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Exar announces first integrated 8bit UART, RS-232 transceiver

Posted: 07 Apr 2006 ?? ?Print Version ?Bookmark and Share

Keywords:XR19L200? XR19L210? XR19L220? XR19L? Exar?

Exar Corp. unveiled what it touts as the industry's first 8bit UART to implement a 1-Wire Bus Master" target=_blank>Universal Asynchronous Receiver Transmitter (UART) and RS-232 transceiver combination device family.

Integrating functions from two ICs into a space saving package, said the company, the XR19L2xx series targets the growing market demand of consumer and battery powered applications, including laptops and portable devices, desktop PCs, and industrial peripheral interfaces such as handheld terminals and point-of-sale systems.

According to Levent Ozcolak, division vice president and general manager of Exar's interface products division, the XR19L2xx series simplifies the design process because it eliminates acquiring two devices from different vendors. "This coupled with small packaging options and support for three different modem interfaces gives customers confidence in the XR19L2xx series for today's design projects as well as next generation solutions."

The single-channel XR19L2xx series, composed of the XR19L200/210/220, offers different packaging and modem interface options. The XR19L220 is designed for full modem interfaces, which can be used as a standard PC serial port. The XR19L210 supports a half modem interface, and can be used in any application where the legacy modem I/Os are not needed or used. In addition to the TX and RX signals, the RTS and CTS signals are provided to support automatic hardware or software flow control to prevent RX FIFO overrun errors. The XR19L200 targets quarter modem requirements, and is used in any application only needing the TX and RX signals. According to the company, this saves the designer time from having to terminate all of the other unused inputs.

"Anticipating customer requirements for more serial communications capabilities in a smaller silicon foot print, the XR19L2xx series is an industry breakthrough combining two formerly separate functions into a highly- integrated solution," said Eric Nguyen, senior strategic marketing manager for Exar's interface products division. "This new offering reconfirms our continuing focus on technology innovation and puts more distance between Exar's UART products and the competition."

The new chip combination is fully compliant with EIA/TIA-232-F standards from 3V to 5.5V power supply. Both RS-232 driver outputs and receiver inputs can operate in harsh electrical environments of 15V without damage and can survive 15kV ESD on the RS-232 lines while maintaining RS- 232 output levels.

The XR19L200/210/220 devices operate in four different modes: active, partial sleep, full sleep and powersave. Each mode can be invoked via hardware or software. In the active mode, all functions are active. In the partial sleep mode, the internal crystal oscillator or the charge pump is turned off. In full sleep mode, both the internal crystal oscillator and the charge pump are turned off. And in the powersave mode, the core logic is isolated from the control signals. The RS-232 receivers remain active in all four modes.

Additionally, members of the new series support standard serial port drivers as well as Windows CE drivers. With the availability of software drivers and Exar's application support line, said the press release, customers can accelerate their time to market by minimizing driver development, testing and diagnostic procedures.

The XR19L200 is offered in a 32-pin QFN and is priced at $2.60; the XR19L210 is housed in a 40-pin QFN and is available for $2.75; the XR19L220 is packaged in a 40-pin QFN and is priced at $2.80. All pricing are for 1,000-piece quantities. And all devices are available for sampling.

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