OVERVIEW
®
Phone: 949-926-5000
Fax: 949-926-5203
E-mail: info@broadcom.com
Web: www.broadcom.com
BROADCOM CORPORATION
5300 California Avenue
Irvine, California 92617
© 2008 by BROADCOM CORPORATION. All rights reserved.
5221-PB06-R 04/11/08
Broadcom
®
, the pulse logo, Connecting everything
®
, the Connecting everything logo, Signi-PHY™,
and Digi- ™ are among the trademarks of Broadcom Corporation and/or its affiliates in the United
States, certain other countries and/or the EU. Any other trademarks or trade names mentioned are the
property of their respective owners.
Φ
BCM5221 Block Diagram
The BCM5221: Lowest-Power Fast Ethernet PHY
With a power dissipation of 175 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: the BCM5221 automatically
switches its transmit and receive circuitry to accommodate the link
partner’s polarity.
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 5 KV 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°C to 85°C), and process variations.
Broadcom's DSP-based, Digi- ™ technology has been proven in the
shipment of over two billion 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:
SD
• Servers - Network Controller - Sideband
Interface (NC-SI) using RMII interface
• Cable modems
• Digital TV • Set-Top boxes
• PCMCIA/CardBus cards • Print servers
• LAN on motherboard (LOM) • Wireless Access Points
(WAP)
• IP phones • Embedded telecom
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