XR19L200 Datasheet, PDF (1/40 Pages) Exar Corporation – SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

PRELIMINARY
XR19L200
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
APRIL 2006
REV. P1.0.2
GENERAL DESCRIPTION
The XR19L200 (L200) is a highly integrated device that
combines a single channel Universal Asynchronous
Receiver and Transmitter (UART) and an RS-232
transceiver. The L200 is designed to operate with a single
3.3V or 5V power supply. The L200 is fully compliant with
EIA/TIA-232-F Standards from a +3.0V to +5.5V power
supply. The device operates at 250 Kbps 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 L200 operates in three different modes: Awake, Partial
Sleep, and Full Sleep. Each mode can be invoked via
hardware or software. In the Awake mode, all functions are
active. In the Partial Sleep mode, the internal crystal
oscillator or charge pump is turned off. In Full Sleep mode,
the internal crystal oscillator and the charge pump is shut
down. All 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 a 3.0 V to 5.5V
operation
• Up to 250 Kbps 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 1000-4-2, Air-Gap Discharge
■ +/- 8kV - IEC 1000-4-2, Contact Discharge
• Software compatible with industry standard 16550 UART
• Intel/Motorola bus select
• Quarter-modem interface (TXD, RXD)
• Sleep modes to conserve battery power
• Wake-up interrupt upon exiting low power modes
FIGURE 1. BLOCK DIAGRAM
A2:A0
D7:D0
IOR#
IOW# (R/W#)
CS#
INT (IRQ#)
RESET (RESET#)
I/M#
Crystal
Osc/Buffer
BRG
16 Byte
TX FIFO
TX
16 Byte
RX
RX FIFO
*5 V
Tolerant
Inputs
UART
Modem
I/Os
XR19L200
Charge Pump
5K
VREF+
VREF-
TXD
RXD
RS-232 Transceiver
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com