KSZ8091RNAIA datasheet(4/62 Pages) MICROCHIP

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KSZ8091RNA/RND

DS00002298A-page 4

 2016 Microchip Technology Inc.

1.0

INTRODUCTION

1.1

General Description

The KSZ8091RNA 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 KSZ8091RNA 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 a flexible 1.8/2.5/3.3V digital I/O interface.

The KSZ8091RNA offers the Reduced Media Independent Interface (RMII) for direct connection with RMII-compliant

Ethernet MAC processors and switches.

As the power-up default, the KSZ8091RNA uses a 25 MHz crystal to generate all required clocks, including the 50 MHz

RMII reference clock output for the MAC. The KSZ8091RND takes in the 50 MHz RMII reference clock as the power-

up default.

Energy Efficient Ethernet (EEE) provides further power saving during idle traffic periods and Wake-On-LAN (WOL) pro-

vides a mechanism for the KSZ8091RNA to wake up a system that is in standby power mode.

The KSZ8091RNA and KSZ8091RND are available in 24-pin, lead-free QFN packages.

FIGURE 1-1:

SYSTEM BLOCK DIAGRAM

KSZ8091RNA/RND

RJ-45

CONNECTOR

MEDIA TYPES:

10BASE-T

100BASE-TX

RMII

MDC/MDIO

MANAGEMENT

25MHz

XTAL

22pF

10/100Mbps

RMII MAC

50MHz

REF_CLK

PME_N

(SYSTEM

POWER

CIRCUIT)

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