Renesas 673M-01LF Phase Lock Loop IC - Equivalent & Substitute Parts

Part Overview

The Renesas 673M-01LF is a Phase Lock Loop (PLL) integrated circuit designed for clock/timing applications. This device operates at a maximum frequency of 120MHz with a 1:2 input-to-output ratio and is packaged in a 16-SOIC surface mount configuration. The product is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations where legacy compatibility is required.

Substiute Parts

673M-01LF

Renesas Electronics CorporationIn Stock: 922673M-01LF Datasheet

Current PartRFQ

CD74ACT297M

Texas InstrumentsIn Stock: 991CD74ACT297M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the Renesas 673M-01LF is determined by the following critical parameters:

• Package Compatibility: Both the main part and substitute must use the 16-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB layout and assembly compatibility.
• Functional Type: Both must be Phase Lock Loop (PLL) integrated circuits with clock input and clock output.
• Number of Circuits: Single circuit configuration required.
• Electrical Interface: No differential input/output requirement for both devices.
• Supply Voltage Range: The substitute must operate within or encompass the supply voltage requirements of the application.
• Operating Temperature Range: The substitute must support the required operating temperature window.

The Texas Instruments CD74ACT297M meets the package and functional requirements as a 16-SOIC Phase Lock Loop device. However, differences in frequency capability, input-to-output ratio, and supply voltage range must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The Texas Instruments CD74ACT297M is an active product offering improved long-term availability compared to the obsolete Renesas 673M-01LF. Both devices share identical package specifications (16-SOIC surface mount) and functional classification as single-circuit Phase Lock Loop ICs with non-differential input/output.

Key considerations for substitution:

• Frequency Capability: The CD74ACT297M operates at a maximum of 55MHz, which is lower than the 673M-01LF specification of 120MHz. This substitution is suitable only for applications operating below 55MHz.
• Input-to-Output Ratio: The CD74ACT297M provides a 1:1 ratio versus the 673M-01LF 1:2 ratio. Applications requiring frequency multiplication by a factor of 2 cannot use this substitute without circuit redesign.
• Supply Voltage Range: The CD74ACT297M requires 4.5V to 5.5V, which is narrower than the 673M-01LF range of 3.135V to 5.5V. Applications operating below 4.5V cannot use this substitute.
• Operating Temperature: The CD74ACT297M supports -55°C to 125°C, exceeding the 673M-01LF range of 0°C to 70°C, providing broader environmental capability.
• Compliance Status: The CD74ACT297M is RoHS3 compliant, whereas the 673M-01LF compliance status is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT297M directly replace the Renesas 673M-01LF in existing designs?

A: Direct replacement is possible only if the application operates at frequencies below 55MHz, requires a 1:1 input-to-output ratio (or can be redesigned to accommodate this), and operates within the 4.5V to 5.5V supply voltage range. The identical 16-SOIC package ensures physical compatibility on the PCB.

Q: What is the significance of the 1:2 versus 1:1 input-to-output ratio difference?

A: The 673M-01LF multiplies the input clock frequency by 2, while the CD74ACT297M provides a 1:1 output. Applications requiring frequency doubling cannot use the CD74ACT297M without implementing external frequency multiplication circuitry.

Q: Why is the 673M-01LF classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and support. The CD74ACT297M, as an active product from a major manufacturer, provides assured long-term availability and supply chain stability.

Q: Are there any package or mounting differences between these devices?

A: No. Both devices use the 16-SOIC (0.154", 3.90mm Width) surface mount package, ensuring identical PCB footprint and assembly compatibility.

Q: What compliance certifications should be verified for new designs?

A: The CD74ACT297M carries RoHS3 compliance certification. For applications requiring specific regulatory compliance (REACH, ECCN, or HTSUS classifications), both devices share identical REACH Unaffected and EAR99 ECCN status.