CDC925DL Equivalent & Substitute Parts

Part Overview

The CDC925DL is a 133-MHz clock synthesizer IC manufactured by Texas Instruments, designed for Intel CPU server applications. This device functions as a spread spectrum clock generator with PLL capability, converting crystal input to CMOS output at a 1:24 input-to-output ratio. The CDC925DL is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	CDC925DL
Manufacturer	Texas Instruments
Category	Clock/Timing - Frequency Synthesizer
Product Status	Obsolete
Package Type	56-BSSOP (0.295", 7.50mm Width)
PLL Capability	Yes
Input Type	Crystal
Output Type	CMOS
Maximum Frequency	133 MHz
Supply Voltage Range	2.375V ~ 3.465V
Operating Temperature	0°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	2 (1 Year)

Substitute Part Grouping Explanation

The CDCE925PW qualifies as a manufacturer-recommended substitute based on the following criteria:

Common Base Product: Both CDC925DL and CDCE925PW share the base product number CDCE925, indicating they are part of the same product family with compatible core architecture.

PLL Functionality: Both devices incorporate PLL (Phase-Locked Loop) technology for clock generation and frequency synthesis.

Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility in equivalent applications.

Manufacturer Consistency: Texas Instruments manufactures both parts, ensuring design continuity and technical support consistency.

Critical Differences Requiring Evaluation: The CDCE925PW operates at higher maximum frequency (230 MHz vs. 133 MHz), uses different packaging (16-TSSOP vs. 56-BSSOP), accepts expanded input types (LVCMOS and Crystal vs. Crystal only), and operates at lower supply voltage (1.7V ~ 1.9V vs. 2.375V ~ 3.465V). These differences necessitate circuit-level compatibility verification before implementation.

Parameter Comparison

Parameter	CDC925DL	CDCE925PW	Compatibility Notes
Manufacturer	Texas Instruments	Texas Instruments	Same manufacturer
Base Product Number	CDC925	CDCE925	Related product family
Category	Clock/Timing	Clock/Timing	Same functional category
Product Status	Obsolete	Active	Substitute is in active production
PLL	Yes	Yes with Bypass	Both support PLL operation
Input Type	Crystal	LVCMOS, Crystal	Substitute accepts broader input options
Output Type	CMOS	LVCMOS	Output standards differ; LVCMOS is subset of CMOS
Number of Circuits	1	1	Single circuit configuration
Maximum Frequency	133 MHz	230 MHz	Substitute supports higher frequency operation
Supply Voltage Range	2.375V ~ 3.465V	1.7V ~ 1.9V	Voltage ranges do not overlap; circuit redesign required
Operating Temperature	0°C ~ 85°C	-40°C ~ 85°C	Substitute supports extended low-temperature operation
Package Type	56-BSSOP	16-TSSOP	Different package footprints; PCB redesign required
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both meet RoHS3 requirements
Moisture Sensitivity Level	2 (1 Year)	1 (Unlimited)	Substitute has superior moisture tolerance

Engineering Selection Recommendations

Substitution Feasibility: The CDCE925PW is the manufacturer-recommended substitute for the obsolete CDC925DL. However, direct pin-for-pin replacement is not possible due to fundamental differences in package type, pin count, and electrical specifications.

Voltage Supply Consideration: The non-overlapping supply voltage ranges (CDC925DL: 2.375V ~ 3.465V; CDCE925PW: 1.7V ~ 1.9V) require complete power distribution circuit redesign. Existing power supply designs for CDC925DL cannot be directly adapted to CDCE925PW without modification.

Package and PCB Impact: The transition from 56-BSSOP to 16-TSSOP represents a significant reduction in pin count and physical footprint. PCB layout redesign is mandatory, including signal routing, decoupling capacitor placement, and thermal management considerations.

Compliance Status: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for applications requiring these certifications.

Active Production Status: The CDCE925PW is in active production with verified programmability, providing long-term availability and technical support advantages over the obsolete CDC925DL.

Frequently Asked Questions (FAQ)

Q: Can CDCE925PW be used as a direct replacement for CDC925DL?

A: No. While both are Texas Instruments clock synthesizers from the same product family, they differ in package type (56-BSSOP vs. 16-TSSOP), pin count, supply voltage range, and maximum frequency. Direct substitution requires circuit redesign including power supply modification and PCB layout changes.

Q: What are the key electrical differences between these parts?

A: The primary differences are supply voltage range (CDC925DL operates at 2.375V ~ 3.465V; CDCE925PW operates at 1.7V ~ 1.9V), maximum frequency (133 MHz vs. 230 MHz), and input flexibility (CDCE925PW accepts both LVCMOS and Crystal inputs versus Crystal only for CDC925DL).

Q: Is the CDCE925PW suitable for Intel CPU server applications?

A: The CDCE925PW is a general-purpose PLL clock generator. Application suitability depends on specific system requirements including frequency synthesis ratios, input/output signal characteristics, and power supply architecture. Detailed application circuit review is required.

Q: What packaging considerations apply to substitution?

A: The CDC925DL uses 56-BSSOP packaging while CDCE925PW uses 16-TSSOP packaging. These are incompatible footprints requiring complete PCB redesign. The CDCE925PW's smaller package may offer space savings but necessitates new layout and routing strategies.

Q: Are both parts RoHS compliant?

A: Yes. Both CDC925DL and CDCE925PW are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for equivalent applications.

Q: What is the moisture sensitivity difference?

A: CDC925DL has MSL 2 (1 Year) while CDCE925PW has MSL 1 (Unlimited). The CDCE925PW offers superior moisture tolerance, reducing handling and storage constraints during manufacturing and assembly processes.

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