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 real-
time 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, auto-
polarity 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 fl exPWR® technology
• Flexible power management architecture
• LVCMOS variable I/O voltage range +1.6V to +3.6V
• Integrated 1.2V regulator with disable feature
■Energy Effi cient 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 Benefi ts
Energy Effi cient
Ethernet
(IEEE 802.3az)
When used with an Energy Effi cient
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.
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
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
www.microchip.com
Which LAN874XA Family Member is Right for Your Design?
Features LAN8740A LAN8741A LAN8742A
MAC Interface(s) MII/RMII MII/RMII RMII
Media Cu Cu Cu
Energy Efficient Ethernet ü ü –
Wake-on-LAN ü–ü
Cable Diagnostics ü–ü
RMII REF_CLK_OUT – – ü
Pin Compatible with LAN8710A with LAN8710A with LAN8720A
Package Size 32-pin 5 × 5 mm SQFN 32-pin 5 × 5 mm SQFN 24-pin 4 × 4 mm SQFN
LAN874XA Family System Diagram
LAN874XA Family Block Diagram
RJ45
MII*/
RMII
*MII mode not supported in LAN8742A
Transformer
SoC w/ 10/100
Ethernet MAC RJ45
Crystal or
Clock Oscillator
LAN874XA
Family
MDI
LEDMode
100M Transmitter
10M Transmitter
Transmitter
Receiver
100M TX Logic
100M RX Logic
Mode Control
MDIX Control
Central Bias
PLL
Interrupt
Generator
PHY Address
Latches
LEDs
HP Auto-MDIX
Reset Control
Auto-Negotiation
Management Control
MRII/MII Logic
Wake-on-LAN
10M RX Logic
100M PLL
10M TX Logic
SMI
MODE[0:2]
nRST
RMIISEL
TXD[0:3]
TXEN
TXER
TXCLK
RXD[0:3]
RXDV
RXER
RXCLK
CRS
COL/CRS_DV
MDC
MDIO
DSP System:
Clock
Data Recovery
Equalizer
Energy Efficient Ethernet
Analog-to-Digital
Squelch & Filters
TXP/TXN
RXP/RXN
XTAL1/CLKI
N
XTAL2
nINT
LED1
LED2
RBIAS
PHYAD[0:2]
10M PLL
