Infineon Technologies CY28441ZXC

Overview

CY28441ZXC from Cypress Semiconductor is a clock generator IC designed specifically for Intel Alviso chipset platforms, supporting Pentium®-M CPU timing with 100-MHz differential SRC clocks, 96-MHz differential dot clock, and 48-MHz USB clock outputs. It features I²C programmability, selectable CPU frequencies via FS_A/B/C pins, and Lexmark-optimized spread-spectrum EMI reduction.

For engineers reviewing the CY28441ZXC datasheet, CY28441ZXC pinout, CY28441ZXC application, or CY28441ZXC equivalent, key selection criteria include differential clock pair support (CPUT/CPUC, SRCT/SRCC), CLKREQ#-controlled clock gating, PCI_STP#/CPU_STP#-synchronized output stop, and 56-pin TSSOP package compatibility with Intel CK410M compliance.

Technical Context

The CY28441ZXC integrates two PLLs: one for CPU/REF/DOT96/USB generation from a 14.318-MHz crystal input (XIN/XOUT), and another for SRC clock synthesis. It supports frequency selection via three 3.3V-tolerant FS pins sampled on VTT_PWRGD# assertion, enabling discrete CPU clock modes (100/133 MHz) and fixed outputs including 33-MHz PCI, 14.318-MHz REF, and SATA-compatible 100-MHz differential serial reference clocks.

Its SMBus interface (SCLK/SDATA) provides byte- and block-level register access to control individual output enables, spread-spectrum activation, drive strength, and stop behavior under CPU_STP#, PCI_STP#, or CLKREQ# signals. All differential outputs comply with LVDS electrical specifications and support Hi-Z or driven stop modes per register configuration.

Key Specifications

Pinout & Package

Package: 56-pin Thin Shrink Small Outline Package (TSSOP), 0.5 mm pitch, RoHS-compliant, thermal pad exposed on bottom (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT 87410AGLFT and ICS954203AF, the CY28441ZXC uniquely integrates USB_48 generation, Lexmark EMI profile, and SATA-optimized SRC4 outputs - making it the only option that satisfies full Intel Alviso timing requirements with zero external clock components.

Availability

CY28441ZXC is available at Aetrix Electronics and suitable for mobile notebook platforms, Intel Pentium®-M embedded systems, and SATA storage controller boards requiring stable component supply and long-term lifecycle support.

Supply support for CY28441ZXC 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 is a U.S.-based semiconductor company specializing in timing, memory, and programmable solutions, acquired by Infineon in 2020 while maintaining legacy product support.

The CY28441 belongs to Cypress's CK410M-compliant clock generator product line, engineered specifically for Intel Alviso-based mobile platforms requiring tightly synchronized multi-clock domain timing with EMI-aware spread-spectrum capability.

FAQ

What crystal type is required for CY28441ZXC operation?

The CY28441ZXC requires a parallel-resonance 14.318-MHz crystal connected between XIN and XOUT. Using a series-resonance crystal causes a ~300-ppm frequency shift and violates output accuracy specifications. Crystal load capacitance must match the device's internal 12 pF nominal value.

How does CPU frequency selection work on CY28441ZXC?

CPU frequency (100 MHz or 133 MHz) is selected by applying specific logic levels to FS_A, FS_B, and FS_C prior to VTT_PWRGD# assertion. The chip samples these pins once on VTT_PWRGD# falling edge; subsequent changes are ignored unless entering test mode. Table 1 in the datasheet defines all valid combinations.

Can CY28441ZXC generate clocks for SATA Gen2 applications?

Yes - the SRC4_SATAT/SRC4_SATAC outputs (pins 26/27) deliver 100-MHz differential clocks meeting SATA Gen1/Gen2 jitter and amplitude requirements. These outputs are dedicated, independently controllable, and optimized for low-noise PCB routing to SATA PHYs without external conditioning.

Is I²C communication supported during system runtime?

No - the SMBus interface (SCLK/SDATA) is intended for system initialization only. Register writes must occur before or during early boot; the interface is not designed for dynamic power management or runtime clock reconfiguration. Attempting mid-operation access may cause undefined output behavior.