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XR19L212IL48-F PDF预览

XR19L212IL48-F

更新时间： 2024-11-22 22:53:31
品牌 Logo 应用领域
艾科嘉 - EXAR /
页数 文件大小 规格书
52页 994K
描述
IC UART/TXRX RS232 48QFN

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XR19L212IL48-F 数据手册

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XR19L212  
TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER  
JULY 2007  
REV. 1.0.1  
APPLICATIONS  
GENERAL DESCRIPTION  
•
•
•
•
•
Battery-Powered Equipment  
Handheld and Mobile Devices  
Handheld Terminals  
The XR19L212 (L212) is a highly integrated device that  
combines  
a
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.  
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  
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.  
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  
F
IGURE 1. BLOCK DIAGRAM  
VREF+  
Charge Pump  
*5 V Tolerant  
Inputs  
Crystal  
Osc/Buffer  
PwrSave  
A2:A0  
BRG  
VREF-  
TXDA  
64 Byte  
TX & RX  
FIFO  
TXA  
RXA  
D7:D0  
RXDA  
5K  
IOR#  
IOW# (R/W#)  
CSA# (CS#)  
CSB#  
RTSA#  
CTSA#  
RTSA  
CTSA  
Modem  
I/Os  
5K  
INTA (IRQ#)  
INTB  
Channel A  
Ch A Transceiver  
CTSB#  
CTSB  
RTSB  
RESET (RESET#)  
I/M#  
RTSB#  
TXB  
Channel B  
Channel B  
Transceiver  
TXDB  
TXB  
RXDB  
RXB  
RXB  
(See Figure 6)  
RXBSEL  
UART  
RS-232 Transceiver  
XR19L212  
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com  
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