CDC2582PAH

Overview

The CDC2582PAH is a 3.3-V phase-locked loop clock driver featuring differential LVPECL inputs and twelve TTL-compatible outputs in a 52-pin Quad Flatpack package. It operates at frequencies from 50 MHz to 100 MHz, or down to 25 MHz for half-frequency configurations. The device includes an integrated PLL with no external RC network required, internal 26-ohm series resistors for signal integrity, and distributed VCC/GND pins to reduce switching noise. Outputs are configurable via SEL1 and SEL0 to operate at one-half, same, or double the input frequency.

Feature Summary

• Integrates a phase-locked loop to align output frequency and phase with differential LVPECL inputs without requiring external loop filter components.
• Configurable output banks allow distribution of clock signals at one-half, same, or double the input frequency using select logic inputs.
• Includes internal 26-ohm series resistors on all outputs to dampen transmission-line effects and improve signal integrity.
• Features distributed power and ground pins to minimize switching noise during high-speed operation.

Applications

• Clock-distribution networks for synchronous DRAM systems
• Low-skew clock-generation circuits
• High-performance digital system timing

Procurement Notes

Verify the specific ordering suffix PAH corresponds to the 52-pin Quad Flatpack package configuration. Confirm that the component meets RoHS compliance standards as indicated in the datasheet documentation. Ensure the supply voltage matches the recommended 3.3-V operating range before integration into the design.

Selection Notes

Select this component when a low-jitter, low-skew clock driver is required for 3.3-V systems. It is suitable for applications needing frequency multiplication or division relative to a differential LVPECL source. Consider the stabilization time requirements for the internal PLL when designing the power-up sequence.

Part Context

This device belongs to Texas Instruments' EPIC-IIB BiCMOS family, designed for high performance and reduced power dissipation. It serves as a specialized clock driver solution for systems requiring precise phase alignment between differential inputs and multiple TTL-compatible outputs.

Replacement Considerations

No direct public substitute part numbers are documented in the provided datasheet. Verify compatibility with existing PCB footprints and electrical specifications if considering alternative clock drivers.

FAQ

Does the CDC2582 require external components for the PLL loop filter?

No, the CDC2582 does not require an external RC network; the loop filter is included on-chip to minimize component count and board space.

How is the feedback loop completed for the PLL?

One of the twelve Y outputs must be externally wired to the FBIN pin to provide the feedback signal for frequency and phase lock.

What is the function of the TEST pin?

The TEST pin bypasses the PLL circuitry for factory testing. For normal operation, it should be strapped to GND.