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

Infineon Technologies CY28442ZXC-2

Name: CY28442ZXC-2
Brand: Infineon Technologies
SKU: CY28442ZXC-2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY28442ZXC-2

Manufacturer:: Infineon Technologies

Category:: Application Specific Clock/Timing

Package:: 56-TFSOP (0.240", 6.10mm Width)

Datasheet:: CY28442ZXC-2.pdf

Description:: IC CLOCK GEN ALVISO 56-TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,885

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Product details

Overview

CY28442ZXC-2 from Cypress Semiconductor is a programmable clock generator compliant with Intel® CK410M specification, designed for Intel Pentium-M CPU platforms. It delivers differential 100-MHz SRC clocks, 96-MHz dot clock, 48-MHz USB clock, 33-MHz PCI clock, and supports spread-spectrum modulation for EMI reduction. Operates from a single 3.3V supply in a 56-pin TSSOP package.

For engineers reviewing the CY28442ZXC-2 datasheet, CY28442ZXC-2 pinout, CY28442ZXC-2 application, or CY28442ZXC-2 equivalent, key selection criteria include I²C-configurable clock enable/disable per output, selectable CPU frequencies (100/133/166/200 MHz), independent CLKREQ# control of SRC outputs, and Lexmark-optimized spread-spectrum profile for flat-panel display timing compliance.

Technical Context

The CY28442ZXC-2 integrates three PLLs: PLL1 for CPU clock generation, PLL2 for SRC/PCI clocks, and PLL3 for 96-/100-MHz spreadable dot clock. All outputs are LVDS-compatible differential pairs with configurable drive strength and stoppability via dedicated CLKREQ# pins or system STP# signals.

Frequency selection is determined at power-up by sampling FS_A/FS_B/FS_C logic levels upon VTT_PWRGD# assertion, locking configuration permanently until reset. I²C interface (7-bit slave address 0xD2) enables runtime register access to control individual output enables, spread-spectrum settings, and stop modes - though not intended for dynamic power management during operation.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Clock Output	Configurable 100/133/166/200 MHz differential pair; selected at boot via FS pins
SRC Clock Output	Seven 100-MHz differential serial reference clock pairs (SRCT/CPUC[1:7]); individually stoppable
Dot Clock	Fixed 96-MHz differential output (DOT96T/C); supports spread-spectrum modulation
USB Clock	48-MHz single-ended output; enabled/disabled via I²C register Byte 1 bit 5
PCI Clock	33-MHz single-ended output; stoppable via PCI_STP# or software control
Supply Voltage	3.3V ±5% across five independent power domains (VDD_CPU, VDD_SRC, VDD_48, etc.)
Interface	I²C-compatible serial bus (SCLK/SDATA); supports byte/block read/write; slave address 0xD2

Pinout & Package

Package: 56-pin TSSOP (0.24-inch body width, 0.5-mm pitch), RoHS-compliant, moisture sensitivity level 3.

Pin/Terminal	Circuit Role	Design Meaning
1,2	VDD_REF / VSS_REF	3.3V supply and ground for REF1/REF0 clock outputs
3–5	PCI[1:3]	33-MHz single-ended PCI clock outputs
8	ITP_EN/PCIF0	Selects between CPU2_ITP or SRC7 output on pins 36/35
14,15	DOT96T / DOT96C	Fixed 96-MHz differential dot clock output pair
17,18	96_100_SSCT / 96_100_SSCC	Differential 96-/100-MHz spread-spectrum clock for flat-panel displays
19–25,30,31	SRCT/CPUC[1:5], SRCT6/SRCC6, SRCT7/SRCC7	Seven 100-MHz differential SRC clock pairs; SRCT6/SRCC6 and SRCT7/SRCC7 are CLKREQ#-controllable
32,33	CLKREQA# / CLKREQB#	Active-low inputs to stop assigned SRC outputs; assignment configurable via I²C register Byte 8
40–44,45	CPUT/CPUC[0:2], VSS_CPU	Differential CPU clock outputs (up to 200 MHz) and associated ground
46,47	SCLK / SDATA	I²C bus interface for configuration and status readback
49,50	XOUT / XIN	14.318-MHz crystal oscillator buffer outputs/inputs
52	REF1	Fixed 14.318-MHz single-ended reference clock output
54,55	CPU_STP# / PCI_STP#	Active-low system stop signals to gate CPU and PCI clock outputs

Key Features

Feature	Design Value
Intel CK410M Compliance	Fully meets timing, voltage, and functional requirements for Alviso chipset platforms
Lexmark Spread Spectrum Profile	Predefined modulation depth/rate optimized for EMI reduction in notebook LCD applications
Per-Output Clock Control	Each of 14+ clock outputs independently enabled/disabled and stoppable via I²C or hardware pins
Multi-Domain Power Isolation	Separate VDD/VSS rails for CPU, SRC, 48MHz, PCI, and PLL sections minimize crosstalk
Boot-Time Frequency Locking	FS_A/B/C sampling on VTT_PWRGD# assertion prevents runtime frequency reconfiguration

Applications

Notebook Platform Timing

Flat-Panel Display Interface

Use Scenario: Intel Pentium-M-based laptop motherboard requiring synchronized CPU, SRC, PCI, and USB clocks.

IC Role / Device Role / Timing Role: Primary clock synthesizer generating all core platform clocks from a single 14.318-MHz crystal.

Use Value: Eliminates need for multiple discrete oscillators; reduces BOM count and layout complexity while ensuring Intel CK410M timing compliance.

Use Scenario: Driving LVDS timing controller in 15.4-inch WXGA TFT-LCD panel.

IC Role / Device Role / Timing Role: Source of 96-MHz differential dot clock with integrated spread-spectrum modulation.

Use Value: Meets FCC Class B EMI limits without external filtering; eliminates separate SSCG IC and associated layout area.

SATA Reference Clock Distribution

PCI Express Lane Clocking (Legacy)

Use Scenario: Providing clean 100-MHz differential reference clock to SATA PHY layer on chipset.

IC Role / Device Role / Timing Role: Dedicated SRCT4_SATAT/SRCC4_SATA output pair with low-jitter performance.

Use Value: Matches SATA Gen1 spec jitter requirements (<1.5 ps RMS); avoids signal integrity issues from long trace routing.

Use Scenario: Supplying 33-MHz PCI clock to legacy add-in cards in mobile docking station.

IC Role / Device Role / Timing Role: Single-ended PCI clock generator with PCI_STP#-controlled gating.

Use Value: Enables dynamic power-down of PCI bus during sleep states without clock glitches or metastability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT 8T49N241	Higher integration: includes PCIe Gen3/Gen4 reference clocks, JESD204B support, and dual-loop PLL architecture	Targets modern server/communications platforms; lacks CK410M-specific features like Lexmark SSC profile	Choose when upgrading from Pentium-M to Core i-series or requiring multi-protocol clock synthesis
ON Semi NB3N3020B	Lower pin count (32-QFN), fixed 100-MHz SRC only, no I²C interface, no spread spectrum	Cost-optimized for basic SRC-only notebooks without display or USB clocking needs	Choose only if CK410M compliance, dot clock, or USB clock are unnecessary and BOM cost is primary constraint

Compared with IDT 8T49N241 and ON Semi NB3N3020B, the CY28442ZXC-2 uniquely balances Intel-specific platform compliance, display-optimized spread spectrum, and granular per-output control - making it irreplaceable for legacy Alviso-based designs where timing accuracy, EMI certification, and pin-for-pin compatibility are mandatory.

Availability

CY28442ZXC-2 is available at Aetrix Electronics and suitable for notebook platform timing, flat-panel display interface, SATA reference clock distribution, and legacy PCI Express lane clocking requiring stable component supply and full CK410M compliance.

Supply support for CY28442ZXC-2 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 (now part of Infineon Technologies) is a fabless semiconductor company specializing in high-performance timing, memory, and programmable logic solutions for computing and communications markets.

The CY28442 product line was engineered specifically for Intel mobile chipset platforms, delivering tightly specified clock trees with integrated spread-spectrum and system-level power management signaling.

FAQ

What is the function of the VTT_PWRGD# pin?

VTT_PWRGD# is a level-sensitive strobe that latches FS_A/FS_B/FS_C and ITP_EN/PCIF0 logic states at power-up to configure CPU frequency and output routing. After initial assertion (active LOW), it transitions to a real-time power-down input (active HIGH) for synchronous clock gating. Its timing must meet setup/hold requirements relative to VDD stabilization.

Can the 96-MHz dot clock be used at 100 MHz?

No - DOT96T/C outputs are hardwired to 96 MHz and cannot be reconfigured to 100 MHz. The 100-MHz capability applies only to the SRCT/CPUC differential pairs and the 96_100_SSCT/SSCC outputs, which are switchable via PCIF1/96_100_SEL pin (pin 9) sampled at VTT_PWRGD# assertion.

How is spread-spectrum modulation controlled?

Spread-spectrum is enabled per PLL via Control Register 0 bit 0 (CPU PLL1) and Control Register 4 bit 7 (96_100_SSC). The modulation profile (center frequency, deviation, rate) is fixed per the Lexmark specification and not user-adjustable; enabling it activates the pre-characterized waveform.

Is the I²C interface operational during system suspend?

No - the I²C interface is disabled during power-down states triggered by CPU_STP#, PCI_STP#, or VTTPWR_GD#/PD assertion. Configuration changes must occur during system initialization before entering low-power modes; runtime register access is unsupported during active suspend/resume sequences.

CY28442ZXC-2 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 56-TFSOP (0.240", 6.10mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: Intel CPU Servers

Input:: LVTTL, Crystal

Output:: Clock

Number of Circuits:: 1

Ratio - Input:Output:: 3:14

Differential - Input:Output:: No/Yes

Frequency - Max:: 200MHz

Voltage - Supply:: 3.135V ~ 3.465V

Operating Temperature:: 0°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 56-TSSOP II

CY28442ZXC-2 FAQ

1.How can I place an order for CY28442ZXC-2 through Aetrix?

Please submit a Request for Quotation (RFQ) for CY28442ZXC-2 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 CY28442ZXC-2 reliable?

The price and inventory of CY28442ZXC-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY28442ZXC-2 is usually 5 days.

3.What payment methods are accepted for CY28442ZXC-2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY28442ZXC-2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY28442ZXC-2?

CY28442ZXC-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY28442ZXC-2 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 CY28442ZXC-2?

For technical support, including CY28442ZXC-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY28442ZXC-2 requirements.

6.How does Aetrix verify that CY28442ZXC-2 is sourced from the original manufacturer or authorized distributors?

All CY28442ZXC-2 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 CY28442ZXC-2 meets industry standards.

7.What is the process for return or replacement of CY28442ZXC-2?

All CY28442ZXC-2 units undergo pre-shipment inspection (PSI). If there is an issue with CY28442ZXC-2, 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 CY28442ZXC-2 part is unused and in its original packaging.

Return procedure for CY28442ZXC-2:

1.Submit a request within 90 days.

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

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