CDCV857BIDGG

Clock Generators, PLLs, Frequency Synthesizers Overview

The CDCV857BIDGG is a 2.5-V phase-lock loop clock driver manufactured by Texas Instruments, designed for Double Data-Rate Synchronous DRAM applications and spread spectrum clock compatibility. It operates within a frequency range of 60 MHz to 200 MHz, distributing one differential clock input to ten differential outputs. The device features low cycle-cycle jitter of ±50 ps and low static phase offset of ±50 ps at operating frequencies. It enters a low-power mode when no CLK input signal is applied or PWRDWN is low. The component operates from dual 2.5-V supplies (AVDD and VDDQ) and is available in a 48-pin TSSOP package with an industrial temperature rating of -40°C to 85°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a sigma-delta synthesizer suitable for indirect VCO modulation in 2.5G applications
• Tracks spread spectrum clocking for reduced electromagnetic interference
• Features automatic PLL activation upon detection of a 20-MHz input signal

Clock Generators, PLLs, Frequency Synthesizers Applications

• Double Data-Rate Synchronous DRAM clock distribution
• Spread Spectrum Clock Compatible systems
• Low jitter clock generation for high-speed memory interfaces

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm the package type and temperature grade. Ensure that the AVDD supply voltage requirements are met, as it is derived from VDDQ. Confirm that the design accounts for the required stabilization time following power-up to achieve phase lock before relying on specified timing parameters.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a low-jitter, 1:10 differential clock distribution solution is required for DDR memory systems. Consider the 48-pin TSSOP package constraints and verify that the PCB layout supports the necessary differential termination. Evaluate the need for industrial temperature ratings (-40°C to 85°C) versus commercial options based on the final application environment.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the CDCV857 family of 2.5-V PLL clock drivers. The 'I' suffix denotes the industrial temperature range variant, while 'DGGR' indicates the 48-pin TSSOP package configuration. Other variants include the BGA package option and commercial temperature grades, sharing the same core PLL functionality but differing in environmental specifications and physical footprint.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers include CDCV857BDGG for commercial temperature operation and CDCVF857DGG for similar zero-delay PLL clock driver functionality. Verify pinout compatibility and electrical characteristics before substitution.