Product Brief
Key Features
• Single-chip 1× 50G PHY drives
50GbE over optics:
− System side: 1× 50G PAM-4 or
2× 25G NRZ
− Line side: 1× 50G PAM-4
− Repeater and gearbox applications (no FEC termination)
− Loopbacks (system side and line side)
• Client-side interface is compliant to the CEI-28G/56G MR specification supporting medium reach (MR) channels
• Supports various reach/media types:
− MMF
− SMF
• Low-power 16-nm CMOS design
BCM81118
16-nm 50GbE PAM-4 PHY
(1:1) or (2:1)
Description
The Broadcom® BCM81118 is a single-chip, low-power, low-latency
PAM-4 PHY integrating retimer and equalizer functions supporting 50GbE applications. In 50GbE mode, the BCM81118 retimes and equalizes a 1× 50G
PAM-4 or 2× 25G NRZ host-side signal lanes into a 1× 50G PAM-4 lineside signal to drive optical PAM-4 links inside next-generation modules, including SFP56. On-chip clock synthesis is performed by a low-cost
156.25 MHz reference clock via high-frequency, low-jitter phase-locked loops (PLLs). The BCM81118 is fabricated in advanced low-power, 16-nm
CMOS technology and is available in a RoHS-compliant package.
Applications
• 50GbE optical 1× 50G PAM-4 links for MMF/SMF
• 50GbE SFP56 module form-factors
Figure 1: BCM81118 Block Diagram
Optical Module
2× 25G
NRZ or
1× 50G
PAM-4
BCM81118 1×50G
PAM-4
Optics
PAM-4 PHY
Ordering Information
16-nm 50GbE PAM-4 PHY (1:1) or (2:1) BCM81118A0KRFBG
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81118-PB100 03.01.17
