DS26521L+

Telecom Overview

The DS26521L+ is a single-channel framer and line interface unit (LIU) combination for T1, E1, and J1 applications. It supports both long-haul and short-haul lines with internal software-selectable termination for 100Ω T1/J1 twisted pair and 120Ω E1 twisted pair. The device operates at a data rate of 44.736 Mb/s with a supply voltage range of 3.135 V to 3.465 V. It features an external master clock input adaptable for T1 or E1 usage in host mode, transmit synchronizer, flexible signaling extraction, and alarm detection. The component is housed in a 64-pin LQFP package and functions within a temperature range of -40°C to +85°C.

Telecom Feature Summary

• Complete T1, E1, or J1 Long-Haul/Short-Haul Transceiver combining LIU and Framer
• Internal Software-Selectable Termination for various twisted pair and coaxial applications
• Crystal-Less Jitter Attenuator meeting ETS CTR 12/13, ITU-T G.736, G.742, G.823, and AT&T Pub 62411
• Flexible Signaling Extraction and Insertion Using Either the System Interface or Microprocessor Port

Telecom Applications

• Routers
• Channel Service Units (CSUs)
• Data Service Units (DSUs)
• Muxes
• Switches

Telecom Procurement Notes

Verify the exact ordering suffix against official documentation before procurement. The '+' suffix indicates lead-free/RoHS compliance. Confirm that the specific variant matches the required temperature range and packaging format. Cross-reference part numbers carefully as multiple revisions may be available through different sales channels. Ensure compatibility with existing system interfaces and clock structures.

Telecom Selection Notes

Select this component when a single-channel framer and LIU combination is required for T1, E1, or J1 networks. Consider the internal software-selectable termination options for twisted pair or coaxial line configurations. Evaluate the crystal-less jitter attenuator capabilities if meeting specific ETS or ITU-T standards is necessary. Verify the operating temperature range and package type requirements for the target application environment.

Telecom Part Context

The DS26521L+ belongs to the DS26521 series of telecom interface ICs manufactured by Analog Devices Inc./Maxim Integrated. It serves as a comprehensive solution for network equipment requiring T1/E1/J1 transceiver functionality. The device integrates framing, line interfacing, and jitter attenuation into a single chip, reducing design complexity for routers, switches, and channel banks.

Telecom Replacement Considerations

Consult official cross-reference tools for parametrically similar parts. Verify pinout compatibility and functional equivalence before substitution. Check for any known errata associated with alternative components. Ensure that replacement parts meet the same environmental and regulatory compliance standards.