CDC2509APWR

Overview

The CDC2509APWR is a 3.3-V phase-lock loop (PLL) clock driver manufactured by Texas Instruments in a 24-pin TSSOP package. It operates within a supply voltage range of 3 V to 3.6 V and supports frequencies up to 100 MHz. The device distributes one clock input to nine outputs, organized into two banks: five outputs (1Y0-1Y4) and four outputs (2Y0-2Y3). Each output includes an integrated 25-Ω series-damping resistor. The unit functions across an operating temperature range of 0°C to 70°C.

Feature Summary

• Integrates a PLL to align feedback output frequency and phase with the clock input signal
• Provides separate enable controls for distinct output banks via 1G and 2G inputs
• Includes on-chip series damping resistors to eliminate external RC network requirements
• Features dedicated FBIN and FBOUT pins to complete the internal feedback loop

Applications

• Synchronous DRAM clock distribution
• Point-to-point load driving
• Spread spectrum clock generation

Procurement Notes

Verify the specific revision status of the SCAS603B datasheet before implementation, as the document indicates a July 2001 revision. Confirm that the application environment remains within the specified 0°C to 70°C operating temperature range. Ensure AVCC is properly decoupled and that the stabilization time requirement of 1 ms is accommodated during power-up sequences to achieve valid phase lock.

Selection Notes

Select this component when a low-skew, low-jitter clock distribution solution is required for synchronous memory systems. The integrated damping resistors simplify board layout by removing the need for external components. Consider the 1 ms stabilization time necessary for PLL locking when designing system power sequencing. Verify that the 100 MHz maximum frequency meets the target system timing requirements.

Part Context

This part belongs to the CDC2509 family of 3.3-V PLL clock drivers from Texas Instruments. Variants such as the CDC2509C offer similar functionality but may differ in electrical specifications or qualification standards. The 'A' suffix typically denotes specific performance grades or manufacturing lots within the standard product line.

Replacement Considerations

The CDC2509CPWR is a documented alternative within the same family offering identical 1-to-9 PLL clock driver functionality in a 24-TSSOP package.