PRODUCT
Brief
B C M 52 0 8
BCM5208 10/100BASE-TX QUAD-
TM TRANSCEIVER
The Broadcom
BCM5208 is a Quad-
10/100BASE-
T Transceiver that contains four 10BASE-T/100-
BASE-TX transceivers
10BASE-T/100BASE-TX/FX IEEE 802.3u-compliant
Full-duplex Support in All Modes
IEEE 802.3u-compliant Auto-Negotiation
Media Independent Interface (MII) for Each Port
Shared MII Serial Management Interface
Fully-integrated Digital Adaptive Equalizers
125 MHz Clock Generator and Timing Recovery
Integrated Multimode Transmit Wave Shaping
Integrated Baseline Wander Correction
Carrier Integrity Monitor on Each Port
Port Switching for Multisegment Repeaters
MII Repeater Mode Support in All Modes
LED Status Pins
Loop-back Mode for Diagnostics
IEEE 1149.1 (JTAG) Support
3.3V Power Supply
208-Pin PQFP Package
Fully-integrated TX/FX Quad PHY Transceiver (MII
to TX Magnetics/FX Optics)
Increases system port density
Decreases system cost per port
Simplifies system and board design
Reduces power consumption
On-chip Multimode Transmit Wave Shaping
Eliminates need for external filters
Minimizes EMI
Flexible Ethernet PHY Solution:
10BASE-T, 100BASE-TX or 100BASE-FX full-
duplex
Suited for both Ethernet switch and repeater products
Digital Adaptive Equalization and Clock Recovery
Increases SNR by 3dB over ideal analog equalizers
Robust performance in harsh noise environments and
over sub-standard cable
Immune to on-chip noise and crosstalk
Insensitive to variations in process, temperature
and voltage
24-Port 10/100BASE-T Ethernet Switch Example
B C M 5 2 0 8 F E A T U R E S
S U M M A R Y O F B E N E F I T S
Switching
Engine
MAC
Logic
MP
Memory
Switch Module
MAC
MAC
MAC
MAC
MAC
MAC
MAC
BCM5208
10/100BASE-TX
QUAD-
TM
Transceiver
BCM5208
10/100BASE-TX
QUAD-
TM
Transceiver
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