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LXT971A Dual-Speed 3.3 V 10/100 Ethernet Transceiver
Product Description
Demand for high-performance network applications requiring lower power is growing rapidly in today’s
marketplace. The LXT971A Dual-Speed 3.3 V 10/100 Ethernet Transceiver with Carrier Class Ethernet Support
(LXT971A Transceiver) is a lowpower, single-port Fast Ethernet transceiver with significantly expanded Cable
Discharge Event (CDE) protection. The LXT971A transceiver includes an MII with extended register capability and
an optional 2.5 V power supply interface for additional power savings. For 100BASE-FX fiber networks, the LXT971A
Transceiver is designed with a pseudo-ECL (PECL) interface for seamless integration with common industry
standard fiber modules. Revolutionary design techniques incorporate our Optimal Signal Processing (OSP)
architecture, an ideal combination of digital signal processing and analog design techniques designed for die size,
power consumption, performance, reliability, and testability.
Innovative Packaging
The LXT971A Transceiver is delivered in a 7 mm × 7 mm plastic ball grid array (PBGA) package. This revolutionary
package helps save board space and is available in the popular industrial temperature range that is ideal for
network applications in extreme thermal environments. For flexibility in very low-power applications, the LXT971A
Transceiver offers a Sleep mode in addition to two Power Down modes. When the LXT971A Transceiver detects an
absence of energy on the twisted pair input, it minimizes power consumption by shutting down the transmitter and
placing the receiver in low-power mode.
Carrier Class Ethernet
Many networking and telecom applications require high-performance Ethernet components capable of operating
under harsh environmental conditions. Our Carrier Class Ethernet products support operation over the entire
extended temperature range while providing features that increase reliability. Each device has an operation lifetime
of at least 10 years with less than 100 failures per billion hours. Our Carrier Class Ethernet product portfolio
includes solutions for the Ethernet physical layer, as well as repeater technologies at a variety of speeds. Our
Carrier Class Ethernet products are ideal for applications where equipment must function reliably in uncontrolled
environmental conditions such as base stations, telecom/network switches, factory floor equipment, and industrial
computers.
LXT971A Transceiver Block Diagram
RESET
ADDR<4:0>
MDIO
MDC
MDINT
MDDIS
Management/
Mode Select
Logic
Clock
Generator
Register Set
REFCLK
TxSLEW<1:0>
TX PCS
TX_EN
TXD<4:0>
TX_ER
TX_CLK
VGC
GND
PWRDWN
Power
Supply
Parallel/Serial
Converter
Manchester
Encoder
10
Scrambler
& Encoder
100
OSP
Pulse
Shaper
TP
Driver
+
–
TP/
Fiber
Out
+
ECL
Driver
COL
Clock
Generator
Collision
Detect
RX PCS
RX_CLK
RDX<4:0>
RXDV
CRS
RX_ER
JTAG
OSP
Slicer
Register
Set
Serial to
Parallel
Converter
Carrier
Sense
Data Valid
Error Detect
Media
Select
+
100
Manchester
Dencoder
Decoder &
Unscrambler
OSP
Slicer
TDI
TDO
TMS
TCK
TRST
100TX
–
+
10
TPFON
–
Auto
Negotiation
LED/CFG<3:1>
TPFOP
100FX
–
+
TP/
Fiber
In
TPFIP
TPFIN
SD/TP
10BT
–
–
2953 Bunker Hill Lane, Suite 300, Santa Clara, CA 95054, Phone: (408) 217-7300 Fax: (408) 217-7350, [email protected]
Copyright © 2014 Inphi Corporation. All rights reserved. Inphi is a registered trademark of Inphi Corporation.
Document Number: 248913 – 5.0
Functional Description
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Features
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Benefits
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Applications
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3.3 V power supply
64-pin, 7 mm x 7 mm PBGA package
-40 ºC to +85 ºC temperature testing
Sleep mode
MII interface
• 2.5 V MII interface option
Optimal Signal Processing
Baseline Wander Correction
Next Page Exchange
PECL interface
Programmable LED drivers
10/100 Mbps full-duplex operation
Boundary scan (JTAG) test port
Helps lower power consumption
Provides small-profile packaging
Enables industrial applications
Helps minimize power consumption
Complies with industry standards
• Additional power savings
Helps improve data recovery and EMI performance
Provides consistent, error-free performance
Enables transfer of additional information during auto-negotiation
Provides 100BASE-FX fiber-optic capability
Enables flexible network monitoring
Allows simultaneous transmit and receive
Enables board-level testing of the LXT971A Transceiver
Network interface cards (NICs)
PCMCIA cards
Cable modems
Set-top boxes
IP phones
LXT971A Product Family
Product Identifier
Package
Temperature Range
LXT971ABC
64-pin PBGA
Commercial (0 oC to +70 oC)
LXT971ABE
64-pin PBGA
Extended (-40 oC to +85 oC)
LXT971ALC
64-pin LQFP
Commercial (0 oC to +70 oC)
LXT971ALE
64-pin LQFP
Extended (-40 oC to +85 oC)
2953 Bunker Hill Lane, Suite 300, Santa Clara, CA 95054, Phone: (408) 217-7300 Fax: (408) 217-7350, [email protected]
Copyright © 2014 Inphi Corporation. All rights reserved. Inphi is a registered trademark of Inphi Corporation.
Document Number: 248913 – 5.0