CSPT855PG Clock/Timing IC - Equivalent & Substitute Parts

Part Overview

The CSPT855PG is a Memory DDR Clock Buffer/Driver IC manufactured by Renesas Electronics Corporation, designed for zero-delay buffering and multiplexing applications in DDR memory systems. This 28-TSSOP surface-mount device operates at frequencies up to 220MHz with a 1:4 input-to-output ratio and differential signaling on both input and output.

The CSPT855PG is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. Texas Instruments offers functionally compatible alternatives that maintain electrical and mechanical compatibility while providing active product status and improved compliance certifications.

Substiute Parts

CSPT855PG

Renesas Electronics CorporationIn Stock: 1191CSPT855PG Datasheet

Current PartRFQ

CDCVF855PW

Texas InstrumentsIn Stock: 1291CDCVF855PW Datasheet

MFR RecommendedRFQ

CDCVF855PWR

Texas InstrumentsIn Stock: 2227CDCVF855PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CSPT855PG are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Compatibility Criteria:

• Maximum frequency: 220MHz (matching or exceeding the original specification)
• Supply voltage range: 2.3V ~ 2.7V (identical to main part)
• Differential input and output signaling capability
• Single circuit configuration
• 28-TSSOP package footprint and pinout compatibility

Mechanical Compatibility Criteria:

• Package type: 28-TSSOP (0.173", 4.40mm Width)
• Surface-mount technology
• Identical supplier device package designation

The Texas Instruments CDCVF855PW and CDCVF855PWR meet these substitution criteria. Both parts are PLL Clock Driver ICs with active product status, operate at 220MHz maximum frequency, support 2.3V ~ 2.7V supply voltage, feature differential SSTL-2 input and output signaling, and are packaged in 28-TSSOP. The primary difference between these substitutes is packaging format: CDCVF855PW is supplied in Tube packaging, while CDCVF855PWR is supplied in Tape & Reel format.

Parameter Comparison

Engineering Selection Recommendations

For New Designs and Production Transitions:

The CDCVF855PW and CDCVF855PWR are direct functional replacements for the obsolete CSPT855PG. Both Texas Instruments substitutes provide active product status, ensuring long-term availability and supply chain stability. The substitutes offer extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), providing greater thermal margin for demanding applications.

Compliance Advantages:

Both substitute parts achieve ROHS3 compliance and REACH unaffected status, compared to the RoHS non-compliant CSPT855PG. The improved Moisture Sensitivity Level (MSL 1 with unlimited shelf life) versus the original part's MSL 3 (168 hours) reduces handling and storage constraints during manufacturing.

Packaging Selection:

Choose CDCVF855PW (Tube packaging) for lower-volume applications or prototype builds. Select CDCVF855PWR (Tape & Reel format) for high-volume production runs where automated assembly and tape-based component feeding are standard practice.

Frequently Asked Questions (FAQ)

Q: Are CDCVF855PW and CDCVF855PWR electrically identical?

A: Yes. Both parts are identical PLL Clock Driver ICs with the same electrical specifications, frequency rating, voltage supply range, and differential signaling characteristics. The only difference is packaging format: Tube versus Tape & Reel.

Q: What is the key difference between the input-to-output ratio of the main part and substitutes?

A: The CSPT855PG specifies a 1:4 input-to-output ratio, while the CDCVF855 series specifies a 2:5 ratio. Both ratios are compatible with DDR clock buffering applications and do not prevent functional substitution in standard memory interface designs.

Q: Can I use these substitutes in existing PCB designs without layout modifications?

A: Yes. Both substitute parts use the identical 28-TSSOP package footprint (0.173", 4.40mm Width) and surface-mount technology. PCB layouts designed for the CSPT855PG require no modification for the CDCVF855 series.

Q: What are the compliance implications of switching from CSPT855PG to CDCVF855 series?

A: The substitutes provide ROHS3 compliance and improved MSL rating (1 versus 3), reducing environmental and handling restrictions. Both parts maintain EAR99 export classification and REACH unaffected status.

Q: Which substitute should I specify for high-volume manufacturing?

A: CDCVF855PWR (Tape & Reel format) is optimized for high-volume automated assembly. CDCVF855PW (Tube packaging) is suitable for lower volumes or manual assembly processes.

Q: Are there any temperature operating range considerations?

A: The substitutes support -40°C to 85°C operation, exceeding the original part's 0°C to 70°C range. This provides additional thermal margin for applications operating in extended temperature environments.