DS31408GN2

Overview

The DS31408GN2 is a dual DPLL timing IC designed for frequency conversion and synthesis in telecom applications. It features eight inputs and fourteen outputs, supporting frequencies from 2kHz to 750MHz with differential or CMOS/TTL formats. The device includes two independent DPLLs, seven digital frequency synthesizers, and three low-jitter APLLs generating less than 1ps RMS jitter. It integrates an IEEE 1588 clock for time synchronization. Operating at 1.8V with 3.3V I/O, it is housed in a 256-pin CSBGA package (17x17mm) and functions within a -40°C to +85°C temperature range.

Feature Summary

• Dual high-performance DPLLs with programmable bandwidth (0.5mHz to 400Hz) and hitless switching capabilities
• Three output APLLs providing fractional scaling with less than 1ps RMS output jitter up to 750MHz
• Embedded IEEE 1588 clock engine supporting OC, BC, and TC architectures with 4ns timestamp accuracy
• Eight input clocks and fourteen output clocks in seven groups with per-output 32-bit dividers

Applications

• Telecom line cards and timing cards for WAN equipment including MSPPs, Ethernet switches, routers, DSLAMs, and base stations
• SONET/SDH, Synchronous Ethernet, and OTN port timing synchronization
• Frequency conversion and IEEE 1588 time/frequency applications in diverse equipment types

Procurement Notes

Verify the specific suffix 'N2' against official Microchip documentation, as standard datasheets list 'DS31408GN'. Confirm RoHS compliance status and lead-free designation. Check for any errata associated with the manufacturing revision. Ensure the 256-CSBGA package dimensions match the design requirements.

Selection Notes

Select this component for designs requiring dual independent clock paths with high-resolution holdover and hitless reference switching. The integrated IEEE 1588 support makes it suitable for precise time synchronization networks. Verify that the required output frequencies fall within the 2kHz to 750MHz range and that the 1.8V supply voltage aligns with the system power architecture.

Part Context

The DS31408 belongs to a family of flexible timing ICs used in telecommunications infrastructure. It serves as a central timing function or line card timing solution for Stratum 2/3E/3/4E/4 standards. The device replaces multiple discrete timing components by integrating DPLLs, DFS blocks, and APLLs into a single chip.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.