Product Description

The UM3487E series are +3.3V powered ±15kV ESD protected, fail-safe, hot-swappable, auto polarity reversal RS-485 transceivers. The device includes fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open, shorted or idle. This means that the receiver output will be logic high if all transmitters on a terminated bus are disabled (high impedance). The UM3487E features reduced slew-rate driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. All transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model and IEC61000-4-2, Air-Gap Discharge.

The UM3487E includes cable auto-invert functions that reverse the polarity of the RS485 bus pins in case the cable is misconnected. Receiver’s full fail-safe features are maintained even when the receiver polarity has been reversed.

The transceivers typically draw 300μA of supply current when unloaded, or when fully loaded with the drivers disabled. The device has a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus and is intended for half-duplex communications.

Features

- Automatic Polarity Reversal RS-485 Transceivers

- I/O logic compatible with +5V, +3.3V & +1.8V logic

- ESD Protection for RS-485 I/O Pins

 ±15kV—IEC61000-4-2, Air-Gap Discharge

 ±8kV—IEC61000-4-2, Contact Discharge

- True Fail-Safe Receiver

- Enhanced Slew-Rate Limiting

- –7V to +12V Common-Mode Input Voltage Range

- Allows up to 256 Transceivers on the Bus

- Thermal Shutdown

- Current-Limiting for Driver Overload Protection

 Applications

-Smart Meters/Automated Meter Reading Systems

-Industrial-Control Local Area Networks

-PROFIBUS? and Other RS-485 Based Field Bus Networks

-Building Lighting and Environmental Control Systems

-High Node Count RS-485 Systems

-Transceivers for EMI-Sensitive Applications

創(chuàng)達佳科技有限公司是一家專業(yè)代理和銷售世界各大品牌電子元器件的大型公司。公司成立于2010年,經(jīng)過多年的發(fā)展分支機構(gòu)遍布**,除了位于深圳的總公司外,還在美洲、歐洲、中國香港及北京、上海、浙江設立了分公司。長期以來公司始終堅持“客戶至上,品質(zhì)**”理念,在業(yè)界享有盛譽。經(jīng)營領(lǐng)域涉及：消費類電子,**,電腦及其周邊設備,通信設備,工業(yè)控制,汽車電子,安防,電源控制,新能源,醫(yī)療設備,儀器儀表等。
目前我們代理和經(jīng)銷的品牌有300個,分銷產(chǎn)品線**過3000條。在**有三大倉庫（分布在海外,中國香港,深圳）,保有上億資金的現(xiàn)貨庫存。從產(chǎn)品、技術(shù),服務及賬期方面都可以為客戶提供全方面的支持。