Renesas Electronics 84321AYILF Frequency Synthesizer IC - Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 84321AYILF is a Frequency Synthesizer IC designed for clock and timing applications, capable of generating frequencies up to 260MHz with LVPECL output. This component features an integrated Phase-Locked Loop (PLL) with bypass capability and accepts crystal input signals. The device is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

84321AYILF

Renesas Electronics CorporationIn Stock: 93784321AYILF Datasheet

Current PartRFQ

8T49N241-998NLGI

Renesas Electronics CorporationIn Stock: 35878T49N241-998NLGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 84321AYILF is determined by the following critical parameters:

Functional Requirements:

• PLL with Bypass capability
• Crystal input support
• LVPECL output capability
• Single circuit configuration
• Operating temperature range: -40°C to 85°C

Electrical Compatibility:

• Supply voltage overlap: 3.135V ~ 3.465V (main part) must intersect with substitute supply range
• Maximum frequency capability must meet or exceed 260MHz requirement
• Differential output support (LVPECL)

Physical Compatibility:

• Surface mount technology
• Package footprint compatibility with 32-LQFP or equivalent pinout

The substitute part 8T49N241-998NLGI meets these criteria through expanded input/output flexibility, higher frequency capability (1GHz), overlapping supply voltage range (2.375V ~ 3.465V), and maintained operating temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

The 8T49N241-998NLGI serves as a direct functional substitute for the obsolete 84321AYILF based on the following engineering criteria:

Product Status Advantage: The substitute part maintains active product status with Renesas Electronics, ensuring continued availability, technical support, and manufacturing consistency. The main part's obsolete classification necessitates alternative sourcing.

Compliance and Certifications: Both parts maintain REACH Unaffected status and identical Moisture Sensitivity Level (MSL 3, 168 Hours) specifications. The substitute part adds ROHS3 Compliance certification, meeting modern regulatory requirements.

Functional Compatibility: The substitute part's PLL with Bypass configuration, crystal input support, and LVPECL output capability directly satisfy the functional requirements of the original design. The expanded input/output options (LVCMOS, LVDS, LVHSTL, HCSL) provide additional design flexibility without compromising core functionality.

Electrical Parameters: Operating temperature range remains identical (-40°C to 85°C). Supply voltage range overlap (3.135V ~ 3.465V) ensures compatibility with existing power distribution designs. The substitute's higher maximum frequency (1GHz versus 260MHz) provides performance headroom for current and future applications.

Physical Integration: Package change from 32-LQFP to 40-VFQFN Exposed Pad requires PCB layout modification. The increased pin count (40 versus 32) and different footprint necessitate design review and board redesign.

Frequently Asked Questions (FAQ)

Q: Can the 8T49N241-998NLGI directly replace the 84321AYILF without PCB modifications?

A: No. The substitute part uses a 40-VFQFN Exposed Pad package versus the original 32-LQFP package. PCB layout, trace routing, and component placement require redesign. Pin assignments must be verified against both datasheets before implementation.

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

A: The substitute part supports a wider range of input signal types (LVCMOS, LVDS, LVHSTL, LVPECL, Crystal) compared to the original's crystal-only input. Output options expand to include HCSL, LVCMOS, LVDS, and LVPECL. Maximum frequency capability increases from 260MHz to 1GHz. Supply voltage range extends to 2.375V minimum, providing lower voltage operation capability.

Q: Are the operating temperature ranges identical?

A: Yes. Both parts operate across -40°C to 85°C, maintaining thermal compatibility with the original design specifications.

Q: What is the significance of the Input:Output ratio difference (1:2 versus 3:4)?

A: The ratio indicates the frequency multiplication/division relationship between input and output signals. The substitute part's 3:4 ratio differs from the original's 1:2 ratio, requiring frequency calculation verification for specific applications. Consult device datasheets for programmable ratio options.

Q: Does the substitute part meet modern compliance standards?

A: Yes. The 8T49N241-998NLGI carries ROHS3 Compliance certification and maintains REACH Unaffected status, meeting current regulatory requirements. The original part's compliance status for ROHS is not specified in available documentation.

Q: What is the Moisture Sensitivity Level (MSL) for both parts?

A: Both parts are rated MSL 3 with a 168-hour floor life specification. Identical moisture handling and storage requirements apply to both components.

Q: Is the substitute part available in production quantities?

A: Yes. The 8T49N241-998NLGI maintains active product status with 3570 pieces in new original stock, ensuring reliable supply for production and development applications.