DS21FT44+

Telecom Overview

The DS21FT44+ is a multichip module (MCM) containing three DS21Q44 E1 enhanced quad framer silicon die, providing twelve independent E1 channels. It operates on a single 3.3V CMOS supply with 5V tolerant I/O and features a 300-pin BGA package measuring 27mm x 27mm with a 1.27mm pitch. The device supports IEEE 1149.1 JTAG boundary scan architecture and allows each quad framer to be concatenated into an 8.192MHz backplane data stream. It is pin-compatible with the DS21FF42 for footprint reuse.

Telecom Feature Summary

• Integrates three DS21Q44 dies to deliver twelve independent E1 framing channels within a compact MCM form factor.
• Supports concatenation of quad framers into a single 8.192MHz backplane data stream for high-density applications.
• Includes IEEE 1149.1 JTAG boundary scan architecture for comprehensive test access and verification.
• Maintains pin compatibility with the DS21FF42 to facilitate footprint reuse across T1 and E1 system designs.

Telecom Applications

• DSLAMs
• Multiplexers/Demultiplexers
• Switches
• High-Density Line Cards

Telecom Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm the temperature range. The standard suffix indicates operation from 0°C to +70°C, while the 'N' suffix denotes -40°C to +85°C. Ensure the component matches the required environmental specifications for the target application before procurement.

Telecom Selection Notes

Select the DS21FT44+ when a twelve-channel E1 solution is required in a space-constrained design. This part serves as a direct functional replacement for the DS21FT42 in E1 systems, offering identical pinouts for board layout continuity. Verify that the application utilizes E1 standards rather than T1, as the internal die configuration is optimized for E1 framing.

Telecom Part Context

This component belongs to the Maxim Integrated/Analog Devices family of telecom interface ICs designed for high-density digital signal processing. It represents a multi-chip module implementation of the DS21Q44 quad framer, consolidating multiple silicon dies into a single package to maximize channel density while minimizing PCB real estate.

Telecom Replacement Considerations

The DS21FT44+ is pin-compatible with the DS21FT42. Designers can utilize the same footprint to support E1 applications using this part instead of the T1-based DS21FT42, provided the system logic is configured for E1 signaling protocols.

Telecom FAQ

How many E1 channels does the DS21FT44+ provide?

The DS21FT44+ provides twelve completely independent E1 channels by integrating three DS21Q44 silicon dies within the multichip module.

Is the DS21FT44+ compatible with T1 applications?

No, the DS21FT44+ is specifically designed for E1 applications. For T1 applications requiring the same footprint, the DS21FF42 or DS21FT42 should be used.

What is the operating voltage for the DS21FT44+?

The device operates on a low-power 3.3V CMOS supply with input and outputs that are 5V tolerant.