Analog Devices Inc./Maxim Integrated DS26102

Overview

DS26102 from Maxim Integrated is a 16-port ATM transmission convergence device that bridges UTOPIA II–based ATM layers to T1/E1 physical-layer TDM interfaces. It performs HEC generation/verification, cell scrambling/descrambling, cell delineation per ITU I.432, and supports fractional T1/E1 with up to 16 ports. It operates across –40°C to +85°C in a 256-pin CSBGA package and targets DSLAM and IMA edge infrastructure.

For engineers reviewing the DS26102 datasheet, DS26102 pinout, DS26102 application, or DS26102 equivalent, key selection criteria include its 16-TDM-port mapping capability, UTOPIA II interface compliance, programmable Tx FIFO depth (2–4 cells), single-bit HEC error correction, and support for gapped-clock and framing-pulse T1/E1 framer modes.

Technical Context

The DS26102 implements dual-path ATM-to-TDM conversion: on transmit, it accepts ATM cells via UTOPIA II, applies HEC insertion (with programmable COSET polynomial), payload scrambling, and maps cells into T1/E1 TDM frames per ATM Forum af-phy-0016.000/af-phy-0064.000. Its receive path performs HEC-based cell delineation, descrambling, and filtering of idle/unassigned/HEC-errored cells.

It integrates an internal PLL for high-frequency clock generation, supports both multiplexed and nonmultiplexed 8-bit microprocessor interfaces (Intel/Motorola), and provides IEEE 1149.1 JTAG boundary scan. The device handles up to eight external status inputs with interrupt reporting and includes a 1-second timer driven by an 8kHz input.

Key Specifications

Pinout & Package

DS26102 uses a 17mm × 17mm, 256-pin CSP Ball Grid Array (CSBGA) package with VDD/VSS power/ground arrays, dedicated signal groups for 16 TDM ports (RCLK/RDATA/RFP/RLCD), dual UTOPIA II interfaces (Tx/Rx), 8-bit microprocessor bus (A0–A7, AD0–AD7, RD/WR/CS/BTS/MUX), JTAG test pins, and auxiliary functions (1SECOUT, 8KHZIN, EXSTAT0–7, RESET).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ATM-to-T1/E1 convergence applications.

Compared with PM5352 and CX82310, the DS26102 uniquely delivers 16-port density, full UTOPIA II compliance, JTAG testability, and fractional T1/E1 configurability-making it the only option for high-port-count, standards-aligned, carrier-deployable ATM convergence.

Availability

DS26102 is available at Aetrix Electronics and suitable for DSLAM backhaul, ATM over T1/E1 access, and IMA edge node applications requiring stable component supply, long-term industrial temperature support (–40°C to +85°C), and RoHS-compliant packaging.

Supply support for DS26102 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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability interface ICs for communications, industrial, and automotive markets.

The DS26102 belongs to Maxim's ATM physical-layer product line, designed specifically for carrier-class TDM-to-ATM convergence in DSLAMs, routers, and IMA systems operating under strict ATM Forum and ITU-T standards.

FAQ

What is the primary function of the DS26102 in an ATM network?

The DS26102 serves as a 16-port transmission convergence device that maps ATM cells to and from T1/E1 TDM frames. It performs critical functions including HEC generation/verification, cell scrambling/descrambling, cell delineation per ITU I.432, and UTOPIA II interface bridging. In real-world deployment, the DS26102 enables DSLAMs and routers to interoperate with legacy T1/E1 infrastructure while maintaining full ATM Forum compliance (af-phy-0016.000/af-phy-0064.000).

Does the DS26102 support fractional T1/E1 rates, and how is this configured?

Yes, the DS26102 supports fractional T1/E1 rates in multiples of 64kbps (DS0/TS) up to 2.048Mbps per port. Configuration is achieved through register settings documented in Table 15-B of the datasheet, which define bit allocations and frame structure for nonstandard rates. This capability allows the DS26102 to handle subrate leased lines and bandwidth-on-demand services without external rate adaptation hardware.

How does the DS26102 handle clocking for T1/E1 interfaces?

The DS26102 supports two T1/E1 clocking modes: framing-pulse (RFP/TFP) and gapped-clock. In gapped-clock mode, RCLK/TCLOCK are disabled during overhead positions, aligning with ITU I.432. The active clock edge (rising/falling) is programmable via the RAES bit. Additionally, the DS26102 integrates a PLL and internal clock generator, eliminating the need for external high-speed clocks and simplifying system timing design.

What types of cell filtering does the DS26102 provide on the receive path?

The DS26102 provides three configurable receive-side cell filters: HEC-errored cell filtering (enables discard of cells with uncorrectable header errors), idle/unassigned cell filtering (removes filler cells used for rate decoupling), and user-definable header-based filtering (programmable on 5-bit VCI/VPI fields). These filters are independently enabled per port and reduce unnecessary traffic load on downstream ATM layers-critical for efficient DS26102 integration in multi-service networks.

Is the DS26102 compatible with standard UTOPIA II implementations, and what addressing options does it offer?

Yes, the DS26102 implements a fully compliant UTOPIA Level 2 interface with 8-bit data, 5-bit address bus (UR_ADDR0–4, UT_ADDR0–4), and dedicated CLAV/2CLAV strobes. Its UTOPIA address range is configurable via registers, allowing flexible allocation across multiple devices on the same bus. This ensures seamless interoperability with industry-standard ATM SARs and controllers-confirming DS26102 compatibility in existing UTOPIA II–based system architectures.