KSZ8081RNACA 查看數據表（PDF） - Micrel

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KSZ8081RNACA

10Base-T/100Base-TX PHY with RMII Support

Micrel 

KSZ8081RNA/KSZ8081RND

10Base-T/100Base-TX PHY

with RMII Support

Revision 1.1

General Description

The KSZ8081RNA 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 KSZ8081RNA is a highly-integrated PHY 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, and

by offering 1.8/2.5/3.3V digital I/O interface support.

The KSZ8081RNA offers the Reduced Media Independent

Interface (RMII) for direct connection to RMII-compliant

MACs in Ethernet processors and switches.

As the power-up default, the KSZ8081RNA uses a 25MHz

crystal to generate all required clocks, including the

50MHz RMII reference clock output for the MAC. The

KSZ8081RND is the version that takes in the 50MHz RMII

reference clock as the power-up default.

To facilitate system bring-up and debugging in production

testing and in product deployment, parametric NAND tree

support enables fault detection between KSZ8081RNA

I/Os and the board. Micrel’s LinkMD® TDR-based cable

diagnostics identify faulty copper cabling.

The KSZ8081RNA and KSZ8081RND are available in 24-

pin, lead-free QFN packages (see “Ordering Information”).

Data sheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

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

compliant Ethernet transceiver

• RMII v1.2 Interface support with a 50MHz reference

clock output to MAC, and an option to input a 50MHz

reference clock

• RMII back-to-back mode support for a 100Mbps copper

repeater

• MDC/MDIO management interface for PHY register

configuration

• Programmable interrupt output

• LED outputs for link and activity status indication

• On-chip termination resistors for the differential pairs

• Baseline wander correction

• HP Auto MDI/MDI-X to reliably detect and correct

straight-through and crossover cable connections with

disable and enable option

• Auto-negotiation to automatically select the highest link-

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

• Power-down and power-saving modes

• LinkMD TDR-based cable diagnostics to identify faulty

copper cabling

• Parametric NAND Tree support for fault detection

between chip I/Os and the board

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

February 6, 2014

Revision 1.1

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