Analog Devices Inc./Maxim Integrated DS2153Q-A7+T&R

Overview

DS2153Q-A7+T&R from Maxim Integrated is an E1 single-chip transceiver (SCT) implementing full CEPT PCM-30/ISDN-PRI line interface, clock/data recovery, and framing for 2.048Mbps E1 systems. It integrates on-board 75Ω/120Ω line build-out, 32-bit or 128-bit jitter attenuator, and dual two-frame elastic store buffers. Used in telecom access equipment for E1 line termination and channelized backplane interfacing.

For engineers reviewing the DS2153Q-A7+T&R datasheet, DS2153Q-A7+T&R pinout, DS2153Q-A7+T&R application, or DS2153Q-A7+T&R equivalent, key selection criteria include E1 framer compliance (G.703/G.704/G.706), dual elastic store support for 8.192MHz backplanes, programmable Sa/Si bit handling, and 44-pin PLCC package compatibility with legacy T1/E1 system designs.

Technical Context

The DS2153Q-A7+T&R implements a complete E1 physical layer transceiver with independent transmit and receive paths, each supporting AMI/HDB3 waveform recovery and generation. Its framer detects and generates FAS, CAS, and CRC4 multiframe alignment, while extracting and inserting Si and Sa signaling bits per ITU G.704 and ETSI 300 011.

It features dual two-frame elastic stores synchronized to SYSCLK (1.544/2.048MHz), enabling phase/frequency tolerance between recovered E1 data and asynchronous backplane clocks. The 8-bit multiplexed parallel port supports both Intel and Motorola bus timing via BTS pin configuration.

Key Specifications

Pinout & Package

DS2153Q-A7+T&R is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch and JEDEC MO-048A outline. Thermal pad not present; standard reflow profile applies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2153Q-A7+T&R, DS2155Q offers identical E1 functionality with extended thermal rating, while MAX3089CSE+ serves entirely different physical layer requirements and cannot replace DS2153Q-A7+T&R in E1 line card or access multiplexer designs.

Availability

DS2153Q-A7+T&R is available at Aetrix Electronics and suitable for telecom access multiplexers, E1 line cards, ISDN-PRI gateways, and fractional E1 terminal adapters requiring stable component supply across multi-year production cycles.

Supply support for DS2153Q-A7+T&R 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 high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.

The DS2153Q-A7+T&R belongs to Maxim's legacy telecom transceiver product line, designed specifically for CEPT E1 infrastructure requiring full G.703/G.704/G.706 compliance and robust line interface integration.

FAQ

What is the primary function of the DS2153Q-A7+T&R in an E1 system?

The DS2153Q-A7+T&R serves as a complete E1 single-chip transceiver, performing clock and data recovery from AMI/HDB3 waveforms, E1 framing (FAS/CAS/CRC4), Sa/Si signaling extraction and insertion, jitter attenuation, and line driving for both 75Ω and 120Ω cables. It enables full E1 line termination without external framer or line interface ICs.

Does the DS2153Q-A7+T&R support both FAS and CRC4 multiframe alignment?

Yes, the DS2153Q-A7+T&R supports both FAS and CRC4 multiframe alignment per ITU G.706. Its framer automatically detects and synchronizes to either format, and the RSYNC pin can be configured to output frame or multiframe boundary pulses based on RCR1.6 setting.

How does the elastic store feature in the DS2153Q-A7+T&R improve system interoperability?

The DS2153Q-A7+T&R includes dual two-frame elastic stores that absorb phase and frequency differences between the recovered E1 clock and an asynchronous backplane clock (up to 8.192MHz). This allows seamless integration into systems where line and backplane clocks are not locked, eliminating slip buffer complexity.

Can the DS2153Q-A7+T&R operate with a 1.544MHz system clock?

Yes, the DS2153Q-A7+T&R accepts 1.544MHz or 2.048MHz at the SYSCLK pin when elastic stores are enabled. RCR2.2 (RSCLKM) selects the expected frequency, allowing the device to synchronize correctly to T1 or E1 backplane environments.

What is the role of the BTS pin on the DS2153Q-A7+T&R?

The BTS pin on the DS2153Q-A7+T&R selects bus timing mode: low configures Intel-style timing (RD/WR/CS), high configures Motorola-style timing (DS/RW/CS). This allows direct interfacing with either microcontroller architecture without external glue logic.