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 3.3V Power Supply
 True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
 Data Rate up to 16Mbps
 Hot-Swap Glitch free Protection on Control
Inputs
 Up to 256 Transceivers on the Bus
Applications
 Telecommunications Equipment
 Security System
 Building Automation Networks
Description
The AZRS3078 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
3.3V power supply.
The AZRS3078 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 AZRS3078 features a hot-swap glitch-free
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 AZRS3078 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 AZRS3078 is designed 1/8 unit load with
minimum 96kohm of input impedance, which can
connect 256 devices on a bus at least. The
AZRS3078 is also a high reliable device with
built-in system level ESD protected devices
against high-energy noise transients without
requiring any external components.