DS26303L-120+A3

Telecom Overview

The DS26303L-120+A3 is an eight-channel short-haul line interface unit (LIU) supporting E1, T1, and J1 protocols from a single 3.3V power supply. It features internal software-selectable transmit and receive-side termination, eliminating the need for external components in many configurations. The device includes an on-chip synthesizer that generates clock rates from a single master clock input, alongside two clock output references. It supports independent channel selection, selectable single-rail or dual-rail modes, and AMI or HDB3/B8ZS encoding. The component operates within a commercial temperature range of 0°C to +70°C and is housed in a 144-pin eLQFP package.

Telecom Feature Summary

• Supports eight complete E1, T1, or J1 short-haul line interfaces with independent protocol selection per channel.
• Integrates crystal-less jitter attenuation and an on-chip synthesizer for clock generation from various master clock frequencies.
• Provides hardware mode interface support, JTAG boundary scan compliance, and built-in BERT testers for diagnostics.
• Includes nonintrusive monitoring capabilities compliant with G.772 standards and configurable redundancy enhancements.

Telecom Applications

• T1 Digital Cross-Connects
• ATM and Frame Relay Equipment
• Wireless Base Stations
• E1/T1/J1 Multiplexer and Channel Banks

Telecom Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm lead-free status and RoHS compliance. Confirm the impedance default associated with the model number variant, as this determines the initial E1 line impedance setting. Ensure the required operating temperature range aligns with the commercial grade specifications before finalizing procurement plans.

Telecom Selection Notes

Select this component when designing systems requiring multiple E1, T1, or J1 channels with minimal external passive components. The internal termination options simplify the bill of materials. Verify that the host processor can interface via the supported parallel or serial ports. Consider the thermal characteristics and package size constraints during the layout phase to ensure proper heat dissipation.

Telecom Part Context

This part belongs to the DS26303 family of octal line interface units manufactured by Analog Devices Inc./Maxim Integrated. The 'L' designation indicates the commercial temperature range, while the '120' suffix specifies the default E1 line impedance setting. This family is designed for high-density telecom applications requiring robust signal integrity and comprehensive diagnostic features.

Telecom Replacement Considerations

Consult the official datasheet for any documented errata or alternative part numbers within the same product family. Verify pin compatibility and electrical specifications if considering cross-references from other manufacturers. Ensure that any substitute component supports the same protocol standards and interface requirements.