Transceivers provide reliable communications

The SP4082E transceiver targets remote E-metering monitoring, building automation, HVAC controls, security camera systems and applications on long or un-terminated transmission lines.

Exar has released the SP4082E 5V RS-485/RS-422 half duplex transceiver, which complements Exar's SP308x family of transceivers.

The SP4082E, when added to Exar's full serial transceiver product portfolio, gives customers a wide variety of options for their designs.

The SP4082E targets remote E-metering monitoring, building automation, HVAC controls, security camera systems and applications on long or un-terminated transmission lines.

"The SP4082E offers robust features and functions appropriate for applications that require optimal system performance vs cost", said Hensen Wong, technical Marketing Manager, Interface Products.

"Furthermore, the SP4082E was designed for harsh environments where device reliability and sustained performance is critical".

The SP4082E is designed for reliable, bidirectional communication on multipoint bus transmission lines and contains one differential driver and one differential receiver.

It supports the entire common-mode voltage range from -7V to +12V.

Receivers are designed to fail-safe to a logic high output state if the inputs are left un-driven or shorted.

In addition, all receivers have exceptionally high input impedance, which places only 1/8th the standard load on a shared bus.

All RS-485 bus-pins are protected against severe ESD events up to +/-15kV (human body model).

Drivers are protected from excess current flow caused by bus contention or output short-circuits by both an internal current limit and a thermal-overload shutdown.

Up to 256 transceivers may co-exist while preserving full signal margin.

The device is compliant with TIA/EIA-485 and TIA/EIA-422 standards.

The device operates from a single 5.0V power supply and draws negligible quiescent power.

The device can independently enable and disable the driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled.

All outputs maintain high impedance in shutdown or when powered-off.

For chip-to-chip or system-to-system connections, Exar's single and multichannel interface ICs provide immediate competitive advantages to designers, including low power, a reduction in board space requirements and increased bandwidth capacity.

Interface devices are found in point-of-sale (POS) terminals, digital televisions, industrial automation equipment, handheld devices and networking environments.

Samples of the SP4082E are available now in an eight-pin SOIC package, supporting the -40C to +85C temperature range.

Back to top