Dual 100GbE CAUI4-to-CAUI4 PHY/Octal 25G Retimer

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The BCM82381 is a low-power, low-latency PHY integrating retimer and equalizer functions that support 100-Gigabit Ethernet (GbE), 40GbE and 10GbE applications.
In 100G mode, the BCM82381 supports two full-duplex 100G ports (CAUI4-to-CAUI4) for SR4, LR4, and copper CR4 CFP2/CFP4/QSFP2 line-card applications. In 40G mode, the BCM82381 supports two full-duplex 40GbE ports (XLPPI-to-XLAUI) for SR4, LR4, and copper CR4 QSFP+ line-card applications. In 10G mode, the BCM82381 supports eight full-duplex 10GbE ports (SFI-to-XFI) for SR, LR, and copper CR SFP+ line-card applications.
On-chip clock synthesis is performed by a low-cost 156.25 MHz reference clock (for all IEEE Standard 10G/40G/100G rates) via high-frequency, low jitter phase-locked loops (PLLs). Individual clock recovery is performed on the device by synchronizing directly to the respective incoming data streams.
The BCM82381 was designed in 28 nm CMOS technology to provide a low-power, low-latency solution with integrated AC coupling capacitors for direct interfacing to Broadcom’s switch products. The BCM82381 is available in a 19mm x 19mm, 324-pin BGA, RoHS-compliant package.


  • Dual 100GE PHY supports CR4/SR4/LR4
  • Clause 92 100G-CR4 Transmit Training
  • Clause 91 100G FEC, Bypass-able
  • Clause 85 40G-CR4 Transmit Training
  • Low-speed CFP2/CFP4/QSFP2/QSFP+ Data I/O
  • Low Power 28nm CMOS design
  • High performance Receive Equalization >35dB channel loss
  • 19x19mm BGA package, 1mm ball pitch


  • Blade Servers
  • Enterprise LAN Switching
  • Line Cards
  • Routers
  • Servers
  • Switches
  • Top-of-Rack Switches

Lifecycle Status


Specification Value
Lifecycle Active
Distrib. Inventory No
SerDes / GPHY
I/O Bandwidth (Gbps)
Bandwidth UOM
Package 33x33 mm
PHY Type 100GE
I/O Controller
Bus Interface
Transfer Rates
External Memory Interfaces 8-bit and 16-bit Flash, w/ 6 Chip Selects SRAM, NVSRAM
ASIC 57304
Link-Speeds 50/40/25/10Gb
Ports 2
TruFlow™ Yes
TruManage™ Yes
Smart Congestion Control No
RoCEv2 No
Multi-Host No
Smart NICs No
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