Intersil ISL32704E低成本隔离RS－485收发器解决方案

Intersil公司的ISL32704E是电流隔离的差分总线收发器,总线的每端A和B ESD保护高达±15kV,设计用于平衡通信的双向数据传输,满足RS-485和RS-422标准,数据速率达4Mbps,电源电压3-5V,隔离层寿命达4400年,主要用在工厂自动化,安全网络,工业/过程控制网络,以及建筑环境控制系统,电平转换如RS-232到RS-485等.本文介绍了ISL32704E主要特性,应用框图和高速RS-485应用框图,以及评估板ISL32704EVAL1Z 主要特性,框图,电路图,材料清单和PCB设计图.
The ISL32704E is a galvanically isolated, differential bus transceiver designed for bidirectional data transmission and meeting the RS-485 and RS-422 standards for balanced communication. Each of the bus terminals, A and B, is protected against ±15kV ESD strikes without latch-up.
The device uses Giant Magnetoresistance (GMR) as isolation technology. A unique ceramic/polymer composite barrier provides excellent isolation and virtually unlimited barrier life.
The part is available in a 16 Ld QSOP package, offering unprecedented miniaturization.
The ISL32704E delivers a minimum differential output voltage of 1.5V into a 54Ω differential load for excellent data integrity over long cable lengths.
The device is compatible with 3V and 5V input supplies, allowing interface to standard microcontrollers without additional level shifting.
Current limiting and thermal shutdown features protect against output short circuits and bus contention that may cause excessive power dissipation. Receiver inputs feature a “fail-safe if open” design, ensuring a logic high R-output if A/B are floating.
ISL32704E主要特性:
4Mbps data rate
2.5kVRMS isolation per UL 1577
600VRMS working voltage per VDE 0884
3V to 5V power supplies
Single unit load allows up to 32 devices on the bus
50kV/μs (typical), 30kV/μs (minimum) common-mode transient immunity
44000 years barrier life
15kV ESD bus-pin protection
Low EMC footprint
Thermal shutdown protection
-40°C to +85°C temperature range
Meets or exce...