CYI9531OXCT Equivalent & Substitute Parts

Part Overview

The CYI9531OXCT is a clock generator IC manufactured by Skyworks Solutions Inc., designed for PCI Express (PCIe) buffering applications. This device generates a 133.3MHz output from a crystal input using an integrated Phase-Locked Loop (PLL). The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

CYI9531OXCT

Skyworks Solutions Inc.In Stock: 769CYI9531OXCT Datasheet

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SI5338M-B-GMR

Skyworks Solutions Inc.In Stock: 4154SI5338M-B-GMR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The SI5338M-B-GMR serves as a functional equivalent to the CYI9531OXCT based on the following substitution criteria:

Core Functional Parameters:

• Both devices feature integrated Phase-Locked Loop (PLL) architecture for clock generation
• Both support crystal input sources for frequency reference
• Both are manufactured by Skyworks Solutions Inc., ensuring design continuity and technical support alignment
• Both devices are classified as single-circuit clock generators

Electrical Compatibility Considerations:

• The SI5338M-B-GMR supports LVCMOS output, matching the CYI9531OXCT output standard
• The SI5338M-B-GMR maximum frequency of 200MHz exceeds the CYI9531OXCT requirement of 133.3MHz, providing operational headroom
• The SI5338M-B-GMR supply voltage range (1.71V ~ 3.63V) encompasses the CYI9531OXCT range (3.135V ~ 3.465V)

Mechanical and Packaging Differences:

• The SI5338M-B-GMR uses 24-QFN (4x4) packaging versus the CYI9531OXCT 28-SSOP package, requiring PCB layout redesign
• The SI5338M-B-GMR features improved moisture sensitivity (MSL 2, 1 Year) compared to the CYI9531OXCT (MSL 3, 168 Hours)

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility: The SI5338M-B-GMR is a valid functional substitute for the CYI9531OXCT in applications requiring clock generation with crystal input and LVCMOS output. Both devices share the same manufacturer lineage and core PLL-based architecture.

Product Status Consideration: The CYI9531OXCT is classified as obsolete, while the SI5338M-B-GMR maintains active product status with ongoing manufacturer support. Selection of the SI5338M-B-GMR ensures access to technical documentation, design support, and long-term supply availability.

Compliance and Certification: Both devices carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, maintaining regulatory compliance equivalence.

Implementation Requirements: Substitution requires PCB layout redesign due to package change from 28-SSOP to 24-QFN (4x4). The SI5338M-B-GMR's programmable architecture via I2C interface provides additional configuration flexibility beyond the fixed-function CYI9531OXCT design.

Frequently Asked Questions (FAQ)

Q: Can the SI5338M-B-GMR directly replace the CYI9531OXCT without PCB modifications?

A: No. The SI5338M-B-GMR uses 24-QFN (4x4) packaging while the CYI9531OXCT uses 28-SSOP packaging. PCB footprint redesign is required. Pin-to-pin compatibility does not exist between these package types.

Q: Are the supply voltage requirements compatible?

A: Yes, within the CYI9531OXCT operating range. The CYI9531OXCT requires 3.135V ~ 3.465V, which falls entirely within the SI5338M-B-GMR range of 1.71V ~ 3.63V. Existing power supply designs can support the substitute part.

Q: What is the frequency relationship between these devices?

A: The CYI9531OXCT operates at a maximum of 133.3MHz. The SI5338M-B-GMR supports up to 200MHz. For applications requiring exactly 133.3MHz output, the SI5338M-B-GMR can be configured to this frequency through its programmable PLL.

Q: Does the SI5338M-B-GMR support crystal input like the CYI9531OXCT?

A: Yes. The SI5338M-B-GMR accepts crystal input along with multiple other input standards (CML, CMOS, HCSL, HSCL, HSTL, LVDS, LVPECL, SSTL). Crystal input configuration is fully supported.

Q: What are the moisture handling differences?

A: The CYI9531OXCT has MSL 3 rating (168 hours), while the SI5338M-B-GMR has MSL 2 rating (1 year). The SI5338M-B-GMR provides superior moisture tolerance, reducing risk during storage and handling.

Q: Is the SI5338M-B-GMR programmable?

A: Yes. The SI5338M-B-GMR features I2C programmable architecture, allowing runtime configuration of output frequencies and formats. The CYI9531OXCT is a fixed-function device without programmability.

Q: Do both devices support the same output standards?

A: The CYI9531OXCT outputs LVCMOS only. The SI5338M-B-GMR supports LVCMOS plus additional standards (HCSL, HSTL, LVDS, LVPECL, SSTL), providing greater flexibility for different system interfaces.