CDCU877AGQLR

Application Specific Clock/Timing Overview

The CDCU877AGQLR is a 1.8-V Phase Lock Loop (PLL) clock driver designed for Double Data Rate (DDR II) applications. It functions as a zero-delay buffer, distributing one differential clock input pair to ten differential output pairs and one feedback pair. The device supports operating frequencies from 10 MHz to 400 MHz with low jitter characteristics, including cycle-to-cycle jitter of ±30 ps and period jitter of ±20 ps. It operates within a supply voltage range of 1.7 V to 1.9 V and an ambient temperature range of -40°C to +85°C. The component is housed in a 52-ball MicroStar Junior BGA package.

Application Specific Clock/Timing Feature Summary

• Distributes one differential clock input to ten differential outputs and one feedback pair
• Supports Spread Spectrum Clocking (SSC) for EMI reduction
• Low jitter performance: ±30 ps cycle-to-cycle, ±20 ps period jitter
• Includes fail-safe inputs and external feedback pins for synchronization

Application Specific Clock/Timing Applications

• DDR II memory systems
• PC2-3200/4300 compliant designs
• High-speed digital circuit clock distribution

Application Specific Clock/Timing Procurement Notes

Verify the specific ordering suffix 'GQL' corresponds to the 52-ball MicroStar Junior BGA package configuration. Confirm that the lead finish matches the datasheet specification for tin-lead (SnPb). Ensure design compatibility with the required AVDD filtering components, specifically the recommended bead and capacitor values, to maintain signal integrity.

Application Specific Clock/Timing Selection Notes

Select this component when a 1:10 differential clock distribution ratio is required for DDR II architectures. Ensure the system power supply can provide the dynamic current consumption of up to 235 mA under load. Verify that the PCB layout accommodates the 0.65-mm pitch MicroStar Junior BGA package dimensions and thermal requirements.

Application Specific Clock/Timing Part Context

This part belongs to the CDCU877A series of 1.8-V PLL clock drivers. The 'GQL' suffix identifies the specific 52-ball MicroStar Junior BGA package variant. Other variants in the family include the RTB package (40-pin MLF) and non-A versions, which may have slight differences in output cross-voltage specifications or lead finishes.

Application Specific Clock/Timing Replacement Considerations

Direct replacements within the same package include CDCU877GQL. For different package options, consider CDCU877AZQL (52-ball BGA) or CDCU877ARTB (40-pin MLF). Note that the 'A' suffix indicates specific electrical parameter tolerances compared to the base model.