Datasheet > KSZ8721

KSZ8721

更新时间： 2023-12-06 19:52:26

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
33页	275K
描述
Operating at 2.5 volts to meet low voltage and low power requirements, the KSZ8721 is a 10BaseT/10

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KSZ8721 数据手册

KS8721CL

Micrel, Inc.

KS8721CL

3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver

Rev. 1.2

Features

General Description

• Single chip 100BASE-TX/100BASE-FX/10BASE-T

physical layer solution

TheKS8721CLisa10BASE-T,100BASE-TX,and100BASE-

FXphysicallayertransceiverprovidingMII/RMIIinterfacesto

MACsandswitches. Usingauniquemixed-signaldesignthat

extends signaling distance while reducing power consump-

tion, the KS8721CL represents Micrel’s fourth generation

single-port Fast Ethernet PHY.

• 2.5V CMOS design; 2.5/3.3V tolerance on I/O

• 3.3V single power supply with built-in voltage regulator;

Power consumption <340mW (including output driver

current)

• Fully compliant to IEEE 802.3u standard

• Supports MII and Reduced MII (RMII)

• Supports 10BASE-T, 100BASE-TX, and 100BASE-FX

with far-end-fault (FEF) detection

TheKS8721CLcontains10BASE-Tphysicalmediumattach-

ment (PMA), physical medium dependent (PMD), and physi-

cal coding sub-layer (PCS) functions. It also has on-chip

10BASE-T output filtering. This eliminates the need for

external filters and allows a single set of line magnetics to be

used to meet requirements for both 100BASE-TX and

10BASE-T.

• Supports power-down and power-saving modes

• Configurable through MII serial management ports or via

external control pins

• Supports auto-negotiation and manual selection for

10/100Mbps speed and full-/half-duplex modes

• On-chip, built-in, analog front-end filtering for both

100BASE-TX and 10BASE-T

The KS8721CL automatically configures itself for 100Mbps

or10Mbpsandfull-orhalf-duplexoperation,usinganon-chip

auto-negotiation algorithm. It is the ideal physical layer

transceiver for 100BASE-TX/10BASE-T applications.

• Available in Lead-free and Industrial Temperature

packages.

Functional Diagram

4B/5B Encoder

NRZ/NRZI

Scrambler

TXD3

TXD2

TXD1

TXD0

TXER

MLT3 Encoder

10/100

Pulse

TX+

TX-

Parallel/Serial

Transmitter

Shaper

Parallel/Serial

Manchester Encoder

TXC

TXEN

CRS

COL

MII/RMII

Registers

and

Adaptive EQ

Base Line

4B/5B Decoder

Descrambler

Serial/Parallel

RX+

RX-

Clock

MDIO

MDC

Wander Correction

MLT3 Decoder

NRZI/NRZ

Controller

Interface

Recovery

RXD3

RXD2

RXD1

RXD0

RXER

RXDV

RXC

Auto

Negotiation

10BaseT

Receiver

Manchester Decoder

Serial/Parallel

Power

Down or

Saving

LINK

ACTIVITY

FDX

SPD

LED

Driver

PLL

PWRDWN

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

April 2005

M9999-041405

12 3 4 5 6 7...33

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