XR17V254

更新时间： 2024-01-31 11:25:37

品牌	Logo	应用领域
艾科嘉 - EXAR		PC
页数	文件大小	规格书
70页	1571K
描述
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT

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XR17V254 技术参数

生命周期：	Obsolete	零件包装代码：	QFP
包装说明：	LFQFP,	针数：	144
Reach Compliance Code：	unknown	HTS代码：	8542.31.00.01
风险等级：	5.81	地址总线宽度：	32
边界扫描：	NO	最大时钟频率：	33 MHz
通信协议：	ASYNC, BIT	数据编码/解码方法：	NRZ
最大数据传输速率：	1 MBps	外部数据总线宽度：	32
JESD-30 代码：	S-PQFP-G144	长度：	20 mm
低功率模式：	YES	串行 I/O 数：	4
端子数量：	144	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	LFQFP	封装形状：	SQUARE
封装形式：	FLATPACK, LOW PROFILE, FINE PITCH	认证状态：	Not Qualified
座面最大高度：	1.6 mm	最大供电电压：	3.6 V
最小供电电压：	3 V	标称供电电压：	3.3 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子形式：	GULL WING
端子节距：	0.5 mm	端子位置：	QUAD
宽度：	20 mm	uPs/uCs/外围集成电路类型：	SERIAL IO/COMMUNICATION CONTROLLER, SERIAL
Base Number Matches：	1

XR17V254 数据手册

XR17V254

66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT

FEBRUARY 2007

REV. 1.0.0

GENERAL DESCRIPTION

• Instrumentation

• Multi-port RS-232/RS-422/RS-485 Cards

• Point-Of-Sales

The XR17V254 (V254) is a single chip 4-channel

66MHz PCI (Peripheral Component Interconnect)

UART (Universal Asynchronous Receiver and

FEATURES

Transmitter)

solution,

optimized

for

higher

performance and lower power. The V254 device with

its fifth generation register set is designed to meet the

• High performance 32-bit 66MHz PCI UART

• PCI 3.0 compliance

high

bandwidth

and

power

management

requirements for multi-serial communication ports for

system administration and management. The 32-bit

66MHz PCI interface is compliant with PCI 3.0 and

PCI power management revision 1.1 specifications.

The device provides an upgrade path for Exar’s

33MHz 5V and Universal PCI UART family of

products in a 144-pin LQFP package.

• PCI power management rev. 1.1 compliance

• EEPROM interface for PCI configuration

• 3.3V supply with 5V tolerant non-PCI (serial) inputs

• Data read/write burst operation

• Global interrupt register for all four UART channels

• Up to 8 Mbps serial data rate

The V254 consists of four independent UART

channels, each with set of configuration and

enhanced registers, 64 bytes of Transmit (TX) and

Receive (RX) FIFOs, and a fractional Baud Rate

Generator (BRG). A global interrupt source register

provides a complete interrupt status indication for all

4 channels to speed up interrupt parsing. The V254

device operates at 33/66MHz and features fully

programmable TX and RX FIFO level triggers,

automatic hardware and software flow control, and

automatic RS-485 half duplex direction control output

for software and hardware design simplification.

• Eight multi-purpose inputs/outputs

• A 16-bit general purpose timer/counter

• Sleep mode with wake-up Indicator

• Four independent UART channels controlled with

■ 16C550 compatible register Set

■ 64-byte TX and RX FIFOs with level counters

and programmable trigger levels

■ Fractional baud rate generator

■ Automatic RTS/CTS or DTR/DSR hardware

NOTE 1: Covered by U.S. Patents #5,649,122 and #5,949,787

flow control with programmable hysteresis

APPLICATIONS

■ Automatic Xon/Xoff software flow control

• Remote Access Servers

■ RS-485 half duplex direction control output

with selectable turn-around delay

• Storage Network Management

• Factory Automation and Process Control

■ Infrared (IrDA 1.0) data encoder/decoder

FIGURE 1. BLOCK DIAGRAM OF THE XR17V254

(5V Tolerant

Serial Inputs)

3.3V VCC

UART Channel 0

CLK (upto

66MHz)

64 Byte TX FIFO

TX0, RX0, DTR0#,

UART

Regs

DSR0#, RTS0#,

CTS0#, CD0#, RI0#

TX & RX

ENDEC

RST#

BRG

64 Byte RX FIFO

AD[31:0]

C/BE[3:0]#

FRAME#

IRDY#

UART Channel 1

TRDY#

Device

Configuration

Registers

PCI Local

Bus

Interface

DEVSEL#

STOP#

IDSEL

PERR#

SERR#

PAR

UART Channel 2

INTA#

PME#

TX3, RX3, DTR3#,

DSR3#, RTS3#,

CTS3#, CD3#, RI3#

UART Channel 3

Configuration

Space

Registers

Multi-purpose

Inputs/Outputs

MPIO0- MPIO7

16-bit

Timer/Counter

EECK

EEDI

EEDO

EECS

EEPROM

Interface

XTAL1

XTAL2

Crystal Osc/Buffer

TMRCK

GND

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

12 3 4 5 6 7...70

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