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KSZ8051MLLI

10Base-T/100Base-TX Physical Layer Transceiver

Micrel 

KSZ8051MLL

10Base-T/100Base-TX

Physical Layer Transceiver

Data Sheet Rev. 1.0

General Description

The KSZ8051MLL is a single-supply 10Base-T/100Base-

TX Ethernet physical layer transceiver for transmission

and reception of data over standard CAT-5 unshielded

twisted pair (UTP) cable.

The KSZ8051MLL is a highly-integrated, compact solution.

It reduces board cost and simplifies board layout by using

on-chip termination resistors for the differential pairs and

by integrating a low-noise regulator to supply the 1.2V

core.

The KSZ8051MLL offers the Media Independent Interface

(MII) for direct connection with MII-compliant Ethernet

MAC processors and switches.

The KSZ8051MLL provides diagnostic features to facilitate

system bring-up and debugging in production testing and

in product deployment. Parametric NAND tree support

enables fault detection between KSZ8051MLL I/Os and

board. Micrel LinkMD® TDR-based cable diagnostics

permit identification of faulty copper cabling. Remote and

local loopback functions provide verification of analog and

digital data paths.

The KSZ8051MLL is available in the 48-pin, lead-free

LQFP package (See Ordering Information).

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• Single-chip 10Base-T/100Base-TX IEEE 802.3

compliant Ethernet Transceiver

• MII Interface support

• Back-to-Back mode support for 100Mbps copper

repeater or media converter

• MDC/MDIO Management Interface for PHY register

configuration

• Programmable interrupt output

• LED outputs for link, activity and speed status indication

• On-chip termination resistors for the differential pairs

• Baseline Wander Correction

• HP Auto MDI/MDI-X for reliable detection and

correction for straight-through and crossover cables

with disable and enable option

• Auto-negotiation to automatically select the highest link

up speed (10/100 Mbps) and duplex (half/full)

• Power-down and power-saving modes

• LinkMD® TDR-based cable diagnostics for identification

of faulty copper cabling

• Parametric NAND Tree support for fault detection

between chip I/Os and board.

• Loopback modes for diagnostics

• Single 3.3V power supply with VDD I/O options for

1.8V, 2.5V, or 3.3V

• Built-in 1.2V regulator for core

• Available in 48-pin (7mm x 7mm) LQFP package

____________________________________________________________________________________________________________

Functional Diagram

LinkMD is a registered trademark of Micrel, Inc.

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

July 2010

M9999-071210-1.0

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