XR19L210_07 Datasheet, PDF (1/43 Pages) Exar Corporation – SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

XR19L210
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
MAY 2007
REV. 1.0.1
GENERAL DESCRIPTION
The XR19L210 (L210) is a highly integrated device that
combines a full-featured single channel Universal
Asynchronous Receiver and Transmitter (UART) and an
RS-232 transceiver. The L210 is designed to operate with a
single 3.3V or 5V power supply. The L210 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 L210 operates in four different modes: Awake, Partial
Sleep, Full Sleep and Power-Save. Each mode can be
invoked via hardware and/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. In the Power-Save mode, the
core logic is isolated from the control signals (chip select,
read/write strobes, address and data bus lines). 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
• Half-modem interface (TXD, RXD, RTS, CTS)
• Sleep and Power-save modes to conserve battery power
• Wake-up interrupt upon exiting low power modes
FIGURE 1. BLOCK DIAGRAM
PwrSave
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
Charge Pump
5K
*5 V
Tolerant
Inputs
UART
RTS#
Modem
I/Os
CTS#
5K
XR19L210
RS-232 Transceiver
VREF+
VREF-
TXD
RXD
RTS
CTS
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com