Multirate 40-Gb/s 1:4 Demux with CDR, VGA and Advanced Feature Set

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45G serial-to-SFI-5.2/XLAUI/OTL3.4/STL256.4 demultiplexer (demux) for use in 300-pin 40G modules.
The BCM84145 has an Optical Internetworking Forum (OIF) SFI-5.2/XLAUI/OTL3.4/STL256.4-compliant four-bit wide transmit system data interface with a deskew channel operating from 2.488 Gb/s to 2.788 Gb/s. The BCM84145 has two Clock and Data Recovery (CDR) circuits that recover the clock and data from the received signals, and then demultiplexes and transmits the data on the SFI-5.2/XLAUI/OTL3.4/STL256.4 interface. There is an additional deskew lane for the SFI-5.2/XLAUI/OTL3.4/STL256.4 interface. The CDR and demultiplexer are fully integrated. The data is recovered by the integrated CDR. The recovered data is interleaved to the SFI-5.2/XLAUI/OTL3.4/STL256.4 interface along with a deskew channel copying data sequentially from each data channel. The SFI-5.2/XLAUI/OTL3.4/STL256.4 timing clock is generated from the recovered clock. The extracted data can optionally be fed to a PRBS detector.


  • Data rate support from 39.8 Gb/s to 44.6 Gb/s
  • Equalizer for PMD and ISI compensation
  • Status indicator for CDR lockdetect
  • RX decision threshold adjust
  • Core power supply: 1.0V
  • SFI-5.2/XLAUI/OTL3.4/STL256.4 CML I/O: 1.0V


  • 802.11 Wireless LAN Solutions
  • Smart Devices

Lifecycle Status


Specification Value
Lifecycle Active
Distrib. Inventory No
I/O Controller
Bus Interface
Transfer Rates
External Memory Interfaces
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