BCM5221 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – 10/100BASE TX SINGLE CHANNEL SIGNI PHY TRANSCEIVER

BCM5221 OVERVIEW
Lowest-Power Fast Ethernet PHY
With a power dissipation of 250 mW, the BCM5221 is the
industry’s lowest-power Fast Ethernet PHY. It features an
integrated voltage regulator, and can be supplied by either a 2.5V
or 3.3V power source. In addition, the BCM5221 has several
intelligent power-down states that conserve power, yet allow
products based on it to automatically turn on when needed.
The BCM5221 includes a unique Intelligent Power-Management
feature that powers down the device if energy is not detected on
the cable. This feature is especially useful for portable and
power-sensitive applications such as laptop LAN card adapters.
The BCM5221 allows PCMCIA or CardBus adapters to remain
plugged in and draw virtually no energy even if the client is no
longer connected to the network. Because most laptop users do
not remove their LAN PC card when working remotely, this
feature results in a noticeably extended battery life for laptop
computer users.
The BCM5221 can be set to periodically wake up at a user-
defined interval, allowing the product to initiate keep-alive
traffic on the network. For lowest power consumption, the
BCM5221 can be put in a power-off state (<2.5 mW).
Network Tolerance
The BCM5221 includes features that simplify the installation
and maintenance of local area networks. One such feature is the
HP Auto-MDIX capability, which automatically detects and
corrects crossed cables. With HP Auto-MDIX, the installer does
not need to know what is on the other end of the network cable:
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the BCM5221 automatically switches its transmit and receive
circuitry to accommodate the link partner’s polarity.
Cable-sourced electrostatic discharge (CESD) is a recently
discovered phenomenon that occurs when an electrically charged
network cable is plugged into a networked product, an issue
becoming more prevalent with recent cable installations. The
BCM5221 has been designed and tested to withstand over 5K V
of CESD, which unlike other transceivers prevents the device
from being destroyed in a CESD event.
DSP-Based PHY Technology
The BCM5221 builds on Broadcom's proven DSP PHY design
and full custom circuit design techniques to create a highly
integrated and robust physical layer solution. DSP techniques
allow the BCM5221 to achieve high interoperability and to
exhibit robust performance across voltage (+/-10%), temperature
(-40 to 85C), and process variations. Broadcom's DSP-based,
Digi-PHY™ technology has been proven in the shipment of over
450,000,000 Fast Ethernet ports. Broadcom's superior quality
has resulted in a failure rate well under 10 PPM.
Applications
Applications for the BCM5221 that take advantage of its low
power and high network tolerance:
• PCMCIA/CardBus Cards
• LAN on Motherboard
• IP Phones
• Cable Modems
• Set-Top Boxes
• Print Servers
• Wireless Access Points
• Embedded Telecom
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5221-PB03-R-04-15-03
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