DS31400GN2

Overview

The DS31400GN2 is a dual digital phase-locked loop (DPLL) timing integrated circuit designed for frequency conversion and synthesis. It features eight input clocks and fourteen output clocks, supporting frequencies from 2kHz to 750MHz. The device includes two independent DPLLs, seven digital frequency synthesizers, and three high-speed low-jitter analog PLLs (APLLs). Operating on a single 1.8V supply with 3.3V I/O, it provides sub-picosecond RMS output jitter via the APLLs. Packaged in a 256-pin CSBGA (17mm x 17mm), it supports CMOS, TTL, CML, LVDS, and LVPECL interfaces.

Feature Summary

• Dual DPLL architecture with hitless switching and programmable bandwidth (0.5mHz to 400Hz)
• Three APLLs delivering less than 1ps RMS output jitter at frequencies up to 750MHz
• Eight differential or CMOS/TTL inputs with continuous quality monitoring and fractional scaling
• Fourteen outputs in seven groups with per-output 32-bit dividers and phase adjustment

Applications

• Telecom line cards and timing cards for WAN equipment including MSPPs, routers, and base stations
• SONET/SDH, Synchronous Ethernet, and OTN port timing synchronization
• Central timing functions meeting Stratum 2, 3E, 3, 4E, and 4 standards

Procurement Notes

Verify the component designation against official manufacturer documentation to confirm pinout compatibility and electrical specifications. Ensure that the ordering suffix corresponds to the required lead-free and RoHS compliance status as defined in the manufacturer's current product change notifications. Cross-reference the package dimensions with the PCB footprint library prior to procurement.

Selection Notes

Select this component when designing systems requiring dual independent clock paths with high-resolution holdover capabilities. The device is suitable for applications demanding simultaneous generation of multiple unrelated frequencies with sub-picosecond jitter. Verify that the system requires support for specific telecom standards such as G.812, G.813, or G.8262 to utilize its built-in compliance features effectively.

Part Context

The DS31400 belongs to a family of high-performance timing ICs intended for telecommunications infrastructure. It serves as a central timing function or line card timing solution. The GN2 suffix indicates a specific package variant within the broader DS31400 series, housed in a 256-pin CSBGA format suitable for surface mount assembly.

Replacement Considerations

Consult the manufacturer's official substitution guide for verified alternative part numbers. Ensure any replacement maintains compatibility with the 256-CSBGA package and supports the required 1.8V core voltage with 3.3V tolerant I/O levels.