Datasheet > 微控制器和处理器 > 串行 IO/通信控制器> XR16L2751

XR16L2751

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
52页	583K
描述
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE

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XR16L2751 数据手册

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XR16L2751

2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE

SEPTEMBER 2002

REV. 1.0.0

FEATURES

GENERAL DESCRIPTION

The XR16L2751¹(2751) is a low voltage dual

universal asynchronous receiver and transmitter

(UART) with 5 Volt tolerant inputs. The device

• 2.25 to 5.5 Volt Operation

• 5 Volt Tolerant Inputs

• Functionally Compatible to ST16C2550 and

XR16C2850 with 4 additional inputs

includes

additional capabilities over the

XR16L2750: Intel and Motorola data bus selection

and a “PowerSave” mode to further reduce sleep

current to a minimum during sleep mode. The 2751’s

XR16C2850 but with added functions. It supports the

Exar’s enhanced features of 64 bytes of TX and RX

FIFOs, programmable FIFO trigger level, FIFO level

counters, automatic hardware and software flow

control, automatic RS-485 half duplex direction

control with programmable turn-around delay, 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 UART

channel to support data rates up to 6.25 Mbps.

• Intel or Motorola Data Bus Interface Select

• Two Independent UARTs

■ Up to 6.25 Mbps at 5 Volt, 4 Mbps at 3.3 Volt,

and 3 Mbps at 2.5 Volt with 8X sampling rate

■ 64 bytes of Transmit and Receive FIFOs

■ Transmit and Receive FIFO Level Counters

■ Programmable TX and RX FIFO Trigger Levels

■ Automatic Hardware (RTS/CTS) Flow Control

■ Selectable RTS Flow Control Hysteresis.

■ Automatic Software (Xoff/Xon) Flow Control

■ Automatic RS-485 2-wire Half-duplex Direction

Control to the Transceiver via RTS#

■ Full Modem Interface

■ Infrared Receive and Transmit Encoder/

NOTE: 1 Covered by U.S. Patent #5,649,122 and #5,832,205

decoder

APPLICATIONS

• PowerSave Feature reduces sleep current to 15 µA

at 3.3 Volt

• Portable and Battery Operated Appliances

• Wireless Access Servers

• Device Identification

• Ethernet Network Routers

• Crystal or external clock input

• Cellular Data Devices

• Industrial and Commercial Temperature ranges

• 48 TQFP Package (7 x 7 x 1.0 mm)

• Telecommunication Network Routers

• Factory Automation and Process Controls

FIGURE 1. XR16L2751 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, DTRA#,

IOW# (R/W#)

64 Byte TX FIFO

UART

Regs

DSRA#, RTSA#,

DTSA#, CDA#, RIA#,

OP2A#

CSA# (CS#)

CSB# (A3)

ENDEC

TX & RX

BRG

INTA (IRQ#)

INTB (logic 0)

64 Byte RX FIFO

TXB, RXB, DTRB#,

DSRB#, RTSB#,

CTSB#, CDB#, RIB#,

OP2B#

TXRDYA#

TXRDYB#

RXRDYA#

RXRDYB#

Intel or

Motorola

Data Bus

Interface

UART Channel B

(same as Channel A)

XTAL1

XTAL2

Reset (Reset#)

16/68#

Crystal Osc/Buffer

CLKSEL

HDCNTL#

2751BLK

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

12 3 4 5 6 7...52

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与XR16L2751相关器件

型号	品牌	获取价格	描述	数据表
XR16L2751_05	EXAR	获取价格	2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
XR16L2751CM	EXAR	获取价格	2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
XR16L2751CM-F	EXAR	获取价格	Serial I/O Controller, 2 Channel(s), 0.78125MBps, CMOS, PQFP48, 7 X 7 MM, 1 MM HEIGHT, GRE
XR16L2751CMTR-F	EXAR	获取价格	Serial I/O Controller, 2 Channel(s), 0.78125MBps, CMOS, PQFP48, TQFP-48
XR16L2751IM	EXAR	获取价格	2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
XR16L2751IM-F	EXAR	获取价格	Serial I/O Controller, 2 Channel(s), 0.78125MBps, CMOS, PQFP48, 7 X 7 MM, 1 MM HEIGHT, GRE
XR16L2751IMTR-F	EXAR	获取价格	Serial I/O Controller, CMOS, PQFP48,
XR16L2752	EXAR	获取价格	2.25V TO 5.5V DUART WITH 64-BYTE FIFO
XR16L2752CJ	EXAR	获取价格	2.25V TO 5.5V DUART WITH 64-BYTE FIFO
XR16L2752CJ-F	EXAR	获取价格	Serial I/O Controller, 2 Channel(s), 0.78125MBps, CMOS, PQCC44, GREEN, PLASTIC, LCC-44

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