA/JEDEC Human Body Model

? HBM ±8kV ESD Protection for all pins

? MM ±800V ESD Protection for all pins

? Latchup immunity up to ±400mA for all pins.

? High CDM protection up to ±1kV for all pins.

? Meet the Requirements of the EIA/TIA-485

Standards with 5V Power Supply

? True Fail-Safe Receiver While Maintaining

EIA/TIA-485 Compatibility

? Data Rate up to 10Mbps

Hot-Swap Glitch free Protection on Control

Inputs

? High driving ability of VOD2 up to 2.3V

? Up to 256 Transceivers on the Bus

Applications

? Energy Meter

? Industrial Automation

? Building Automation

? Telecommunications Equipment

描述 Description

The AZRS485E is a ±15kV IEC 61000-4-2

contact discharge protected half-duplex RS485

transceiver IC, which contains one transmitter

and one receiver inside. This device is fully

compliant with the EIA/TIA-485 standard with 5V

power supply.

The AZRS485E features a fail-safe receiver,

which guarantees the output of the receiver to be

logic high when the differential inputs (bus pins, A

and B) of the receiver are open, short or idle

under abnormal operating conditions.

The AZRS485E features a hot-swap glitch-free

design which guarantees outputs of the

transmitter and the receiver in a high impedance

state and even no short current event during the

power up period. The AZRS485E has the thermal

shutdown and the current limited function in the

transmitter to protect the device from damage by

system fault conditions during normal operating

condition. The AZRS485E is designed 1/8 unit

load with minimum 96kohm of input impedance,

which can connect 256 devices on a bus at least.

The AZRS485E is also a high reliable device with

built-in system level ESD protected devices

against high-energy noise transients without

requiring any external components.