Datasheet > 微控制器和处理器 > 串行 IO/通信控制器> XR16L2551

XR16L2551

更新时间： 2024-11-08 22:41:15

品牌	Logo	应用领域
艾科嘉 - EXAR		/
页数	文件大小	规格书
48页	278K
描述
LOW VOLTAGE DUART WITH POWERSAVE

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XR16L2551 数据手册

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XR16L2551

LOW VOLTAGE DUART WITH POWERSAVE

SEPTEMBER 2003

REV. 1.0.0

FEATURES

GENERAGENERAL DESCRIPTION

• 2.25 to 5.5 Volt Operation

• 5 Volt Tolerant Inputs

The XR16L2551 (L2551) is a low voltage dual

universal asynchronous receiver and transmitter

(UART) with 5 Volt tolerant inputs. The device

includes additional capability over the ST16C2550:

Intel and Motorola data bus interface selection,

hardware and software flow control, infrared encoder/

decoder, sleep mode and a PowerSave mode for

battery operation. The L2551’s enhanced register set

is compatible to the ST16C2550 and XR16L2550. It

supports the Exar’s enhanced features of 16 bytes of

TX and RX FIFOs and a complete modem interface.

Onboard registers provide the user with operational

status and data error tags. An internal loopback

capability allows onboard diagnostics. Independent

programmable baud rate generator is provided in

each channel to support data rates up to 3.125 Mbps.

• Intel or Motorola Bus Interface Select (16/68#)

• Pin-to-pin compatible to XR16L2751CM

• Two Independent UARTs

■ Up to 3.125 Mbps at 5V, 2 Mbps at 3.3V, and 1

Mbps at 2.5V with external clock input

■ Up to 1.5 Mbps at 5V, 1.25 Mbps at 3.3V and 1

Mbps at 2.5V with crystal clock input

■ 16 bytes of Transmit and Receive FIFOs

■ Automatic RTS/CTS hardware flow control

■ Automatic Xon/Xoff software flow control

■ Wireless infrared encoder/decoder

■ Receive FIFO trigger levels select

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

APPLICATIONS

• Battery Operated Instruments

• Data Port Adapters

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

with even, odd, forced or no parity

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

• Handheld Appliances

• Radio Frequency Data Modems

• Base Stations

DTR#, RI#, CD#) in the 48-TQFP package

• Sleep Mode with PowerSave feature for battery

operation

• USB Hubs

• Industrial Temperature range

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

• 48-TQFP Package

• Industrial Automation Controls

FIGURE 1. XR16L2551 BLOCK DIAGRAM

2.25 to 5.5 Volt VCC

*5 Volt Tolerant Inputs

PwrSave

GND

A2:A0

D7:D0

UART Channel A

IOR# (VCC)

TXA, RXA,

RTSA#, CTSA#,

( DTR#, DSR#

CD#, RIA#, OP2A# )

IOW# (R/W#)

16 Byte TX FIFO

UART

CSA# (CS#)

CSB# (A3)

Regs

ENDEC

TX & RX

BRG

INTA (IRQ#)

16 Byte RX FIFO

INTB (logic 0)

Intel or

Motorola

Data Bus

Interface

TXB, RXB,

UART Channel B

(same as Channel A)

RTSB#, CTSB#,

( DTRB#, DSRB#

CDB#, RIB#, OP2B# )

TXRDYA#

TXRDYB#

RXRDYA#

RXRDYB#

XTAL1

XTAL2

Crystal Osc/Buffer

Reset (Reset#)

16/68#

2551BLK

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

12 3 4 5 6 7...48

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与XR16L2551相关器件

型号	品牌	获取价格	描述	数据表
XR16L2551_07	EXAR	获取价格	LOW VOLTAGE DUART WITH POWERSAVE
XR16L2551IL	EXAR	获取价格	LOW VOLTAGE DUART WITH POWERSAVE
XR16L2551IM	EXAR	获取价格	LOW VOLTAGE DUART WITH POWERSAVE
XR16L2552	EXAR	获取价格	2.25V TO 5.5V DUART WITH 16-BYTE FIFO
XR16L2552IJ	EXAR	获取价格	2.25V TO 5.5V DUART WITH 16-BYTE FIFO
XR16L2552IJTR-F	EXAR	获取价格	Serial I/O Controller, CMOS, PQCC44
XR16L2552IM	EXAR	获取价格	2.25V TO 5.5V DUART WITH 16-BYTE FIFO
XR16L2552IM-F	EXAR	获取价格	2.25V TO 5.5V DUART WITH 16-BYTE FIFO
XR16L2552IMTR-F	EXAR	获取价格	Serial I/O Controller, CMOS, PQFP48,
XR16L2750	EXAR	获取价格	2.25V TO 5.5V DUART WITH 64-BYTE FIFO

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