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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Infineon Technologies CY2280PVXC-11S

Name: CY2280PVXC-11S
Brand: Infineon Technologies
SKU: CY2280PVXC-11S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY2280PVXC-11S

Manufacturer:: Infineon Technologies

Category:: Application Specific Clock/Timing

Package:: 48-BSSOP (0.295", 7.50mm Width)

Datasheet:: CY2280PVXC-11S.pdf

Description:: IC CLOCK SYNTH SS 48SSOP

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Product details

Overview

CY2280PVXC-11S from Cypress Semiconductor Corporation is a 100-MHz spread spectrum clock synthesizer/driver for Pentium® II and compatible processor motherboards, delivering four 2.5V CPU clocks (66.67/100 MHz), eight 3.3V PCI clocks (CPU/2 or CPU/3), two 48-MHz USB clocks, three 14.318-MHz reference clocks, and two 2.5V APIC clocks - all in a 48-pin SSOP package with factory-programmable downspread (−0.6%) for EMI reduction.

For engineers reviewing the CY2280PVXC-11S datasheet, CY2280PVXC-11S pinout, CY2280PVXC-11S application, or CY2280PVXC-11S equivalent, key selection considerations include CPU-PCI skew (1.5–4.0 ns), spread-spectrum enable via SEL_SS, mixed 2.5V/3.3V supply domains, and power management inputs (CPU_STOP, PCI_STOP, PWR_DWN) for glitch-free clock gating in mobile/desktop PC platforms.

Technical Context

The CY2280PVXC-11S integrates dual PLLs (CPU and SYS) with on-chip synchronization logic to ensure glitch-free transitions during power-state changes. It supports both 66.67 MHz and 100 MHz CPU frequencies selected via SEL100/SEL1/SEL0, with fixed CPU/PCI ratios of 2 or 3.

Spread spectrum modulation is implemented as a downspread (−0.6%) at 30–33 kHz on CPU and PCI outputs only; APIC and USB clocks remain unmodulated. The device uses a parallel-resonant 14.318 MHz crystal (C_LOAD = 18 pF) and provides independent voltage domains: VDDCPU/VDDAPIC (2.375–2.625 V), VDDPCI/VDDUSB/VDDREF/AVDD (3.135–3.465 V).

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Clock Frequency	66.67 MHz or 100 MHz - selectable via SEL100/SEL1/SEL0; actual measured values: 66.654 MHz (−195 ppm) and 99.77 MHz (−2346 ppm)
PCI Clock Frequency	33.33 MHz (CPU/2 or CPU/3) - eight synchronized outputs with 1.5–4.0 ns CPU-PCI skew
Spread Spectrum	−0.6% downspread on CPU & PCI clocks only - enabled by SEL_SS low; modulation frequency 30–33 kHz
Output Drive Strength	CPUCLK/APIC: IOH = 12 mA / IOL = 12 mA @ 2.375 V; PCICLK/USBCLK/REF: IOH = 14.5–16 mA / IOL = 9–9.4 mA @ 3.135 V
Power Management	CPU_STOP (active-low): drives CPUCLK[0:3] LOW; PCI_STOP (active-low): drives PCICLK[1:7] LOW; PWR_DWN (active-low): shuts down PLLs & drives all outputs LOW
Supply Voltage Ranges	VDDCPU/VDDAPIC: 2.375–2.625 V; VDDPCI/VDDUSB/VDDREF/AVDD: 3.135–3.465 V - enables mixed-voltage motherboard integration
Clock Skew	CPU-CPU: ≤175 ps; CPU-PCI: 1.5–4.0 ns; PCI-PCI: ≤250 ps - ensures timing margin compliance for synchronous bus interfaces

Pinout & Package

Package: 48-pin SSOP (Small Outline Package), 0.300-inch body width, lead pitch 0.025 inch.

Pin/Terminal	Circuit Role	Design Meaning
CPUCLK[0:3] (Pins 35,36,39,40)	CPU clock outputs	Four 2.5V CMOS clocks at 66.67/100 MHz; duty cycle 45–55%; rise/fall time 0.4–1.6 ns
PCICLK[1:7], PCICLK_F (Pins 7–11,13–17)	PCI clock outputs	Eight 3.3V CMOS clocks (seven gated + one free-running); edge rate 1.0–4.0 V/ns; skew ≤250 ps between PCI outputs
APIC[0:1] (Pins 44,45)	APIC clock outputs	Two 2.5V CMOS clocks at 14.318 MHz; CPU-APIC skew 2.0–4.5 ns (only in -21S variant; not applicable to -11S)
REF[0:2] (Pins 1,2,47)	Reference clock outputs	Three 3.3V CMOS clocks at 14.318 MHz - used for audio/video codec or peripheral timing reference
USBCLK[0:1] (Pins 22,23)	USB clock outputs	Two 3.3V CMOS clocks at 48.008 MHz (±167 ppm) - compliant with USB 1.1 full-speed timing requirements
SEL_SS (Pin 28)	Spread spectrum control input	Active-low signal enabling −0.6% downspread on CPU & PCI clocks; no effect when deasserted
CPU_STOP (Pin 30), PCI_STOP (Pin 31), PWR_DWN (Pin 29)	Power management control inputs	Asynchronous active-low signals for coordinated clock gating and system-level power state transitions
VDDCPU (Pins 37,41), VDDAPIC (Pin 46)	2.5V supply domains	Independent power rails for CPU/APIC clock buffers - decoupling required per JEDEC guidelines
VDDPCI (Pins 9,15), VDDUSB (Pin 21), VDDREF (Pin 48), AVDD (Pins 19,33)	3.3V supply domains	Dedicated supplies per clock group minimize cross-talk and support simultaneous multi-rail operation

Key Features

Feature	Design Value
Mixed 2.5V/3.3V supply architecture	Enables direct interface to Pentium II CPU core (2.5V) and legacy PCI/USB peripherals (3.3V) without level shifters
Factory-EPROM programmable spread spectrum	Fixed −0.6% downspread on CPU/PCI clocks eliminates need for external modulation circuitry or firmware tuning
Glitch-free clock gating	On-chip synchronization logic ensures zero-cycle glitches during CPU_STOP/PCI_STOP assertion - critical for ACPI S3/S4 states
Multi-domain power management	Independent PWR_DWN, CPU_STOP, and PCI_STOP inputs allow hierarchical power-down sequencing aligned with Intel PIIX4 specifications
Low-jitter clock distribution	CPU clock cycle-cycle jitter ≤250 ps; PCI clock cycle-cycle jitter ≤500 ps - meets Pentium II motherboard timing budgets

Applications

Desktop PC Motherboard

Laptop System Board

Use Scenario: Mainboard clock generation for Pentium II-based desktop systems with PCI expansion slots and integrated USB ports.

IC Role / Device Role / Timing Role: Primary clock synthesizer providing synchronized CPU, PCI, USB, and reference clocks with spread spectrum enabled to meet FCC Class B EMI limits.

Use Value: Eliminates need for discrete clock generators and external spread-spectrum modulators, reducing BOM count and PCB area by >30%.

Use Scenario: Power-optimized clock solution for portable PCs requiring dynamic clock gating during suspend/resume cycles.

IC Role / Device Role / Timing Role: Central timing hub managing CPU clock stop, PCI clock stop, and full power-down modes under ACPI control.

Use Value: Achieves <500 µA power-down current and sub-3 ms clock stabilization on wake-up - directly supporting Intel Mobile Platform power targets.

Industrial Control PC

Embedded x86 Computing Module

Use Scenario: Fanless industrial PC operating in extended temperature range (0°C to 70°C) with strict EMI requirements in factory automation environments.

IC Role / Device Role / Timing Role: Robust clock source delivering stable 100-MHz CPU timing and low-skew PCI clocks despite thermal cycling and electrical noise.

Use Value: Guaranteed 1.5–4.0 ns CPU-PCI skew and ±250 ps cycle-cycle jitter ensure deterministic bus arbitration across temperature extremes.

Use Scenario: Compact COM Express or ETX module integrating Pentium II-class processing with legacy I/O interfaces.

IC Role / Device Role / Timing Role: Single-package clock solution supplying all required timing signals (CPU, PCI, USB, APIC, REF) with minimal external components.

Use Value: 48-pin SSOP footprint and mixed-voltage support reduce layout complexity and eliminate interposer boards in space-constrained modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock synthesizer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICS9171-11T	Single 3.3V supply only; no 2.5V outputs; supports 133-MHz CPU but lacks APIC outputs	Targeted at later-generation Pentium III systems; no native support for APIC interrupt timing	Select if upgrading to higher-frequency CPUs and APIC timing is not required
ICS9248AF	Integrated crystal oscillator; no external XTALIN/XTALOUT pins; fixed 100-MHz CPU output only	Designed for cost-sensitive embedded designs where crystal BOM reduction outweighs configurability needs	Select if board space is constrained and spread spectrum flexibility is secondary to integration

Compared with ICS9171-11T and ICS9248AF, the CY2280PVXC-11S uniquely supports mixed 2.5V/3.3V operation, factory-programmable spread spectrum, and dedicated APIC clock outputs - making it the only option qualified for original Pentium II desktop/laptop motherboard designs requiring full specification compliance.

Availability

CY2280PVXC-11S is available at Aetrix Electronics and suitable for desktop PC motherboards, laptop system boards, and industrial control PCs requiring stable component supply, long-lifecycle availability, and EMI-compliant clock synthesis.

Supply support for CY2280PVXC-11S includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor Corporation, headquartered in San Jose, CA, is a fabless semiconductor company specializing in high-performance timing, memory, and programmable logic solutions for computing and communications markets.

The CY2280 product line was designed specifically to address the clocking architecture requirements of Intel Pentium II–based platforms, integrating CPU, PCI, USB, APIC, and reference timing into a single, EMI-optimized package.

FAQ

What is the function of the SEL_SS pin on the CY2280PVXC-11S?

The SEL_SS pin (Pin 28) is an active-low input that enables −0.6% downspread modulation on CPU and PCI clock outputs. When asserted (low), it activates the spread spectrum function at 30–33 kHz; when deasserted (high), all clocks operate at nominal frequency without modulation. This pin has no effect on APIC, USB, or REF outputs.

Does the CY2280PVXC-11S support both 66.67 MHz and 100 MHz CPU clock outputs?

Yes. CPU frequency is selected using the SEL100, SEL1, and SEL0 inputs per the documented function table. Setting SEL100=1, SEL1=1, SEL0=1 produces 100 MHz CPUCLK outputs; SEL100=0, SEL1=1, SEL0=1 yields 66.67 MHz. Both frequencies are factory-verified and characterized across temperature and voltage ranges.

How does the CY2280PVXC-11S handle power management states like CPU stop or power-down?

It implements three dedicated control inputs: CPU_STOP (Pin 30) forces CPUCLK[0:3] LOW; PCI_STOP (Pin 31) forces PCICLK[1:7] LOW while leaving PCICLK_F active; PWR_DWN (Pin 29) disables both PLLs and drives all outputs LOW. All transitions are synchronized internally to prevent glitches during state changes.

Can the CY2280PVXC-11S be used with a 14.31818 MHz crystal?

Yes. The device requires a parallel-resonant crystal with nominal frequency 14.318 MHz and load capacitance C_LOAD = 18 pF, matching standard PC reference crystals. Measured USBCLK output is 48.008 MHz (±167 ppm), confirming tight lock to this crystal standard and validating compatibility with industry-standard timing sources.

CY2280PVXC-11S Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 48-BSSOP (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: Intel CPU Servers

Input:: Clock

Output:: Clock

Number of Circuits:: 1

Ratio - Input:Output:: 1:19

Differential - Input:Output:: No/No

Frequency - Max:: 100MHz

Voltage - Supply:: 2.375V ~ 3.465V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 48-SSOP

CY2280PVXC-11S FAQ

1.How can I place an order for CY2280PVXC-11S through Aetrix?

Please submit a Request for Quotation (RFQ) for CY2280PVXC-11S on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CY2280PVXC-11S reliable?

The price and inventory of CY2280PVXC-11S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY2280PVXC-11S is usually 5 days.

3.What payment methods are accepted for CY2280PVXC-11S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY2280PVXC-11S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY2280PVXC-11S?

CY2280PVXC-11S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY2280PVXC-11S order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CY2280PVXC-11S?

For technical support, including CY2280PVXC-11S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY2280PVXC-11S requirements.

6.How does Aetrix verify that CY2280PVXC-11S is sourced from the original manufacturer or authorized distributors?

All CY2280PVXC-11S products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY2280PVXC-11S meets industry standards.

7.What is the process for return or replacement of CY2280PVXC-11S?

All CY2280PVXC-11S units undergo pre-shipment inspection (PSI). If there is an issue with CY2280PVXC-11S, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CY2280PVXC-11S part is unused and in its original packaging.

Return procedure for CY2280PVXC-11S:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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