Key Specifications

 

The UM3085EESA are ±15kV ESD-protected, high-speed transceivers for RS-485 communication that contain one driver and one receiver. These devices feature 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 UM3085E features reduced slew-rate driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. The devices feature enhanced ESD protection. All transmitter outputs and receiver inputs are protected to ±8kV using the Human Body Model and ±15kV using the IEC61000-4-2, Air-Gap Discharge.

The transceivers typically draw 400μA of supply current when unloaded, or when fully loaded with the drivers disabled. All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus and are intended for half-duplex communications.

 

- ESD Protection for RS-485 I/O Pins

  ±8kV—Human Body Model

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

- True Fail-Safe Receiver while Maintaining EIA/TIA-485 Compatibility

- Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission

- 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

  

 

 

- RS-485 Transceivers

- Level Translators

- Industrial-Control Local Area Networks

- Transceivers for EMI-Sensitive Applications

Table1. Transmitting                       

X=Don’t care; High-Z=High Impedance

Table2. Receiving

X=Don’t care; High-Z=High Impedance

 

Part Number	Operating Temperature	Mark Code	Package Type	Shipping Qty
UM3085EESA	-40°C to +85°C	UM3085EESA	SOP8	3000pcs/13 Inch Tape & Reel