Datasheet > 微控制器和处理器 > 串行 IO/通信控制器> XR16L2550

XR16L2550

更新时间： 2024-09-16 22:41:15

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
45页	269K
描述
LOW VOLTAGE DUART WITH 16-BYTE FIFO

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XR16L2550 数据手册

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XR16L2550

LOW VOLTAGE DUART WITH 16-BYTE FIFO

SEPTEMBER 2003

REV. 1.0.0

FEATURES

GENERAL DESCRIPTION

• 2.25 to 5.5 Volt operation

• 5 Volt tolerant inputs

The XR16L2550¹(L2550) is a dual universal

asynchronous receiver and transmitter (UART). The

XR16L2550 is an improved version of the

ST16C2550 UART with lower operating voltages and

5 volt tolerant inputs. The L2550 provides enhanced

UART functions with 16 byte FIFOs, a modem control

interface and data rates up to 4 Mbps. Onboard

status registers provide the user with error indications

and operational status. System interrupts and modem

control features may be tailored by external software

to meet specific user requirements. Independent

programmable baud rate generators are provided to

select transmit and receive clock rates up to 3.125

Mbps. The Baud Rate Generator can be configured

for either crystal or external clock input. An internal

loopback capability allows onboard diagnostics. The

L2550 is available in a 44-pin PLCC, 48-pin TQFP

and 32-pin QFN packages. The L2550 is fabricated in

an advanced CMOS process.

• Pin-to-pin compatible to Exar’s ST16C2450,

ST16C2550 and XR16L2750 in 44-PLCC and 48-

TQFP packages

• Pin-to-pin compatible to XR16C2850 in 44-PLCC

• Pin alike XR16L2551, XR16L2751 and XR16C2850

in 48-TQFP package

• Two independent UART channels

■ Up to 3.125Mbps with external clock of 50 MHz

■ Register Set compatible to 16C550

■ 16 byte Transmit FIFO to reduce the bandwidth

requirement of the external CPU

■ 16 byte Receive FIFO with error tags to reduce

the bandwidth requirement of the external CPU

■ 4 selectable Receive FIFO interrupt trigger

NOTE: 1 Covered by U.S. Patent #5,649,122.

levels

APPLICATIONS

■ Automatic RTS/CTS hardware flow control

■ Automatic Xon/Xoff software flow control

■ Wireless infrared encoder/decoder

• Portable Appliances

• Medical Monitors

■ Full Modem Interface (CTS#, RTS#, DSR#,

• Base Stations

DTR#, RI#, CD#)

• Micro Servers

■ Programmable character lengths (5, 6, 7, 8)

• Telecommunication Network Routers

• Industrial Automation Controls

with even, odd, or no parity

• Tiny 32-QFN, no lead package (5x5x0.9mm)

• 44-PLCC and 48-TQFP packages also available

FIGURE 1. XR16L2550 BLOCK DIAGRAM

2.25 to 5.5 Volt VCC

GND

* 5 Volt Tolerant Inputs

A2:A0

D7:D0

IOR#

IOW#

UART Channel A

16 Byte TX FIFO

UART

TXA, RXA, DTRA#,

DSRA#, RTSA#,

DTSA#, CDA#, RIA#,

OP2A#

CSA#

CSB#

Regs

TX & RX

8-bit Data

Bus

Interface

INTA

INTB

BRG

16 Byte RX FIFO

TXRDYA#

TXRDYB#

RXRDYA#

RDRXYB#

TXB, RXB, DTRB#,

DSRB#, RTSB#,

CTSB#, CDB#, RIB#,

OP2B#

UART Channel B

(same as Channel A)

Reset

XTAL1

XTAL2

Crystal Osc/Buffer

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

12 3 4 5 6 7...45

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与XR16L2550相关器件

型号	品牌	获取价格	描述	数据表
XR16L2550_07	EXAR	获取价格	LOW VOLTAGE DUART WITH 16-BYTE FIFO
XR16L2550IJ	EXAR	获取价格	LOW VOLTAGE DUART WITH 16-BYTE FIFO
XR16L2550IJ-F	EXAR	获取价格	Serial I/O Controller, 2 Channel(s), 0.390625MBps, CMOS, PQCC44, GREEN, PLASTIC, LCC-44
XR16L2550IJTR-F	EXAR	获取价格	Serial I/O Controller, CMOS, PQCC44
XR16L2550IL	EXAR	获取价格	LOW VOLTAGE DUART WITH 16-BYTE FIFO
XR16L2550IL-F	EXAR	获取价格	Serial I/O Controller, 2 Channel(s), 0.390625MBps, CMOS, 5 X 5 MM, 0.90 MM HEIGHT, GREEN,
XR16L2550ILTR-F	EXAR	获取价格	Serial I/O Controller, CMOS, PQCC32
XR16L2550IM	EXAR	获取价格	LOW VOLTAGE DUART WITH 16-BYTE FIFO
XR16L2550IM-F	ETC	获取价格	IC UART FIFO 16B DUAL 48TQFP
XR16L2551	EXAR	获取价格	LOW VOLTAGE DUART WITH POWERSAVE

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