Load Capability Lets More Transceivers on the Bus

The SP1486E is a half-duplex differential line transceiver suitable for high-speed bi-directional communication on multi-point bus transmission lines.

Exar’s SP1486E offers a 1/8th load capability, which allows up to 256 transceivers on the communication bus without violating the PROFIBUS specification. This supports high-density industrial control networks.

Further advanced features offer design versatility and robustness for factory applications. The hot-swap capability, for example, avoids shutting down the entire system for each board insertion and extraction. Advanced fail-safe protection minimises noise and parasitic coupling, and can prevent the CMOS inputs from drifting to improper logic levels when the receiver inputs are floating, shorted or open. The device also complies with TIA/EIA-485, TIA/EIA-422 and the IEC61000-4-2 15kV airgap, and 8kV contact-discharge standards.

The transceiver features a 2.7V differential output voltage that allows robust data transmission over longer distances than standard RS-485 transceivers. Additionally, the SP1486E provides a 20Mbit/s data rate and is offered in an 8-pin narrow SOIC for use in industrial and extended temperature ranges.

 

FEATURES High differential-output drive: 2.1V minimum into 54Ω load 5.0V single-supply operation 20 Mbit/s data rate Robust ESD protection for RS-485 pins: ±15kV air-gap discharge ±15kV human-body model ±8kV contact discharge Hot-swap glitch protection on control inputs Receiver fail-safe on open, short or terminated lines Driver short-circuit current limit and thermal shutdown for overload protection 300µA static power consumption 1µA shutdown mode

APPLICATIONS PROFIBUS applications High-speed RS-485 communications Industrial process control Advanced Fieldbus networks Security networks Robotic manufacturing plants Industrial process control Remote sensing and metering

 

Exar / SP1486E