Analog Devices Inc./Maxim Integrated DS33W11+

Overview

DS33W11+ from Maxim Integrated is a single-port Ethernet-over-PDH mapping device with integrated voice port, supporting 10/100Mbps Ethernet (MII/RMII) and synchronous TDM serial interfaces up to 52Mbps over T1/E1/J1. It performs GFP-F/HDLC/cHDLC/X.86 encapsulation, VLAN/Q-in-Q bridging, and OAM frame handling for eLINE/eLAN services. Used in integrated voice-and-data access gateways.

For engineers reviewing the DS33W11+ datasheet, DS33W11+ pinout, DS33W11+ application, or DS33W11+ equivalent, this page delivers verified technical context, real-world interface roles, QoS implementation details, and validated alternatives for EoPDH edge deployment.

Technical Context

The DS33W11+ implements a store-and-forward Ethernet bridge with wire-speed classification, priority queuing, and CIR/CBS policing. Its dual-domain architecture separates LAN-side MAC processing (MII/RMII) from WAN-side TDM framing (T1/E1), with dedicated GFP-F/LAPS/HDLC decapsulators and encapsulators.

It integrates a voice port compliant with ITU-T G.703/G.704 for direct connection to external codecs, alongside parallel and SPI microprocessor interfaces, DDR SDRAM controller (for external 256Mb 125MHz DDR), and IEEE 1149.1 JTAG for boundary-scan testability.

Key Specifications

Pinout & Package

DS33W11+ is housed in a 256-ball, 17mm × 17mm CSBGA package (package code: 56-G6017-001), RoHS-compliant and rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Ethernet-over-PDH mapping applications.

Compared with DS33X11+, DS33W11+ adds G.703 voice interface capability without sacrificing Ethernet or TDM performance; compared with DS33W41+, it reduces port count and simplifies layout while preserving full feature parity per active port.

Availability

DS33W11+ is available at Aetrix Electronics and suitable for bonded LAN extension, integrated voice-and-data access gateways, and eLINE service edge nodes requiring stable component supply across industrial temperature ranges.

Supply support for DS33W11+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and digital ICs for industrial, communications, and computing applications.

The DS33W11+ belongs to the DS33X/W family of Ethernet-over-PDH mappers, engineered specifically for carrier-class TDM-to-Ethernet transport in access network edge devices.

FAQ

What is the primary function of the DS33W11+ in an Ethernet-over-PDH system?

The DS33W11+ serves as a single-port Ethernet-to-T1/E1 mapper that encapsulates IEEE 802.3 frames into GFP-F, HDLC, cHDLC, or X.86 payloads for transmission over PDH networks. It performs wire-speed bridging, VLAN/Q-in-Q forwarding, and integrates a G.703 voice port - making DS33W11+ ideal for converged voice-and-data access gateways where space and component count are constrained.

Does the DS33W11+ support both MII and RMII Ethernet interfaces?

Yes, the DS33W11+ supports both MII and RMII modes for its 10/100Mbps Ethernet MAC interface. Configuration is done via strap pins and registers, allowing flexible PHY selection. In MII mode, DS33W11+ uses four-bit data paths and separate TX/RX clocks; in RMII mode, it operates with a 50MHz reference clock and two-bit data paths - reducing pin count and PCB complexity without sacrificing throughput.

How does the DS33W11+ handle voice integration, and what standards does it comply with?

The DS33W11+ includes a dedicated G.703/G.704-compliant voice port supporting framed and unframed PCM, enabling direct connection to external codecs. It complies with ITU-T G.703 (physical layer) and G.704 (framing structure), and supports common T1/E1 line coding (AMI, B8ZS, HDB3). This makes DS33W11+ suitable for integrated access devices delivering simultaneous VoIP and Ethernet services over legacy TDM infrastructure.

What external memory is required for the DS33W11+, and why is it necessary?

The DS33W11+ requires an external 256Mb DDR SDRAM operating at 125MHz. This memory serves as the frame buffer for store-and-forward operation, traffic shaping (CIR/CBS policing), delay compensation (up to 200ms differential delay), and OAM frame storage. Without this external DDR, DS33W11+ cannot perform its core QoS, buffering, or timing compensation functions - the chip's internal memory is insufficient for full wire-speed operation.

Can the DS33W11+ be used in systems requiring IEEE 1149.1 JTAG boundary-scan testing?

Yes, the DS33W11+ includes full IEEE 1149.1 JTAG support with TAP controller, IDCODE register, and boundary-scan register implementation. This enables in-circuit testing of solder joints and interconnects during manufacturing, and supports debug access to internal registers. JTAG functionality is fully documented in the DS33W11+ datasheet sections 13 and 14, and requires no additional configuration beyond standard JTAG signal routing (TCK, TMS, TDI, TDO, TRST#).