Analog Devices Inc./Maxim Integrated DS2153QX

Overview

DS2153Q from Maxim Integrated is an E1 single-chip transceiver (SCT) implementing full CEPT PCM-30/ISDN-PRI line interface functionality with on-board clock/data recovery, 32-bit or 128-bit jitter attenuation, and dual elastic store slip buffers. It supports 2.048MHz E1 framing in FAS/CAS/CRC4 formats and drives both 75Ω and 120Ω lines via transformer-coupled analog outputs. Used in telecom access equipment for E1 line termination and channelized data transport.

For engineers reviewing the DS2153Q datasheet, DS2153Q pinout, DS2153Q application, or DS2153Q equivalent, key selection criteria include E1 framer compliance (ITU G.703/G.704/G.823), dual elastic store operation up to 8.192MHz backplane clocks, programmable Sa/Si bit handling, and 44-pin PLCC package compatibility with legacy T1/E1 system designs.

Technical Context

The DS2153Q integrates independent transmit and receive paths with separate clock domains: RCLK (2.048MHz recovered), TCLK (2.048MHz primary), and SYSCLK (1.544MHz or 2.048MHz for elastic store synchronization). Its framer performs frame/multiframe alignment detection per ITU G.706 and supports CAS signaling extraction/insertion with full Si/Sa bit access.

Jitter attenuation is configurable as either 32-bit or 128-bit, placed in either transmit or receive data path, meeting ITU G.823 jitter tolerance and generation requirements. The device implements three hardware loopbacks-local, remote, and framer-and provides dedicated counters for BPV, CRC4 errors, FAS errors, and E-bits for real-time line health monitoring.

Key Specifications

Pinout & Package

DS2153Q is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with gull-wing leads, designed for surface-mount assembly and thermal performance in telecom line cards. Pin 1 is located at the index corner adjacent to the notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar E1 transceiver applications.

Compared with DS2153Q, DS2151Q omits E1-specific circuitry (CRC4 framer, CAS extraction, 75Ω drive), making it unsuitable for CEPT deployments; SI2155-D-FM adds dual-mode flexibility but shifts timing control to external PLL management and lacks DS2153Q's dedicated elastic store architecture for high-jitter environments.

Availability

DS2153Q is available at Aetrix Electronics and suitable for telecom access equipment, E1 multiplexers, ISDN-PRI gateways, and industrial RTUs requiring stable component supply across extended product lifecycles.

Supply support for DS2153Q 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 power management ICs for communications, industrial, and computing markets.

The DS2153Q belongs to Maxim's legacy telecom transceiver product line, engineered specifically for CEPT E1 line interface applications in carrier-grade access and aggregation equipment.

FAQ

What is the primary function of the DS2153Q in an E1 system?

The DS2153Q serves as a complete E1 single-chip transceiver, performing clock/data recovery from AMI/HDB3 waveforms, E1 framing (FAS/CAS/CRC4), jitter attenuation, elastic store buffering, and analog line driving. It replaces discrete framer, jitter cleaner, and line interface components in CEPT-compliant telecom equipment, enabling compact, low-power E1 line termination with full ITU G.703/G.704 compliance.

Does the DS2153Q support both 75Ω and 120Ω E1 line impedances?

Yes, the DS2153Q generates line build-outs (LBO) for both 75Ω coaxial and 120Ω twisted-pair E1 lines. Configuration is done via the Line Interface Control Register (LICR), allowing dynamic selection to match physical layer requirements without external components. This dual-impedance capability ensures interoperability across European and legacy telecom installations.

How does the elastic store feature in the DS2153Q improve system timing robustness?

The DS2153Q incorporates dual two-frame elastic store slip buffers that absorb phase and frequency differences between the recovered E1 clock and an asynchronous backplane clock (up to 8.192MHz). This prevents data loss during clock domain crossings, eliminates the need for external FIFOs, and maintains bit integrity in multiplexer and gateway applications where multiple E1 sources feed a common switch fabric.

Can the DS2153Q handle CAS signaling for ISDN-PRI applications?

Yes, the DS2153Q fully extracts and inserts Channel Associated Signaling (CAS) in time slot 16 per ITU I.431 and ETSI TBR-12. It supports both FAS and CRC4 multiframe structures, detects AIS and remote alarms, and provides direct access to Si and Sa bits-enabling native ISDN-PRI (30B+D) implementation without external signaling processors or FPGA-based CAS logic.

What package type and temperature range does the DS2153Q use?

The DS2153Q is offered in a 44-pin PLCC package. The base DS2153Q variant operates from 0°C to +70°C, while the DS2153QN version extends the range to -40°C to +85°C for industrial and outdoor telecom deployments. Both variants are RoHS-compliant and pin-compatible, allowing drop-in replacement in existing designs with thermal derating considerations.