CDCR83DBQ

Application Specific Clock/Timing Overview

The CDCR83DBQ is a Direct Rambus clock generator designed for 800-MHz data transfer rate memory systems. It provides differential clock outputs with cycle-cycle jitter less than 50 ps at 400 MHz. The device operates from a single 3.3-V supply and supports frequency multipliers of 4, 6, 8, and 16/3. It features three power operating modes to minimize power consumption in mobile applications. The component synchronizes the Rambus channel clock with an external system or processor clock using phase alignment logic.

Application Specific Clock/Timing Feature Summary

• Supports frequency multipliers: 4, 6, 8, 16/3
• Cycle-cycle jitter < 50 ps at 400 MHz
• Spread spectrum clocking tracking capability
• No external components required for PLL

Application Specific Clock/Timing Applications

• Direct Rambus memory subsystems
• Desktop motherboards
• Workstation motherboards
• Server motherboards
• Mobile PC motherboards

Application Specific Clock/Timing Procurement Notes

Verify the marketing status before procurement as the CDCR83DBQ is classified as NRND (Not Recommended for New Designs). Confirm package type DBQ and pin count 24. Check RoHS compliance status if required by specific manufacturing standards.

Application Specific Clock/Timing Selection Notes

Select this component when designing Direct Rambus memory interfaces requiring synchronization between channel and system clocks. Ensure input REFCLK frequencies are between 33 MHz and 100 MHz. Verify that the application requires the specific multiplier ratios supported by the MULT0 and MULT1 terminals.

Application Specific Clock/Timing Part Context

The CDCR83DBQ is part of the CDCR83 series of Direct Rambus clock generators. It is designed to work with TI’s 133-MHz clock synthesizers such as the CDC924 and CDC921. The device is characterized for operation over an industrial temperature range of −40°C to 85°C.

Application Specific Clock/Timing Replacement Considerations

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