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XR16L651

更新时间： 2024-09-17 04:23:31
品牌 Logo 应用领域
艾科嘉 - EXAR 先进先出芯片
页数 文件大小 规格书
56页 635K
描述
2.25V TO 5.5V UART WITH 32-BYTE FIFO

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XR16L651 数据手册

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áç  
XR16L651  
2.25V TO 5.5V UART WITH 32-BYTE FIFO  
REV. 1.3.0  
JANUARY 2004  
FEATURES  
GENERAL DESCRIPTION  
Added feature in devices with top mark date code of  
"C2 YYWW" and newer:  
The XR16L6511 (651) is a 2.25 to 5.5 volt Universal  
Asynchronous Receiver and Transmitter (UART) with  
5 volt tolerant inputs. This device supports Intel and  
Motorola data bus interfaces and is software  
compatible to industry standard 16C450, 16C550,  
ST16C580 and ST16C650A UARTs.  
■ 0 ns address hold time  
• 2.25 to 5.5 Volt Operation w/ 5 Volt Tolerant Inputs  
• ST16C450/550/580/650A Software Compatible  
• Intel, Motorola or PC Mode 8-bit Bus Interface  
• Up to 3.125 Mbps Data Rate at 5 Volt Operation  
• 32-byte Transmit and Receive FIFOs  
The 651 has 32 bytes of TX and RX FIFOs and is  
capable of operating up to serial data rates of 3.125  
Mbps at 5 volt supply voltage. The internal registers  
include the 16C550 register set plus Exar’s enhanced  
registers for additional features to support today’s  
highly demanding data communication needs. The  
enhanced features include automatic hardware and  
software flow control, selectable TX and RX trigger  
levels, and wireless infrared (IrDA) encoder/decoder.  
• Automatic RS485 Half-Duplex Control Output  
• Automatic Hardware (RTS/CTS) Flow Control  
• Hardware Flow Control Hysteresis  
• Automatic Software (Xon/Xoff) Flow Control  
• Infrared (IrDA) Encoder/Decoder Enable Input  
• Programmable Infrared Encoder Pulse Width  
• Sleep Mode with Wake-up Indicator via interrupt  
The device provides a new capability to give user the  
ability to program the wireless infrared encoder  
output pulse width, hence reducing the power  
consumption of a handheld unit.  
APPLICATIONS  
The XR16L651 device comes in a small 7x7x1mm  
48-pin TQFP package in both the commercial and  
industrial temperature ranges.  
• Battery Operated Electronics  
• Internet Appliances  
NOTE: 1 Covered by US patents #5,649,122.  
• Handheld Terminal  
• Personal Digital Assistants  
• Cellular Phones DataPort  
• Wireless Infrared Data Communications Systems  
FIGURE 1. BLOCK DIAGRAM  
RESET  
A2:A0  
32 Byte TX FIFO  
Transmitter  
TX  
D7:D0  
Infrared Encoder and  
Pulse Width Control  
IOR#  
IOR  
IOW#/R/W#  
Intel,  
CTS Flow  
Control  
UART  
Configuration  
Regs  
IOW  
Motorola  
or PC  
Data Bus  
Interface  
DTR#, DSR#,  
RTS#, CTS#,  
CD#, RI#  
CS2#  
CS1  
CS0  
Modem Control Signals  
RTS Flow  
Control  
Infrared  
Decoder  
INT  
TXRDY#  
Receiver with Auto  
Software Flow Control  
RDRDY#  
DDIS#  
ENIR  
RX  
32 Byte RX FIFO  
BRG  
Prescaler  
IM#  
PCMODE#  
Baud Rate Generator  
Crystal Osc/Buffer  
S1  
S2  
S3  
IRQA  
IRQB  
IRQC  
PC Mode:  
COM 1 to 4  
Decode Logic  
XTAL1/CLK  
XTAL2  
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com  
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