Analog Devices Inc./Maxim Integrated DS21354LC1+

Overview

DS21354LC1+ from Maxim Integrated is a 3.3V single-chip E1 transceiver IC designed for CEPT PCM-30/ISDN-PRI line interface applications. It integrates clock/data recovery, jitter attenuation (32-bit or 128-bit selectable), framer with FAS/CAS/CCS/CRC4 support, HDLC controller for Sa-bit or DS0 channels, and dual elastic store buffers. It operates on 0–2 km twisted-pair cables and meets ITU-T G.703/G.704/G.706/G.823 and ETS 300 011/233/166 standards.

For engineers reviewing the DS21354LC1+ datasheet, DS21354LC1+ pinout, DS21354LC1+ application, or DS21354LC1+ equivalent, this device serves as a drop-in upgrade to DS2154/DS2152 with enhanced signaling flexibility, JTAG boundary scan, interleaved PCM bus support, and crystal-less jitter attenuation - critical for telecom access equipment, multiplexers, and TDM gateways requiring stable E1 timing and alarm handling.

Technical Context

The DS21354LC1+ implements a fully independent transmit/receive architecture: its receive-side framer locks to AMI/HDB3 E1 waveforms via transformer-coupled RRING/RTIP inputs, recovers clock/data, and feeds into a configurable jitter attenuator before frame alignment and CAS/Si/Sa bit extraction. Transmit path accepts asynchronous backplane data (up to 8.192MHz), formats CRC4 multiframe overhead, and drives line via programmable waveshaping compliant with G.703 75Ω coax or 120Ω twisted-pair.

It supports hardware-based signaling reinsertion synchronized to backplane multiframe, per-channel code insertion in both paths, and dual elastic stores with independent RSYSCLK/TSYSCLK clocks - enabling seamless interconnection between E1 lines and asynchronous system buses while maintaining ETS 300 233 carrier loss detection and AIS/RAI alarm generation.

Key Specifications

Pinout & Package

DS21354LC1+ is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant and rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2154LN+, DS21354LC1+ delivers superior jitter performance, lower power, and richer signaling features - making it optimal for new designs targeting ETSI compliance and compact line cards. Against SI2154-A-EVB, DS21354LC1+ reduces component count and design risk by integrating all E1 PHY functions in one die.

Availability

DS21354LC1+ is available at Aetrix Electronics and suitable for telecom access multiplexers, E1 line cards, TDM gateways, and remote terminal units requiring stable component supply, long-lifecycle support, and industrial-temperature operation.

Supply support for DS21354LC1+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.

The DS21354LC1+ belongs to Maxim's Single-Chip Transceiver (SCT) product line, engineered specifically for CEPT/E1 infrastructure equipment where integration, jitter control, and standards compliance are critical.

FAQ

What is the operating temperature range for DS21354LC1+?

The DS21354LC1+ is rated for industrial temperature operation from –40°C to +85°C. This range is confirmed in the ordering information table and supported by thermal characterization in the device's AC timing specifications. The L suffix in DS21354LC1+ denotes the industrial-grade variant, ensuring reliable performance in outdoor cabinets, central office environments, and uncontrolled telecom enclosures where ambient temperatures exceed commercial limits. DS21354LC1+ maintains full G.703/G.704 compliance across this entire range.

Does DS21354LC1+ require an external crystal for jitter attenuation?

No, DS21354LC1+ features crystal-less jitter attenuation with selectable 32-bit or 128-bit depth - a key differentiator from earlier SCTs like DS2154. The internal VCO/PLL and 8.192MHz clock synthesizer eliminate the need for external crystal components while meeting ITU-T G.823 jitter transfer and generation requirements. This capability is explicitly documented in Section 15.3 and the "New Features" table on page 6 of the datasheet, reducing BOM cost and board space.

How does DS21354LC1+ handle CAS signaling in E1 applications?

DS21354LC1+ extracts and inserts CAS signaling aligned with CRC-4 multiframe boundaries using dedicated hardware logic. It supports both FAS and CRC4 framing modes and provides direct access to Si and Sa bits via internal registers. The device also offers hardware-based signaling reinsertion synchronized to backplane multiframe clocks - minimizing host CPU overhead. This functionality is detailed in Sections 9 and 13 of the datasheet and validated by register maps for CAS control (e.g., RCR1, TCR1).

Is DS21354LC1+ pin-compatible with DS2154?

Yes, DS21354LC1+ is pin-compatible with DS2154, DS2152, DS21352, and DS21552 as stated in the "Features" section on page 1. All share the same 100-pin LQFP package and identical pin assignments for core functions including RRING/RTIP, TRING/TTIP, D0–D7, and control signals. Firmware written for DS2154 can be reused with minimal register initialization updates - confirmed in Section 1.1 ("superset versions") and Table 3-1 (Pin Description Sorted by Pin Number).

What alarm conditions does DS21354LC1+ detect and report?

DS21354LC1+ detects and reports RLOS (Receive Loss of Signal), RRA (Remote Alarm Indication), RAIS (Remote AIS), and AIS (Alarm Indication Signal) via dedicated status registers and interrupt-capable pins (RCL, RLOS, RRA, RAIS). Alarms trigger on state change - not level - and generate interrupts per ETS 300 011/233 requirements. Detection thresholds and timing criteria are defined in Tables 5-2 and 6-1, and alarm behavior is configurable through registers like ACR and RCR1.