GENERAL DESCRIPTION
The XR19L202 (L202) is a highly integrated device that combines a full-featured two channel Universal Asynchronous Receiver and Transmitter (UART) and RS-232 transceivers. The L202 is designed to operate with a single 3.3V or 5V power supply. The L202 is fully compliant with EIA/TIA-232-F Standards from a +3.3V to +5.5V power supply. The device operates at 1 Mbps data rate with worst case 3K ohms load. Both RS-232 driver outputs and receiver inputs can operate in harsh electrical environments of +/-15V without damage and can survive multiple +/-15kV ESD on the RS-232 lines, while maintaining RS-232 output levels.
The L202 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 L202 is in the Active mode where the UART and RS-232 transceiver function normally. In the Partial Sleep mode, the internal crystal oscillator of the UART or charge pump of the RS-232 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-232 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 EIA/TIA-232-F Standards from +3.3V to +5.5V operation
•Up to 1 Mbps data transmission rate
•45us sleep mode exit (charge pump to full power)
•ESD protection for RS-232 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


XR19L202IL48

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DESCRIPTION
The ST16C554D is a universal asynchronous receiver and transmitter (UART) with a dual foot print interface. The 554D is an enhanced UART with 16 byte FIFOs, receive trigger levels and data rates up to 1.5Mbps. Onboard status registers provide the user with error indications and operational status, modem interface control. System interrupts may be tailored to meet user requirements. An internal loopback capability allows onboard diagnostics. The 554D is available in 64 pin TQFP, and 68 pin PLCC packages. The 68 pin PLCC package offer an additional 68 mode which allows easy integration with Motorola, and other popular microprocessors. The ST16C554CQ64 (64 pin) offers three state interrupt control while the ST16C554DCQ64 provides constant active interrupt outputs. The 64 pin devices do not offer TXRDY/ RXRDY outputs. The 554D combines the package interface modes of the 16C554 and 68C554 series on a single integrated chip.

FEATURES
· Compatibility with the Industry Standard
  ST16C454, ST68C454, ST68C554, TL16C554
· 1.5 Mbps transmit/receive operation (24MHz)
· 16 byte transmit FIFO
· 16 byte receive FIFO with error flags
· Independent transmit and receive control
· Software selectable Baud Rate Generator
· Four selectable Receive FIFO interrupt trigger levels
· Standard modem interface

ST16C554 ST16C554D ST68C554
TAG UART

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