Chip combines UART and RS-232 transceivers for a complete modem interface that reduces board space, cost and component count

2006-06-29

DT Electronics has announced the XR19L220, an integrated device that combines a full-featured single channel, Universal Asynchronous Receiver and Transmitter (UART) with an RS-232 transceiver to provide a complete modem interface. The space-saving device operates from a single 3.3V or 5V supply and is fully compliant with EIA/TIA-232-F standards. Operating at 250 Kbps with a worst-case 3K ohms load, both of the device’s RS-232 outputs and inputs work reliably in harsh electrical environments of up to ±15V. Furthermore, they can survive ±15kV electrostatic discharge on the RS-232 lines while maintaining output levels.

The XR19L220 operates in active, partial sleep, full sleep or power save modes. Each mode can be selected in hardware or software and the RS-232 receivers remain active an all modes. All functions are active in active mode. In partial sleep mode the internal oscillator of the UART or charge pump of the RS-232 transceiver is turned off and in full sleep mode both are turned off. In power save mode, the core logic is isolated from the control signals to further reduce power consumption.

Applications include battery-powered and hand-held devices, point-of-sale systems and industrial peripheral interfaces.

The device comes in a 40-pin QFN package and is available from stock.