XR19L400

www.DataSheet4U.com APRIL 2007 PRELIMINARY XR19L400 REV. P1.0.0 SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER GENERAL DESCRIPTION The XR19L400 (L400) is a highly integrated device that combines a full-featured single channel Universal Asynchronous Receiver and Transmitter (UART) and RS485 transceivers. The L400 is designed to operate with a 3.3V to 5V power supply. The L400 is fully compliant with RS-485 Standards. The L400 operates in four different modes: Active, Partial Sleep, Full Sleep and Power-Save. Each mode can be invoked via hardware or software. Upon power-up, the L400 is in the Active mode where the UART and RS-485 transceiver function normally. In the Partial Sleep mode, the internal crystal oscillator of the UART or charge pump of the RS-485 transceiver is turned off. In Full Sleep mode, both the crystal oscillator and the charge pump are turned off. While the UART is in the Sleep mode, the Power-Save mode isolates the core logic from the control signals (chip select, read/write strobes, address and data bus lines) to minimize the power consumption. The RS-485 receivers remain active in any of these four modes. APPLICATIONS Battery-Powered Equipment Handheld and Mobile Devices Handheld Terminals Industrial Peripheral Interfaces Point-of-Sale (POS) Systems FEATURES Meets true RS-485 Standards from +3.0V to +5.5V operation Up to 8 Mbps data transmission rate 45us sleep mode exit (charge pump to full power) ESD protection for RS-4...