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RF/Microwave??

Transceivers handle up to 32Mbit/s apps

Posted: 07 May 2009 ?? ?Print Version ?Bookmark and Share

Keywords:transceiver? network? receiver? 32Mbit/s data rate?

Exar Corp. has launched the SP349xE family of high-speed 3.3V RS-485/RS-422 transceivers. With standard pin out compatibility, the SP3495E, SP3496E, and SP3497E not only support current 20Mbit/s applications, but can be extended to 32Mbit/s levels for next generation industrial automation, security networks, process control, plant environmental control, remote sensing and metering applications.

All three devices are suitable for high-speed bidirectional communication on multipoint and multidrop bus transmission lines. They are designed for balanced data transmission and comply with both RS-485 and RS-422 EIA standards. Each device contains one differential driver and one differential receiver. The family offers several choices: half-duplex, full-duplex or full-duplex with enable/shutdown. Separate enable pins control the driver and receiver independently or may be externally connected together as a direction control.

The series operates from a single 3.3V power supply and loads the data bus only half as much as a standard RS-485 unit-load. This allows up to 64 devices to be connected simultaneously on a bus without violating required RS-485 signal margin and without using repeaters. Excessive power dissipation caused by bus contention or by shorting outputs to ground or a voltage source is prevented by short circuit protection and thermal shutdown. This feature forces the driver output into high impedance state if the absolute value of the output current exceeds 250mA or if junction temperature exceeds 165C.

Pricing of the SP349xE family in 1,000-piece quantities is $1.25. Samples of the SP3495E and SP3496E are available now in an 8-pin SOIC package supporting the -40C to +85C temperature range. Samples of the SP3497E are available in a 14-pin SOIC package supporting the -40C to +85C temperature range. Lead-free and RoHS compliant packages are available.

- Ismini Scouras
eeProductCenter





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