Analog Devices Inc./Maxim Integrated DS33ZH11

Overview

DS33ZH11 from Maxim Integrated is a 10/100 Ethernet-to-TDM mapper IC that encapsulates IEEE 802.3 MAC frames into HDLC or X.86 (LAPS) for transport over synchronous PDH/TDM links up to 52Mbps. It supports MII/RMII Ethernet interfaces, hardware/SPI-only operation mode, and features a CIR controller with 512kbps fractional bandwidth allocation. Used in LAN extension over T1/E1/J1, OC-1, or G.SHDSL infrastructure.

For engineers reviewing the DS33ZH11 datasheet, DS33ZH11 pinout, DS33ZH11 application, or DS33ZH11 equivalent, key selection considerations include its 100-ball CSBGA package, hardware-mode-only configuration, 1.8V core / 3.3V-tolerant I/O, JTAG debug support, and dedicated serial interface timing for TDM interconnects.

Technical Context

The DS33ZH11 implements store-and-forward packet processing with full wire-speed throughput across its 10/100 Ethernet MAC and synchronous 52Mbps TDM serial port. Its HDLC/X.86 mapper operates with programmable FCS and interframe fill, and the CIR controller enforces bandwidth limits in precise 512kbps increments on the WAN transmit path.

It supports dual-clock domains: independent transmit/receive timing on the serial interface and configurable Ethernet clocking (MII/RMII), with hardware-mode initialization via dedicated pins (MODEC, HWMODE). JTAG compliance (IEEE 1149.1) enables boundary-scan testing and register-level diagnostics without host processor involvement.

Key Specifications

Pinout & Package

DS33ZH11 is housed in a 10mm × 10mm, 100-ball Chip-Scale Ball Grid Array (CSBGA) package, optimized for high-density PCB layouts and thermal performance in telecom line cards. Pinout is defined exclusively for Hardware Mode or SPI Mode operation - no microprocessor interface pins are active.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS33Z11, DS33ZH11 trades host interface flexibility for smaller footprint and simplified boot; compared with ICS8430I, it delivers 25× higher WAN throughput and standards-compliant LAPS framing essential for carrier interop.

Availability

DS33ZH11 is available at Aetrix Electronics and suitable for transparent LAN extension, Ethernet-over-T1/E1 service delivery, and G.SHDSL backhaul applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for DS33ZH11 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 high-reliability communication ICs for industrial, telecom, and computing markets.

The DS33ZH11 belongs to Maxim's Ethernet Mapper product line, engineered specifically for carrier-class LAN extension over legacy TDM infrastructure - emphasizing deterministic timing, hardware configurability, and standards-compliant framing (HDLC/X.86).

FAQ

What is the primary function of the DS33ZH11?

The DS33ZH11 is a dedicated Ethernet-to-TDM mapper IC that converts IEEE 802.3 MAC frames into HDLC or X.86 (LAPS) format for transmission over synchronous PDH/TDM networks. It performs store-and-forward packet processing at wire speed up to 52Mbps and supports hardware-only or SPI-based configuration - making the DS33ZH11 ideal for fixed-function telecom edge applications where microprocessor overhead must be eliminated.

Does the DS33ZH11 support both MII and RMII Ethernet interfaces?

Yes, the DS33ZH11 supports both MII and RMII interfaces for 10/100 Ethernet connectivity. The choice between them is configured at power-up via MODEC pins. RMII reduces pin count and simplifies layout, while MII provides greater timing margin and compatibility with legacy PHYs - both operate at full wire speed without packet loss. This dual-interface capability ensures the DS33ZH11 can integrate seamlessly into diverse Ethernet PHY ecosystems.

Can the DS33ZH11 operate without an external microprocessor?

Yes, the DS33ZH11 is explicitly designed for hardware-mode-only operation. When HWMODE is asserted, the microprocessor interface is disabled, and configuration is determined by strapping pins (MODEC[1:0]) and optional SPI EEPROM. This eliminates firmware development, boot-time dependencies, and runtime host intervention - a key differentiator from the pin-compatible DS33Z11, which requires host control for full functionality.

What is the role of the Committed Information Rate (CIR) controller in the DS33ZH11?

The CIR controller in the DS33ZH11 enforces guaranteed bandwidth allocation on the WAN transmit path in precise 512kbps increments, up to the full line rate. It shapes traffic to meet SLA requirements for business Ethernet services - ensuring minimum throughput for critical flows while preventing oversubscription. Unlike software-based policing, this hardware CIR block operates deterministically with zero latency impact on the DS33ZH11's store-and-forward pipeline.

Is JTAG debugging supported on the DS33ZH11?

Yes, the DS33ZH11 includes full IEEE 1149.1 JTAG support for boundary-scan testing, register access, and in-circuit diagnostics. JTAG operates independently of the hardware/SPI mode configuration, enabling production test, failure analysis, and low-level register inspection without requiring functional Ethernet or TDM links - a critical capability for validating DS33ZH11 integration in high-reliability telecom systems.