XR19L212 datasheet(1/52 Pages) EXAR | TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

1 page

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

XR19L212

TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

MAY 2007

REV. 1.0.0

GENERAL DESCRIPTION

The XR19L212 (L212) is a highly integrated device that

combines

full-featured

two

channel

Universal

Asynchronous Receiver and Transmitter (UART) and RS-

232 transceivers. The L212 is designed to operate with a

single 3.3V or 5V power supply. The L212 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 L212 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

L212 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

FIGURE 1. BLOCK DIAGRAM

XR19L212

UART

RS-232 Transceiver

PwrSave

A2:A0

D7:D0

IOR#

IOW# (R/W#)

CSA# (CS#)

CSB#

INTA (IRQ#)

INTB

RESET (RESET#)

I/M#

Crystal

Osc/Buffer

BRG

64 Byte

TX & RX

FIFO

Modem

I/Os

TXA

RXA

RTSA#

CTSA#

Charge Pump

TXDA

RTSA

RXDA

CTSA

*5 V Tolerant

Inputs

VREF+

VREF-

Channel B

CTSB#

Channel A

RTSB#

TXB

RXB

Channel B

Transceiver

Ch A Transceiver

RXBSEL

CTSB

RTSB

TXDB

TXB

RXDB

RXB

(See Figure 6)

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