DS21Q348

Telecom Overview

The DS21Q348 is a quad Line Interface Unit (LIU) designed for E1, T1, and J1 telecommunications applications. It operates on a single 3.3V power supply with a voltage range of 3.135V to 3.465V. The device integrates four independent channels within a 144-pin CSBGA package measuring 17mm x 17mm. It supports an operating temperature range from -40°C to +85°C. Key electrical parameters include a master clock input of 2.048MHz or 1.544MHz and synthesized backplane clock outputs at 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz.

Telecom Feature Summary

• Complete line interface unit supporting E1, T1, and J1 standards with internal software-selectable receive-side termination for 75Ω, 100Ω, and 120Ω impedances.
• Crystal-less jitter attenuator requiring only a 2.048MHz master clock for both E1 and T1 applications, with optional 1.544MHz support for T1.
• Generates appropriate line build-outs for E1 and DSX-1/CSU T1 applications, including AMI, HDB3, and B8ZS encoding and decoding.
• Integrated diagnostic capabilities including loopbacks, PRBS pattern generation/detection, and in-band loop code handling.

Telecom Applications

• Long-haul and short-haul trunk interfaces
• CEPT 30/ISDN-PRI lines for E1
• DSX-1 and CSU line builds for T1

Telecom Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature range. The 'N' suffix indicates a -40°C to +85°C industrial grade device in a 144-pin CSBGA package. Confirm RoHS compliance status if lead-free requirements are mandatory for the assembly process.

Telecom Selection Notes

Select this component when a quad-channel solution is required for E1/T1/J1 line interfacing. Ensure the system design accommodates the 144-pin CSBGA footprint. Verify that the host controller supports the desired bus interface mode, whether parallel muxed/nonmuxed, serial, or hardware control.

Telecom Part Context

The DS21Q348 belongs to the Maxim Integrated DS21x48 family of telecom interface ICs. It serves as the quad-channel counterpart to the single-channel DS21348. Both devices share identical functional blocks and register maps, allowing for scalable design architectures using the same core technology.

Telecom Replacement Considerations

The DS21Q348N is the industrial temperature version of the commercial DS21Q348. For single-channel replacements, consider the DS21348 series. No direct pin-compatible substitutes are documented in the provided source material.