DS21349Q+

Telecom Overview

The DS21349Q+ is a fully integrated Line Interface Unit (LIU) designed for T1 applications over twisted-pair installations. It interfaces to two twisted-pair lines, one pair for transmit and one for receive. The device supports both long-haul and short-haul configurations with five line build-out settings and four CSU filters. It features a crystal-less jitter attenuator programmable for the transmit or receive path. Operating at a supply voltage of 3.135V to 3.465V, it functions within a temperature range of 0°C to +70°C. The component is housed in a 28-pin PLCC package.

Telecom Feature Summary

• Fully integrated LIU supporting long-haul and short-haul T1 applications
• Crystal-less jitter attenuator configurable for transmit or receive paths
• Programmable B8ZS encoder/decoder with QRSS generator/detector capabilities
• Supports local, remote, analog, and network loopback modes

Telecom Applications

• Routers
• Data Service Units (DSUs)
• Channel Service Units (CSUs)
• Muxes
• T1/E1 Test Equipment

Telecom Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated by the plus suffix. Check for specific revision errata documentation relevant to the manufacturing date code before integration into final designs.

Telecom Selection Notes

Select this part for standard T1 interface requirements requiring integrated line driving and receiving capabilities. Ensure system design accommodates the 28-pin PLCC footprint. Verify that the operating temperature range meets environmental specifications. Consider software control mode availability if hardware pin configuration flexibility is required.

Telecom Part Context

This component belongs to the DS21349 family of telecom interface ICs manufactured by Analog Devices Inc./Maxim Integrated. It serves as a complete solution for T1 line interfacing, replacing discrete components typically used for line drivers, receivers, and jitter attenuation in telecommunications equipment.

Telecom Replacement Considerations

The datasheet notes pin compatibility with the LevelOne LXT362. Verify electrical parameters and register maps against any potential substitute parts to ensure functional equivalence in existing circuit designs.