UM3085EESA

The UM3085E, UM3088E 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. While partially slew-rate limited UM3088E speeds up to 2.5Mbps. All devices feature enhanced ESD protection. All transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model and 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.

Key features

• RS-485 Transceivers
• Level Translators
• Industrial-Control Local Area Networks
• Transceivers for EMI-Sensitive Applications
• 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-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