Infineon Technologies CY28410OXC

Overview

CY28410OXC from Cypress Semiconductor is a dedicated clock generator IC compliant with Intel® CK410 specification for Grantsdale chipset platforms, delivering differential CPU clocks (up to 266 MHz), 100-MHz differential SRC pairs, 96-MHz dot clock, 48-MHz USB, and 33-MHz PCI clocks from a single 14.318-MHz crystal input. It supports Intel Pentium 4 and Tejas CPUs with selectable frequency modes via three LVCMOS frequency-select inputs.

For engineers reviewing the CY28410OXC datasheet, CY28410OXC pinout, CY28410OXC application, or CY28410OXC equivalent, this device requires attention to VTT_PWRGD# latching timing, I²C register-level output enable control, spread-spectrum EMI reduction configuration, and precise 20-pF parallel-resonant crystal loading - all critical for Intel Grantsdale motherboard clock tree validation.

Technical Context

The CY28410OXC integrates two PLLs: PLL1 generates the 14.318-MHz reference-derived CPU and SRC clocks, while PLL2 produces the fixed 96-MHz dot clock and 48-MHz USB clock. Frequency selection is latched synchronously on VTT_PWRGD# assertion, freezing FS_A/FS_B/FS_C states for boot-time configuration.

It implements an SMBus-compatible I²C interface (7-bit slave address 0xD2) supporting byte/block read/write operations to eight control registers, enabling dynamic per-output enable/disable, spread-spectrum toggle, and power-down drive-mode configuration - all without requiring system reset.

Key Specifications

Pinout & Package

56-pin SSOP (Small Outline Plastic) and TSSOP (Thin Shrink Small Outline Package) with 0.5-mm pitch; exposed pad absent; JEDEC MS-012AC compliant. Pin assignments validated per Cypress Document #38-07593 Rev. *C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS952006AGLFT and ICS954201AGLFT, the CY28410OXC uniquely combines Intel CK410 compliance, VTT_PWRGD#-latched frequency selection, and integrated spread spectrum - making it irreplaceable in original Grantsdale designs without functional or timing compromise.

Availability

CY28410OXC is available at Aetrix Electronics and suitable for desktop motherboard design, Intel Grantsdale-based industrial PCs, and SATA storage subsystems requiring stable component supply and long-term lifecycle support.

Supply support for CY28410OXC 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 U.S.-based semiconductor company specializing in timing, memory, and programmable solutions for computing and industrial applications.

The CY28410 belongs to Cypress's CK410-compliant clock generator product line, engineered specifically to meet Intel Grantsdale platform timing, power sequencing, and EMI requirements - not general-purpose clock synthesis.

FAQ

What crystal specifications are mandatory for CY28410OXC operation?

The CY28410OXC requires a 14.31818 MHz parallel-resonant AT-cut crystal with 20-pF load capacitance, ≤0.1 mW drive level, and ≤35 ppm initial tolerance. Substituting a series-resonant crystal causes frequency error exceeding ±300 ppm and violates Intel CK410 timing budgets.

How does VTT_PWRGD# affect frequency selection and output enable states?

VTT_PWRGD# is a level-sensitive strobe that latches FS_A/FS_B/FS_C logic levels and PCIF0/ITP_EN state at the moment it transitions low. After latching, further changes to these pins are ignored until next power cycle - ensuring deterministic boot-time clock configuration.

Can the I²C interface be used to modify clock outputs during system operation?

No. The I²C interface supports only initialization-time configuration - enabling/disabling outputs, toggling spread spectrum, or setting drive strength. It cannot be used for runtime power management or dynamic frequency switching due to lack of interrupt or status reporting capability.

Why does CY28410OXC use five separate 3.3V power domains?

Separate VDD_CPU, VDD_SRC, VDD_PCI, VDD_48, and VDD_REF rails isolate noise coupling between high-speed differential outputs (CPU/SRC), noisy single-ended buses (PCI/USB), and sensitive analog PLL circuitry - maintaining sub-100 ps jitter performance across all clock domains.