XR19L400 - Exar Corporation

XR19L400 SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER

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 .

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-485 I/O pins at
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■ +/-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 VCC33 XTAL1 XTAL2 R_EN GND VCC50 ACP C.