BCM5238
®
10/100BASE-TX OCTAL-Φ™ TRANSCEIVER
FEATURES
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Single-chip, eight-port Fast Ethernet transceiver
Low-power 1.8V CMOS technology
Serial Media Independent Interface (SMII)
Source Synchronous SMII (SSSMII)
HP Auto-MDIX automatic crossover
Supports 10BASE-T Polarity Correction
Compatible with 2.5V I/O and 3.3V I/O
Fully integrated digital adaptive equalization
Up to 150 meters of error-free operation
Full-duplex support
Interrupt output capability
128-pin PQFP or 256-ball BGA package
Proven Broadcom proprietary all-DSP Digi-
Φ
™ architecture
SUMMARY OF BENEFITS
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Target usage: Fast Ethernet switches.
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Lowest per port power solution available:< 215 milliwatts per
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port.
Smallest footprint per port available.
Measures 14 mm
∞
20 mm for eight ports.
Single-chip device contains eight independent Fast Ethernet
transceivers.
Performs all physical layer interface functions for 100BASE-
TX full-duplex or half-duplex Ethernet on Category 5
unshielded twisted-pair (UTP) cable and 10BASE-T full or
half-duplex Ethernet on Category 3, 4, or 5 UTP cable.
Compliant with IEEE 802.3 standard.
IEEE 1149.1 (JTAG) scan chain support.
Two LED indicator pins per port.
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BCM5421
Gigabit
PHY
BCM5421
Gigabit
PHY
BCM5238
OCTAL-Φ
SMII
Quad
Magnetics
Quad
Magnetics
Quad
Magnetics
BCM5238
OCTAL-Φ
24-Port 10/100BASE-T Ethernet Switch Example
SMII
Quad
Magnetics
Quad
Magnetics
BCM5238
OCTAL-Φ
SMII
Quad
Magnetics
BOARDCOM [ Broadcom Corporation. ]
