97U2A845AHLFT

Application Specific Clock/Timing Overview

The Renesas 97U2A845AHLFT is a zero-delay buffer and multiplexer IC designed for DDR2 memory clock distribution. It features a single input to five output configuration with differential signaling on both sides. The device operates within a supply voltage range of 1.7V to 1.9V and supports maximum frequencies up to 410MHz. Packaged in a 28-CABGA (4.0x4.5mm) surface-mount housing, it integrates an internal PLL for jitter attenuation. The component functions as a clock buffer specifically optimized for high-speed memory interfaces, ensuring precise timing alignment between the source and destination clocks.

Application Specific Clock/Timing Feature Summary

• Zero-delay buffering architecture eliminates propagation delay skew between input and output clocks
• Integrates a Phase-Locked Loop (PLL) for input clock jitter attenuation and frequency multiplication
• Supports differential SSTL_18 output standards compatible with DDR2 memory modules
• Converts a single differential input into five differential outputs for multi-drop memory topologies

Application Specific Clock/Timing Applications

• DDR2 SDRAM clock distribution networks
• High-performance server and workstation memory subsystems
• Embedded systems requiring low-skew clock synchronization for memory controllers

Application Specific Clock/Timing Procurement Notes

This component has reached End-of-Life (EOL) status, with the final production date recorded as November 28, 2017. Current availability is limited to existing stock or last-time-buy scenarios through authorized distributors. Verification of authenticity is critical due to the obsolescence status. Buyers should confirm the specific package marking and revision level against original datasheets to ensure compatibility with legacy designs.

Application Specific Clock/Timing Selection Notes

Designers must verify that the system power rail strictly adheres to the 1.7V to 1.9V operating range, as deviation may cause malfunction. The 28-VFBGA package requires careful PCB layout considerations for thermal dissipation and signal integrity at frequencies up to 410MHz. Since this part is obsolete, alternative solutions from the same family or newer generations with similar pinouts and electrical characteristics should be evaluated for new hardware developments.

Application Specific Clock/Timing Part Context

The 97U2A845 belongs to the ICS97U2A845 family of zero-delay buffers manufactured by Renesas Electronics. These devices are engineered to provide precise clocking for synchronous dynamic random-access memory (SDRAM). The 'H' suffix typically denotes the specific package type and temperature range, while 'LFT' indicates lead-free and halogen-free compliance. This series was widely used in mid-2000s to early-2010s computing platforms before transitioning to DDR3/DDR4 technologies.

Application Specific Clock/Timing Replacement Considerations

Due to the EOL status, direct replacements require checking for updated Renesas families such as the 9UH series or equivalent parts from other manufacturers like IDT (Integrated Device Technology) that support DDR2 interfaces. Compatibility checks must include pin-to-pin correspondence, voltage levels, and output drive strength specifications.