Analog Devices Inc./Maxim Integrated DS33Z41

Overview

DS33Z41 from Maxim Integrated is a quad inverse multiplexing (IMUX) Ethernet mapper IC that bridges 10/100 Ethernet LANs to TDM WAN infrastructure. It integrates a full IEEE 802.3-compliant MAC (MII/RMII), HDLC/X.86 (LAPS) encapsulation engine, CIR controller with 512kbps granularity, 16MB SDRAM interface, and Interleave Bus (IBO) for up to four T1/E1/J1 or DSL links. It enables bonded transparent LAN service over legacy telecom lines.

For engineers reviewing the DS33Z41 datasheet, DS33Z41 pinout, DS33Z41 application, or DS33Z41 equivalent, key selection considerations include its 169-ball CSBGA package, 1.8V core / 3.3V-tolerant I/O, support for ≤7.75ms differential delay across bonded links, JTAG debug capability, and programmable BERT for serial interface validation.

Technical Context

The DS33Z41 implements store-and-forward packet processing with wire-speed transport across up to four interleaved PDH/TDM streams. Its Layer 1 inverse multiplexing architecture supports channel bonding of T1/E1/J1 or DSL links while maintaining frame integrity via HDLC or X.86 (LAPS) encapsulation with configurable FCS and interframe fill.

It features a dual-mode MAC interface (MII and RMII), parallel microprocessor bus (Intel/Motorola modes), and dedicated CIR controller allocating fractional bandwidth in 512kbps increments. The built-in BERT validates serial link integrity, and IEEE 1149.1 JTAG enables boundary-scan testing and configuration.

Key Specifications

Pinout & Package

DS33Z41 is housed in a 169-ball Chip Scale Ball Grid Array (CSBGA), 14mm × 14mm body size, with 0.8mm ball pitch. Pin assignments are defined for MII/RMII, IBO serial interface, microprocessor bus (address/data/control), SDRAM interface, JTAG, and power/ground terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Ethernet-to-TDM mapping applications.

Compared with DS33Z42 and MAX24287, the DS33Z41 uniquely delivers quad-link inverse multiplexing, granular CIR bandwidth control, and external SDRAM buffering-making it the only option among the three for scalable, managed Ethernet-over-TDM deployments requiring >2Mbps aggregate throughput and differential delay resilience.

Availability

DS33Z41 is available at Aetrix Electronics and suitable for bonded transparent LAN service, LAN extension over T1/E1/J1, Ethernet delivery over HDSL2/4, and G.SHDSL-based metro access requiring stable component supply and long-term industrial temperature support.

Supply support for DS33Z41 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 high-performance analog and mixed-signal semiconductor solutions for communications, computing, and industrial systems.

The DS33Z41 belongs to Maxim's Quad IMUX Ethernet Mapper product line, engineered specifically to enable carrier-grade Ethernet extension over legacy TDM infrastructure with deterministic latency, bandwidth agility, and telecom-standard OAM support.

FAQ

What is the primary function of the DS33Z41?

The DS33Z41 is a quad inverse multiplexing Ethernet mapper IC that bridges 10/100 Ethernet LANs to TDM WAN networks such as T1/E1/J1, HDSL2/4, and G.SHDSL. It performs HDLC/X.86 (LAPS) encapsulation, store-and-forward packet buffering using external SDRAM, and fractional bandwidth allocation via its Committed Information Rate controller. The DS33Z41 enables transparent, bonded Ethernet delivery over legacy telecom infrastructure without requiring protocol translation or routing.

Does the DS33Z41 support both MII and RMII Ethernet interfaces?

Yes, the DS33Z41 supports both MII and RMII interfaces for 10/100 Ethernet connectivity. It operates in half- or full-duplex mode with automatic flow control and includes PHY management via MDIO. The DS33Z41 allows system designers to select the appropriate interface based on board layout constraints and PHY device compatibility-MII for traditional 4-bit-wide connections and RMII for reduced pin count and simplified clocking.

What is the role of the Interleave Bus (IBO) in the DS33Z41?

The Interleave Bus (IBO) is the DS33Z41's dedicated 8-bit serial interface for seamless bidirectional connection to T1/E1 framers or transceivers. It carries HDLC/X.86 encapsulated packets across up to four bonded links using byte-interleaved timing. The DS33Z41 uses IBO to distribute payload across multiple TDM channels while maintaining synchronization and supporting up to 7.75ms differential delay-critical for robust operation over heterogeneous copper lines.

Can the DS33Z41 operate with external SDRAM, and what capacity is supported?

Yes, the DS33Z41 requires an external SDRAM for packet buffering and supports up to 16MB of 100MHz SDRAM. This memory is used for store-and-forward operation, enabling wire-speed packet processing even under bursty traffic conditions. The DS33Z41 implements full SDRAM timing control-including row/column addressing, refresh, and bank management-so no external memory controller is needed. The DS33Z41's SDRAM interface is essential for latency-sensitive applications like VoIP and video transport.

How does the Committed Information Rate (CIR) controller in the DS33Z41 work?

The DS33Z41's CIR controller allocates guaranteed bandwidth in precise 512kbps increments across bonded TDM links, up to the full line rate. It enforces traffic shaping at the WAN transmit path by metering outgoing packets against the configured CIR value. This allows service providers to deliver tiered Ethernet SLAs (e.g., 1.5Mbps, 3.0Mbps) on shared infrastructure. The DS33Z41 implements CIR independently per connection, making it suitable for multi-tenant or multi-service deployments where bandwidth isolation is required.