Industry Firsts Integrated UART and RS-485
Product Family

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XR19L400

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 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.

 

FEATURES Meets true RS-485 standards from +3.0V to +5.5V operation Up to 8 Mbps data transmission rate 45µs sleep mode exit (charge pump to full power) ESD protection for RS-485 I/O pins at +/-15kV - Human Body Model +/-15kV - IEC 61000-4-2, Air-Gap Discharge +/- 8kV - IEC 61000-4-2, Contact 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

APPLICATIONS Battery powered equipment Handheld and mobile devices Handheld terminals Industrial peripheral interfaces Point-of-sale (POS) systems

 

 

XR19L402

The XR19L402 (L402) is a highly integrated device that combines a full featured two channel Universal Asynchronous Receiver and Transmitter (UART) and RS-485 transceivers. The L402 is designed to operate with a single 3.3V to 5V power supply. The L402 is fully compliant with RS-485 standards.

The L402 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 L402 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.

 

FEATURES Meets true RS-485 standards from +3.0V to +5.5V operation Up to 8 Mbps data transmission rate 45µs sleep mode exit (charge pump to full power) ESD protection for RS-485 I/O pins at +/-15kV - Human Body Model +/-15kV - IEC 61000-4-2, Air-Gap Discharge +/- 8kV - IEC 61000-4-2, Contact 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

APPLICATIONS Battery powered equipment Handheld and mobile devices Handheld terminals Industrial peripheral interfaces Point-of-sale (POS) systems

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
XR19L400IL40-F		Single Channel Integrated UART and RS-485 Transceiver
XR19L402IL48-F		Two Channel Integrated UART and RS-485 Transceiver

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