Key Specifications
| Part Number | Description | Status | Supply Voltage(Nom)(V) | No. of TX | No. of RX | Duplex | Signaling Rate(Max)(Mbps) | ESD Contact (kV) | ESD Air (kV) | Number of Nodes | Common Mode Range(V) | Fail Safe | ICC(Max) (mA) | Operating TemperatureRange(℃) | Pin/Package | EV Kit Available? |
| UM3085EESA | 具有IEC ESD保护的低功耗，增强型驱动器，半双工RS485收发器 | Active | 5 | 1 | 1 | Half | 0.5 | ±8 | ±15 | 256 | -7 to 12 | Idle, Open, Short | 0.7 | -40 to 85 | 8/SOP | Y |
View All>>
Product Description
The UM3085EESA are ±15kV ESD-protected, high-speed transceiversfor RS-485 communication that contain one driver and one receiver.These devices feature fail-safe circuitry, which guarantees alogic-high receiver output when the receiver inputs are open,shorted or idle. This means that the receiver output will be logichigh if all transmitters on a terminated bus are disabled (highimpedance). The UM3085E features reduced slew-rate driver thatminimizes EMI and reduces reflections caused by improperlyterminated cables, allowing error-free data transmission up to500kbps. The devices feature enhanced ESD protection. Alltransmitter outputs and receiver inputs are protected to ±15kVusing the Human Body Model and IEC61000-4-2, Air-GapDischarge.
The transceivers typically draw 400μA of supply current whenunloaded, or when fully loaded with the drivers disabled. Alldevices have a 1/8-unit-load receiver input impedance that allowsup to 256 transceivers on the bus and are intended for half-duplexcommunications.
Features
- ESD Protection for RS-485 I/O Pins
±15kV—Human Body Model
±15kV—IEC61000-4-2, Air-Gap Discharge
- True Fail-Safe Receiver while Maintaining EIA/TIA-485Compatibility
- Enhanced Slew-Rate Limiting Facilitates Error-Free DataTransmission
- 2nA Low-Current Shutdown Mode
- -7V to +12V Common-Mode Input Voltage Range
- Allows up to 256 Transceivers on the Bus
- Thermal Shutdown
- Current-Limiting for Driver Overload Protection
Typical Operating Circuits
Applications
- RS-485 Transceivers
- Level Translators
- Industrial-Control Local Area Networks
- Transceivers for EMI-Sensitive Applications
Communication Function Table
Table1.Transmitting
INPUTS | OUTPUTS | MODE | ||||||
RE______ | DE | DI | B | A | ||||
X | 1 | 1 | 0 | 1 | Normal | 0 | 1 | 0 |
0 | 0 | X | High-Z | High-Z | ||||
1 | Shutdown | |||||||
X=Don’t care; High-Z=High Impedance
Table2. Receiving
INPUTS | OUTPUTS | A, B | RO | X | >-50mV | 1 | <-200mV | 0 | Inputs Open | X | High-Z Ordering Information
深圳市恩优科技有限公司（ENYO恩优）一直致力于智能电子产品方案设计，以及国际半导体厂家产品在国内的推广、销售。建立了卓越的全球采购渠道，在深圳、香港均自设有仓储物流中心。并取得了上海英联（UNION）、复旦微（FM）、芯天下（XTX）、正基（AMPAK）的代理资格。产品类别包括双路、四路、八路电平转换芯片、RS232和RS485串口芯片、LDO、ESD保护、EEPROM、NORFLASH、NANDFLASH、射频读卡芯片、漏电保护器件等。产品广泛应用于消费类平板电子、汽车电子、安防、Pos机、网络通信、工控电脑、电力电表等行业的应用。 恩优科技ENYO 技术及产品咨询：雷先生， | ||||||||||||