EVB8742

LAN874XA Family Small-Footprint, 10/100 PHY Family Featuring Energy Efficient Ethernet and Wake-On-LAN Summary Microchip’s LAN8740A, LAN8741A and LAN8742A are the latest generation of low-power, 10/100 Fast Ethernet PHYs featuring Energy Efficient Ethernet (IEEE 802.3az) and Wake-On-LAN functionality, which provides system sleep modes for improved power savings. The LAN874XA family features deterministic loop back delay, assuring realtime system performance as well as cable diagnostics which reduce network installation costs. All devices are available in both commercial (0º to 70ºC) and industrial (−40º to 85ºC) temperature ranges. The LAN874XA family is well-suited for set-top box, PVR/DVR, industrial and test/measurement instrumentation applications. Additionally, these devices support auto-negotiation, autopolarity correction, HP Auto-MDIX* and are compliant with IEEE 802.3 and 802.3u standards. Microchip also offers its complimentary and confidential LANCheck® online design review services to customers who select our products for their application design-in.** Highlights ■ Single-chip Ethernet PHY ■ Comprehensive flexPWR® technology • Flexible power management architecture • LVCMOS variable I/O voltage range +1.6V to +3.6V • Integrated 1.2V regulator with disable feature ■ Energy Efficient Ethernet (IEEE 802.3az) ■ Cable diagnostics ■ Deterministic latency ■ Uses a low-cost 25 MHz crystal for RMII mode to drive 50 MHz output ■ Wake-On-LAN ■ HP Auto-MDIX support ■ Supports commercial (0° to 70°C) and industrial (−40° to 85°C) temperature ranges ■ 32-pin, 5 × 5 mm and 24-pin, 4 × 4 mm SQFN, RoHS-compliant packages Target Applications ■ ■ ■ ■ ■ ■ ■ ■ ■ Set-top boxes DVRs/PVRs Digital TVs/iPTVs Printers IP and video phones Industrial Embedded/telecom Test/measurement instrumentation Wireless access points Key Features Benefits Energy Efficient Ethernet (IEEE 802.3az) When used with an Energy Efficient Ethernet MAC, LAN8740A and LAN8741A detect when no activity is occurring, signal the MAC to enter a low power mode and enable low latency recovery. Reduces the duty cycle of trasmission by 99% during idle periods. Wake-On-LAN Allows the SoC’s integrated MAC to be powered down while system retains the ability to wake from select activity Power management features Energy detect power-down reduces power usage when the Ethernet cable is unplugged Cable diagnostics Detects and reports cable shorts, opens and measure of cable length for proactive system maintenance Deterministic latency Assures precision timing in industrial applications Single crystal for RMII mode LAN874XA can generate a 50 MHz clock from a 25 MHz crystal, if required, reducing BOM and overall system cost Industrial temperature (−40° to 85°C) range options available Designed to perform in rugged industrial environments *HP Auto-MDIX eliminates the need for special “crossover” cables when connecting LAN devices together. **LANCheck online design review service requires an Microchip e-Services account and is subject to the terms and conditions stated on Microchip’s website. Which LAN874XA Family Member is Right for Your Design? Features LAN8740A LAN8741A LAN8742A MII/RMII MII/RMII RMII Media Cu Cu Cu Energy Efficient Ethernet ü ü – Wake-on-LAN ü – ü Cable Diagnostics ü – ü MAC Interface(s) – – ü with LAN8710A with LAN8710A with LAN8720A 32-pin 5 × 5 mm SQFN 32-pin 5 × 5 mm SQFN 24-pin 4 × 4 mm SQFN RMII REF_CLK_OUT Pin Compatible Package Size LAN874XA Family System Diagram MII*/ RMII SoC w/ 10/100 Ethernet MAC Mode MDI LAN874XA LED Family Crystal or Clock Oscillator Transformer RJ45 *MII mode not supported in LAN8742A LAN874XA Family Block Diagram MODE[0:2] nRST HP Auto-MDIX Mode Control Reset Control Auto-Negotiation 100M TX Logic TXD[0:3] RXP/RXN Transmitter RMIISEL SMI 100M Transmitter Management Control 10M TX Logic 10M Transmitter TXEN MDIX Control XTAL1/CLKIN TXER PLL RXDV RXER RXCLK MRII/MII Logic TXCLK RXD[0:3] 100M RX Logic Wake-on-LAN CRS COL/CRS_DV 10M RX Logic DSP System: Clock Data Recovery Equalizer Energy Efficient Ethernet Receiver Analog-to-Digital Interrupt Generator XTAL2 nINT LED1 LEDs 100M PLL Squelch & Filters MDC MDIO TXP/TXN 10M PLL Central Bias PHY Address Latches LED2 RBIAS PHYAD[0:2] www.microchip.com Visit our web site for additional product information and to locate your local sales office. Microchip Technology Inc. • 2355 W. Chandler Blvd. • Chandler, AZ 85224-6199 Information subject to change. The Microchip name and logo, the Microchip logo, flexPWR and LANCheck are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. All other trademarks mentioned herein are property of their respective companies. © 2013, Microchip Technology Incorporated. All Rights Reserved. Printed in the U.S.A. 7/13 DS00001539A