DS33R11+

Overview

The DS33R11+ is a telecom interface IC designed to extend Ethernet LAN segments over T1, E1, or J1 data streams. It encapsulates MAC frames using HDLC or X.86 (LAPS) protocols for transparent transport. The device features an integrated 10/100 IEEE 802.3 Ethernet MAC supporting MII and RMII interfaces with half/full duplex operation. It includes a built-in T1/E1/J1 framer and Line Interface Unit (LIU). Power requirements are met by dual supplies of 1.8V and 3.3V. The component operates within a temperature range of -40°C to +85°C and is housed in a 256-pin BGA package.

Feature Summary

• Integrates Ethernet MAC with automatic flow control and serial T1/E1/J1 transceiver capabilities
• Supports store-and-forward packet processing with fractional bandwidth allocation via CIR controller
• Provides programmable BERT and external SDRAM buffering for high-speed data handling

Applications

• Transparent LAN Service implementation
• LAN extension over carrier networks
• Ethernet delivery over T1/E1/J1 infrastructure

Procurement Notes

Verify the specific revision status and errata documentation before integration, as multiple revisions may exist. Confirm that the required external components, such as the 16MB SDRAM buffer, are compatible with the specified timing parameters. Ensure the design accommodates the humidity sensitivity level indicated in the datasheet during storage and assembly.

Selection Notes

Select this component when a single-chip solution is required to map Ethernet traffic onto PDH circuits without external framing logic. The integrated LIU reduces board space compared to discrete solutions. Verify that the available pin count in the 256-BGA package fits the target PCB layout constraints and thermal dissipation requirements.

Part Context

This part belongs to the Maxim Integrated Ethernet Mapper family, which specializes in bridging local area networks with wide area network transport layers. The DS33R11 specifically targets applications requiring direct mapping of Ethernet frames into TDM streams, eliminating the need for separate multiplexers or complex protocol conversion hardware.

Replacement Considerations

No public confirmed substitute part numbers are available.