Datasheet > XR19L210_07

XR19L210_07

更新时间： 2024-11-22 03:53:03

品牌	Logo	应用领域
艾科嘉 - EXAR		/
页数	文件大小	规格书
43页	856K
描述
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

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XR19L210_07 数据手册

XR19L210

SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

MAY 2007

REV. 1.0.1

APPLICATIONS

GENERAL DESCRIPTION

• Battery-Powered Equipment

• Handheld and Mobile Devices

• Handheld Terminals

• Industrial Peripheral Interfaces

• Point-of-Sale (POS) Systems

The XR19L210 (L210) is a highly integrated device that

combines

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.

FEATURES

• Meets true EIA/TIA-232-F Standards from a 3.0 V to 5.5V

operation

• Up to 250 Kbps data transmission rate

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.

• 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

VREF+

Crystal

Osc/Buffer

PwrSave

BRG

16 Byte

Charge Pump

A2:A0

VREF-

TXD

D7:D0

IOR#

TX FIFO

16 Byte

RX FIFO

RXD

IOW# (R/W#)

CS#

INT (IRQ#)

RESET (RESET#)

I/M#

RTS#

CTS#

RTS

CTS

Modem

I/Os

*5 V

Tolerant

Inputs

UART

RS-232 Transceiver

XR19L210

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

12 3 4 5 6 7...43

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