Renesas Electronics 91718CMLF Clock Generator IC - Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 91718CMLF is an 8-SOIC clock generator IC with an 80MHz maximum frequency, designed for applications requiring a single clock circuit with PLL and bypass capability. This device operates at 3V to 3.6V supply voltage and is rated for 0°C to 85°C operating temperature range.

The 91718CMLF is classified as obsolete. Locating equivalent or substitute components is necessary for new designs, production continuity, or system upgrades where this part is no longer readily available through standard distribution channels.

Key Parameters

Parameter	Value
Manufacturer	Renesas Electronics Corporation
Part Number	91718CMLF
Category	Clock/Timing
Type	Clock Generator
Frequency - Max	80MHz
Voltage - Supply	3V ~ 3.6V
Number of Circuits	1
PLL	Yes with Bypass
Input	Clock
Output	Clock
Ratio - Input:Output	1:2
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 91718CMLF requires evaluation based on the following critical parameters:

Functional Type: Clock Generator with integrated PLL and bypass capability
Frequency Range: Maximum operating frequency of 80MHz or higher
Supply Voltage Compatibility: Operating voltage range must encompass or overlap with 3V to 3.6V
Number of Circuits: Single circuit configuration
Input/Output Signal Types: Clock input and clock output capability
Package Form Factor: Surface mount technology with compatible pinout and footprint
Compliance Standards: RoHS3 compliance and REACH unaffected status

The Renesas Electronics 5P35021B-000NDGI qualifies as a substitute based on these criteria. While it operates at higher maximum frequency (500MHz) and offers expanded supply voltage options and output signal types, it maintains core compatibility with the 91718CMLF's functional requirements and compliance certifications.

Parameter Comparison

Parameter	91718CMLF (Main Part)	5P35021B-000NDGI (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Category	Clock/Timing	Clock/Timing
Type	Clock Generator	Clock Generator
Frequency - Max	80MHz	500MHz
Voltage - Supply	3V ~ 3.6V	1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V
Number of Circuits	1	1
PLL	Yes with Bypass	Yes with Bypass
Input	Clock	LVCMOS, Crystal
Output	Clock	LP-HCSL, LVCMOS, LVDS, LVPECL
Ratio - Input:Output	1:2	2:3
Differential - Input:Output	No/No	No/Yes
Mounting Type	Surface Mount	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)	20-VFQFN Exposed Pad (3x3)
Operating Temperature	0°C ~ 85°C	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The 5P35021B-000NDGI is an active product from Renesas Electronics Corporation and maintains full RoHS3 compliance and REACH unaffected status, matching the regulatory posture of the obsolete 91718CMLF.

Key considerations for selection:

Product Availability: The 5P35021B-000NDGI is in active production status, ensuring long-term availability and supply chain stability compared to the obsolete 91718CMLF.
Package Transition: The substitute uses a 20-VFQFN package versus the original 8-SOIC package. PCB layout and footprint redesign is required.
Supply Voltage Range: The substitute supports the 3.135V to 3.465V range, which overlaps with the original 3V to 3.6V specification. Designs operating at the extremes of the original range require verification.
Frequency Capability: The 500MHz maximum frequency of the substitute exceeds the 80MHz requirement of the original part, providing operational margin.
Temperature Range: The substitute extends the lower operating temperature limit to -40°C, offering broader environmental coverage.
Compliance: Both parts maintain equivalent regulatory compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the 5P35021B-000NDGI directly replace the 91718CMLF without PCB modifications?

A: No. The 5P35021B-000NDGI uses a 20-VFQFN package with a 3x3mm footprint, while the 91718CMLF uses an 8-SOIC package. PCB layout redesign and footprint changes are mandatory.

Q: Are the supply voltage ranges compatible?

A: Partial compatibility exists. The 5P35021B-000NDGI supports 3.135V to 3.465V, which overlaps the original 3V to 3.6V range. Designs operating at 3V or above 3.465V require circuit evaluation.

Q: What is the impact of the different input/output signal types?

A: The 91718CMLF accepts clock input and provides clock output. The 5P35021B-000NDGI accepts LVCMOS or crystal input and provides LP-HCSL, LVCMOS, LVDS, or LVPECL output. System interface requirements must be evaluated to confirm output signal type compatibility.

Q: Does the higher maximum frequency of the substitute affect system performance?

A: The 500MHz capability of the 5P35021B-000NDGI exceeds the 80MHz requirement. This provides operational margin and does not negatively impact systems designed for lower frequencies, provided the input/output signal types and voltage levels are compatible.

Q: Are there differences in PLL and bypass functionality?

A: Both parts include PLL with bypass capability. Functional equivalence is maintained in this regard.

Q: What is the significance of the different input:output ratios?

A: The 91718CMLF operates at 1:2 ratio, while the 5P35021B-000NDGI operates at 2:3 ratio. Clock multiplication or division requirements must be verified against system specifications.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the 91718CMLF and 5P35021B-000NDGI are RoHS3 compliant and REACH unaffected, maintaining equivalent regulatory status.

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