Renesas 8523CGLF Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The Renesas 8523CGLF is a Clock Fanout Buffer (Distribution) Multiplexer IC with a 2:4 input-to-output ratio, designed for high-speed clock distribution applications up to 650 MHz. This device features differential input and output support with multiple input signal format compatibility (CML, HCSL, HSTL, LVDS, LVHSTL, LVPECL, SSTL) and HSTL output configuration.

The 8523CGLF is classified as obsolete. Identifying suitable substitute parts is necessary to maintain design continuity, ensure component availability, and support long-term production requirements for systems currently utilizing this clock buffer.

Substiute Parts

8523CGLF

Renesas Electronics CorporationIn Stock: 9218523CGLF Datasheet

Current PartRFQ

8SLVP1204ANLGI

Renesas Electronics CorporationIn Stock: 38998SLVP1204ANLGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 8523CGLF is determined by the following critical parameters that must be maintained or exceeded:

Core Functional Requirements:

• Input-to-output ratio of 2:4
• Differential input and output capability
• Support for multiple input signal formats (minimum: CML, LVDS, LVPECL)
• Surface mount packaging suitable for PCB integration

Performance Specifications:

• Maximum frequency capability at or above 650 MHz
• Supply voltage range compatibility or overlap with 3.135V ~ 3.465V
• Operating temperature range that encompasses or extends the original 0°C ~ 70°C specification

Physical & Environmental Compliance:

• Surface mount package type
• Moisture sensitivity level (MSL) rating of 3 or better
• REACH and RoHS compliance status

The substitute part 8SLVP1204ANLGI meets these criteria with enhanced performance characteristics, including higher frequency capability (2 GHz), extended operating temperature range (-40°C ~ 85°C), and active product status ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 8523CGLF is classified as obsolete, making long-term component availability uncertain. The 8SLVP1204ANLGI maintains active product status with Renesas Electronics Corporation, ensuring continued supply chain support and manufacturing consistency.

Compliance & Certification: The 8SLVP1204ANLGI is ROHS3 compliant, meeting current environmental and regulatory requirements. Both parts maintain REACH unaffected status and identical MSL ratings, ensuring equivalent handling and storage requirements.

Performance Headroom: The substitute part provides enhanced frequency capability (2 GHz versus 650 MHz) and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), offering design margin for thermal and frequency-dependent applications.

Package Transition: The shift from 20-TSSOP to 16-VFQFN requires PCB layout modification. The 16-VFQFN package is smaller (3x3mm) and offers improved thermal performance through the exposed pad design. This transition necessitates design review and validation.

Signal Format Compatibility: The substitute part supports CML, LVDS, and LVPECL input formats. Applications utilizing HCSL, HSTL, LVHSTL, or SSTL input signals require signal conditioning or alternative component selection.

Frequently Asked Questions (FAQ)

Q: Can the 8SLVP1204ANLGI directly replace the 8523CGLF without PCB modifications?

A: No. The package change from 20-TSSOP to 16-VFQFN requires PCB layout redesign. Pin assignments, trace routing, and thermal management differ between packages. Full design validation is required before production implementation.

Q: What input signal formats are supported by the 8SLVP1204ANLGI?

A: The substitute part supports CML, LVDS, and LVPECL input formats. If your application requires HCSL, HSTL, LVHSTL, or SSTL inputs, external signal conditioning or alternative components must be evaluated.

Q: Is the supply voltage range compatible between these parts?

A: The 8SLVP1204ANLGI supply range (2.375V ~ 3.63V) overlaps with the 8523CGLF range (3.135V ~ 3.465V). The substitute part accepts lower minimum voltage (2.375V) and higher maximum voltage (3.63V), providing broader compatibility. Verify your system's supply voltage falls within both ranges.

Q: What is the difference in output signal format?

A: The 8523CGLF outputs HSTL signals, while the 8SLVP1204ANLGI outputs LVPECL signals. These are different differential signaling standards with different impedance and voltage swing characteristics. Receiver compatibility must be verified before substitution.

Q: Does the higher frequency rating (2 GHz) of the substitute part affect my 650 MHz application?

A: No. The 8SLVP1204ANLGI's 2 GHz maximum frequency exceeds the 650 MHz requirement, providing performance headroom. The part operates correctly at lower frequencies within its specified range.

Q: Are the moisture sensitivity levels equivalent?

A: Yes. Both parts carry MSL 3 (168 Hours) ratings, requiring identical handling, storage, and reflow procedures. No changes to component management are necessary.

Q: What is the advantage of the exposed pad in the 16-VFQFN package?

A: The exposed pad provides direct thermal connection to the PCB, improving heat dissipation compared to the 20-TSSOP package. This enhances thermal performance in high-frequency or high-power applications.