DS21Q55

Quad T1/E1/J1 Transceiver

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Product Lifecycle Obsolete

The models in this product family are no longer available.

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Evaluation Kits (2)

DK101

View Detailed Evaluation Kit Information

The DK101 is a general-purpose demo kit platform for evaluating Dallas Semiconductor Telecom ICs. The ICs are mounted on daughter cards specifically designed to plug into the DK101's connector. The DK101 provides a microprocessor, flash- and SRAM-based program memory, various oscillators and support logic, and an RS-232 interface to a host PC. As shipped from the factory, the processor runs general-purpose firmware that executes reads and writes to the daughter card on behalf of PC-based demo software. Custom firmware can be downloaded and executed by the processor for advanced applications.

Features & Benefits

Connects PC-Based Demo Software to the Telecom IC(s) Under Evaluation
Provides Point-and-Click Access to All Telecom IC Registers and Features
128kB of Flash Memory, 264kB of SRAM
Demo Software User Interface can be Customized with Simple Text Edits
Allows Download and Execution of Custom Firmware for Advanced Applications
Supports 3.3V and 5V Telecom ICs
On-Board Oscillators: 3.088MHz (2 x DS1), 16.384MHz (8 x E1), and 44.736MHz (DS3)
Four General-Purpose Switches Available for Use with Custom Firmware
Motorola ONCE/BDM Connector for Code Development and Debug

DK2000

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The DK2000 is a powerful, flexible platform for evaluating Dallas Semiconductor Telecom ICs and developing related firmware. The ICs are mounted on daughter cards specifically designed to plug into the DK2000's four connectors. The DK2000 provides a Motorola MPC8260 PowerQUICC II communications processor, L2 cache, DRAM, flash memory, various clocks and support logic, and an RS-232 interface to a host PC. As shipped from the factory, the processor runs general-purpose firmware that executes reads and writes to the daughter cards on behalf of PC-based demo software.

Features & Benefits

Interfaces with Up to Four Daughter Cards Simultaneously
Connects PC-Based Demo Software to the Telecom ICs Under Evaluation
Provides Point-and-Click Access to All Telecom IC Registers and Features
Demo Software User Interface can be Customized with Simple Text Edits
Supports Development of Telecom Firmware Before Target Board Design is Complete
64MB of DRAM, 4MB of Flash Memory
Supports 5V, 3.3V, and 2.5V Telecom ICs
Hardware Support for Daughter Card-to-Daughter Card and Daughter Card-to-Processor TDM Data Streams
Hardware Support for UTOPIA II Interface
Side TIM Connector Provides Access to the PowerPC 60x Bus for High-Performance Applications
Provides Several Connectors for In-System Programming of Board Components

Documentation & Resources

Data Sheets

DS21Q55-DS21Q55N: Quad T1/E1/J1 Transceiver Data Sheet (Rev. 1)
4/23/2004

PDF

1M

Reliability Data

DS21Q55 Reliability Data
1/12/2023

PDF

22K

Application Notes

DS2155 and DS26521 Software Comparison
12/23/2005
DS21458 Quad and DS26528 Octal Transceiver Software Comparison
9/16/2005
DS2155 and DS26401 Software Comparison
6/6/2003
DS2155 Monitor Mode Design
3/13/2003
DS2155 vs. DS21x5y: Software and Hardware Considerations
12/6/2001

Design Notes

T1/E1 Loopback Operation for Maxim T1/E1/J1 Transceivers
11/4/2004
Examples of DS31256 Applications
10/28/2004
Elastic Store Operation
6/28/2004
Power-Fault Protection Layout
6/6/2003
DS21Qx5y BSDL Scan Chain Mapping
6/6/2003
Extended System Information Bus (ESIB) Control Application
3/13/2003
Design Migration from DS21Q55 to DS21Q50 or DS21Q59
12/10/2002
HDLC Configuration of Framers and Transceivers
9/10/2002
J1 Japanese Standards
9/4/2002
NRZ Applications
8/30/2002
DS2152, DS2154, DS21x5Y, and DS2155 Interfacing to the MC68360 (QUICC32)
8/13/2002
DS2155 Internal BERT Programming
8/13/2002
Telecom Application Notes Index
8/10/2001
DS2153 Programming, ETS 300-011 Remote Alarm Generation
5/15/2001
Programming and Controlling the FDL on DS2141A, DS2151
5/11/2001

Technical Articles

Selecting a T1/E1/J1 Single-Chip Transceiver
3/24/2004
DS2155, DS21Q55, DS2156 Programming SLC-96
9/25/2003
Switching Frame Mode In Live T1 Systems\r\n
9/16/2003
Pulse Template Measurement
12/10/2002
Measuring Telecom Systems Against a Pulse Mask Template
12/3/2002
DS31256 and T1/E1 Interface
11/21/2002
T1/E1 and T3/E3 Transformer Selection Guide
10/15/2001
DS21352/552, DS2151, DS2152, DS2141A, DS21Q42 Programming SLC-96
5/31/2001

Tools & Simulations

BSDL Model Files

ZIP

10.10K

ADSP-DS21Q55 BSDL Model

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.