product brief
Intel LXT971A
®
Dual-speed 3.3V 10/100 Ethernet Transceiver
With Intel
®
Carrier Class Ethernet Support
Product Description
High-performance network applications that
demand lower power are growing rapidly in
today’s marketplace. Intel, a leading provider of
Ethernet silicon solutions, has enhanced the
commitment to its Ethernet product family with
its latest 10/100 Fast Ethernet transceiver. The
Intel
®
LXT971A is a next-generation low-power,
single-port PHY with significantly expanded
Cable Discharge Event (CDE) protection.
Revolutionary design techniques incorporate
Intel’s 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.
Applications
LXT971A offers a Sleep mode in addition to
two Power Down modes. When the LXT971A
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.
Intel Carrier Class Ethernet
Many networking and telecom applications
require high-performance Ethernet
components capable of operating under harsh
environmental conditions. Intel
®
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. All Intel Carrier Class Ethernet devices
will be available a minimum of 5 years from
product introduction.
The Intel Carrier Class Ethernet product
portfolio includes solutions for Ethernet
physical layer, switching and repeater
technologies at a variety of speeds. Intel
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.
Intel
Internet Exchange
Architecture
®
Low-power, dual-speed network applications
for the LXT971A transceiver include: network
interface cards (NICs), PCMCIA cards, cable
modems, set-top boxes and IP phones.
The LXT971A includes an MII with extended
register capability and an optional 2.5V power
supply interface for additional power savings.
For 100BASE-FX fiber networks, the LXT971A
is designed with a pseudo-ECL (PECL) interface
for seamless integration with common industry-
standard fiber modules.
Innovative Packaging
Intel delivers the LXT971A in a 7mm x 7mm
plastic ball grid array (PBGA) packaging. 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 Block Diagram
RESET
ADDR<4:0>
MDIO
MDC
MDINT
MDDIS
TX_EN
TXD<4:0>
TX_ER
TX_CLK
TX PCS
Parallel/Serial
Converter
Power
Supply
Management/
Mode Select
Logic
Register Set
Clock
Generator
+
–
+
ECL
Driver
–
TDI
TDO
TMS
TCK
TRST
TP/
Fiber
Out
TPFOP
TPFON
VGC
GND
PWRDWN
REFCLK
TxSLEW<1:0>
TP
Driver
Manchester
Encoder
Scrambler
& Encoder
10
100
OSP
Pulse
Shaper
Auto
Negotiation
LED/CFG<3:1>
Register
Set
Collision
Detect
Serial to
Parallel
Converter
Carrier
Sense
Data Valid
Error Detect
Clock
Generator
Media
Select
JTAG
OSP
Slicer
100TX
+
–
+
TP/
Fiber
In
COL
RX_CLK
RDX<4:0>
RXDV
CRS
RX_ER
RX PCS
10
100
Manchester
Dencoder
Decoder &
Unscrambler
TPFIP
TPFIN
SD/TP
OSP
Slicer
100FX
–
+
10BT
–
ETC [ ETC ]
