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Overview:

Broadcom® BCM85821 is the industry's highest performing and lowest power 800GbE PAM-4 PHY transceiver, capable of driving four-channel 226-Gb/s PAM-4 at 113 Gbaud. Both 400GB DR1.2 and 1.6GB DR4.2 are supported.

The BCM85821 utilizes the market-leading 5-nanometer PAM-4 PHY transceiver technology platform, which has been validated by the BCM85812, to provide a pathway to accelerate the availability of 1.6T OSFP-XD optical modules. Advanced Broadcom DSP technology and equalization technology compensate for light damage while maintaining the world's lowest-power pluggable optical modules and co-packaged optical solutions, enabling deployments of 51.2-Tb/s and higher density switched ASics.

The BCM85821 integrates a highly differentiated feature set, including market-leading FEC feature options and client-side switch ASIC SerDes interoperability, providing an unmatched competitive advantage to the market.

In 800GbE mode, the BCM85821 converts the client's eight channels of 106 Gb/s to four channels of 226 Gb/s to drive the next generation of high-density optical PAM-4 links within the OSFP-XD form factor module.

The client of the BCM85821 also features cross bars for easy wiring in the PCB. On-chip clock synthesis is done with a low-cost 312.5 MHz or 625 MHz reference clock via a high-frequency, low-jitter phase-locking loop

Functional characteristics

Single-chip 4 x 200G PAM-4 PHY drives 800GbE through optical fibers

Client: 8 x 106G PAM-4

Line side: 4 × 226G PAM-4 (128,120 interior code with 2-bit fill)

Support forward gear box, backward compatible with 400G optical module

Client: 8 x 53G PAM-4

Line side: 4 x 106G PAM-4

Supports client crossbar system and can be flexibly routed to various standards

Supports 100G repeater mode

Supports FEC monitoring in repeater mode with secondary sampling feature to reduce power consumption

Supports FEC termination and generation

Support differential line end output

Both the line end (10 taps) and the client end (7 taps) support TX FIR

The client interface complies with:

The IEEE 802.3ck C2C (Appendix 135F) specification supports medium-range channels

The IEEE 802.3ck C2M (Appendix 135G) specification supports the chip-to-module channel

The CEI-112G-VSR/MR Specification supports both short range (VSR) and medium range (MR) channels

IEEE 802.3cd compliant KP4 and end-to-end FEC bypass operation: -800g /400G/200G/100G KP4 FECC

The client provides link training support

Loop between the line end and the client

5nm CMOS design with lowest power consumption

Integrated AVS regulator

Applications

• Deploy 1.6T OSFP-XD and 800G OSFP optical modules in hyperscale data centers

• 400G DR1.2

• 1.6TB DR4.2

Please call us if you need:

Contact: Mr. Chen

Tel: +8613410018555

Email: sales@hkmjd.com