CDCU877GQLR

Application Specific Clock/Timing Overview

The CDCU877GQLR is a 1.8-V phase-locked loop clock driver designed for DDR2 applications, distributed in a 52-ball MicroStar Junior BGA package (0.65-mm pitch). It distributes one differential clock input to ten differential outputs and one feedback pair. The device operates from 10 MHz to 400 MHz with low static phase offset of ±50 ps and cycle-to-cycle jitter of ±30 ps at frequencies up to 340 MHz. It supports spread spectrum clocking for EMI reduction and features fail-safe inputs. Operating temperature range is -40°C to +85°C.

Application Specific Clock/Timing Feature Summary

• Distributes one differential clock input to ten differential outputs and one feedback pair
• Low static phase offset of ±50 ps and dynamic phase offset of ±15 ps
• Cycle-to-cycle period jitter of ±30 ps (160 MHz to 340 MHz)
• Supports spread spectrum clocking compatible with reduced EMI

Application Specific Clock/Timing Applications

• DDR2 SDRAM memory systems
• PC2-3200/4300 compliant designs

Application Specific Clock/Timing Procurement Notes

Verify the specific ordering suffix GQLT or GQLR against current Texas Instruments documentation to confirm packaging quantity and moisture sensitivity level. Confirm availability status as the base model may be listed as Lifebuy or obsolete depending on the exact suffix configuration.

Application Specific Clock/Timing Selection Notes

Select this component when a 1.8-V supply is required for DDR2 clock distribution. Ensure the PCB layout accommodates the 52-ball MicroStar Junior BGA footprint. Verify that the application frequency falls within the 10 MHz to 400 MHz operating range and that the power supply filtering meets the recommended AVDD specifications.

Application Specific Clock/Timing Part Context

This part belongs to the CDCU877 family of 1.8-V PLL clock drivers. The GQL suffix indicates the 52-ball MicroStar Junior BGA package variant. Other variants include the RHAR (40-pin VQFN) and AZQL (A-grade version). The device is functionally identical across packages regarding electrical performance.

Application Specific Clock/Timing Replacement Considerations

CDCU877AZQLR: A-grade version of the same package. CDCU877RHAR: Pin-compatible alternative in a 40-pin VQFN package.