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XR19L400IL40 Datasheet(PDF) 1 Page - Exar Corporation |
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XR19L400IL40 Datasheet(HTML) 1 Page - Exar Corporation |
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1 / 46 page  Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XR19L400 SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER JULY 2009 REV. 1.0.3 GENERAL DESCRIPTION The XR19L400 (L400) is a highly integrated device that combines a full-featured single channel Universal Asynchronous Receiver and Transmitter (UART) and RS- 485 transceivers. The L400 is designed to operate with a single 3.3V or 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 at 3.3V or 5V operation • Up to 8 Mbps data transmission rate • 45us sleep mode exit (charge pump to full power) • ESD protection for RS-485 I/O pins at ■ +/-15kV - Human Body Model ■ +/- 8kV - IEC 61000-4-2, Contact Discharge ■ +/- 15kV - IEC 61000-4-2, Air-Gap Discharge • Software compatible with industry standard 16550 UART • Intel/Motorola bus select • Complete modem interface • Sleep and Power-save modes to conserve battery power • Wake-up interrupt upon exiting low power modes FIGURE 1. BLOCK DIAGRAM XR19L400 UART RS-485 Transceiver PwrSave A2:A0 D7:D0 IOR# IOW# (R/W#) CS# (CS#) INT (IRQ#) RESET (RESET#) I/M# Crystal Osc/Buffer BRG 64 Byte TX FIFO 64 Byte RX FIFO Modem I/Os CTS# DSR# RI# Charge Pump *5 V Tolerant Inputs CD# VCC33 RX RX+ RX- TX TX+ TX- HALF/FULL# |
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