DS21FT42N

Telecom Overview

The DS21FT42N is a multichip module (MCM) containing three independent T1 Enhanced Quad Framers, providing a total of 12 channels. It operates on a single 3.3V CMOS supply with 5V tolerant I/O and accepts an input voltage range of 2.97V to 3.63V. The device supports data rates up to 1.544 Mb/s per channel and functions within a commercial temperature range of 0°C to +70°C. It utilizes a 300-pin BGA package measuring 27mm x 27mm with a 1.27mm pitch.

Telecom Feature Summary

• Integrates three independent T1 framers into a compact multichip module.
• Supports concatenation into a single 8.192MHz backplane data stream.
• Includes IEEE 1149.1 JTAG-Boundary Scan Architecture for testing.

Telecom Applications

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

Telecom Procurement Notes

Verify the specific suffix 'N' confirms the extended industrial temperature range (-40°C to +85°C) as listed in ordering information, distinct from the commercial grade variant. Confirm RoHS compliance status directly with the manufacturer documentation before finalizing procurement specifications.

Telecom Selection Notes

Select this component when a high-density solution requiring exactly twelve T1 framing channels is necessary. It serves as a direct footprint-compatible alternative to the sixteen-channel DS21FF42N, allowing design flexibility between T1 and E1 applications without altering the PCB layout.

Telecom Part Context

This device belongs to the DS21Q42 family of T1 Enhanced Quad Framers. The DS21FT42N represents the four-by-three configuration, housing three silicon die within the MCM structure. It shares pin compatibility with the DS21FT44 series, facilitating mixed-protocol system designs.

Telecom Replacement Considerations

The DS21FF42N is a confirmed substitute offering sixteen channels instead of twelve. Both devices share identical physical dimensions and pinouts, ensuring mechanical interchangeability on the same PCB footprint.