Infineon Technologies CY2542QC002T

Overview

CY2542QC002T from Infineon Technologies (formerly Cypress) is a quad-PLL programmable spread spectrum clock generator with two-wire serial interface and frequency select capability. It synthesizes up to eight independent output clocks (3–166 MHz), supports 1.5/1.8/2.5/3.0/3.3 V output banks, delivers 150 ps typical cycle-to-cycle jitter, and integrates four fully configurable PLLs-including two with spread spectrum-for EMI reduction in PC and networking systems.

For engineers reviewing the CY2542QC002T datasheet, CY2542QC002T pinout, CY2542QC002T application, or CY2542QC002T equivalent, key selection criteria include bank-specific output voltage control (VDD_CLK_B1/B2/B3), glitch-free frequency switching via FS0/FS1, nonvolatile PLL configuration, I²C-compatible serial programming at 400 kbps, and factory-programmable spread spectrum profiles (±0.125% to ±2.5% center-spread or –0.25% to –5.0% down-spread).

Technical Context

The CY2542QC002T implements four independent PLLs-PLL1 and PLL2 without spread spectrum, PLL3 and PLL4 with programmable center/down-spread modulation-enabling simultaneous generation of unrelated frequencies across eight outputs. Input reference support includes 8–48 MHz crystal or 1–48 MHz external clock (1.8 V logic level), with internal crystal oscillator circuitry requiring no external load capacitors.

Its crossbar switch architecture allows arbitrary assignment of five clock sources (XIN/EXCLKIN, PLL1–PLL4) to CLK1–CLK8, while three dedicated output power banks (VDD_CLK_B1/B2/B3) enable mixed-voltage clock distribution. Frequency select pins FS0/FS1 provide hardware-based switching among four preprogrammed PLL configurations without serial interface intervention.

Key Specifications

Pinout & Package

24-pin QFN package (4 × 4 × 0.6 mm), RoHS-compliant, exposed thermal pad, commercial temperature range (0 °C to 70 °C).

Key Features

Applications

Equivalent & Alternatives

Two verified alternatives exist for CY2542QC002T with documented functional overlap and known trade-offs in output count, spread spectrum flexibility, and programming model.

Compared with Si5351A-B-GM and ICS8430I-01, CY2542QC002T uniquely combines quad-PLL architecture, three independently powered output banks, hardware-based frequency select, and factory-programmable spread spectrum-making it optimal for complex, mixed-voltage, EMI-constrained systems requiring eight precisely coordinated clocks.

Availability

CY2542QC002T is available at Aetrix Electronics and suitable for PC motherboard design, networking switch timing, consumer set-top box development, and industrial embedded controller applications requiring stable component supply and long-term lifecycle support.

Supply support for CY2542QC002T 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and security solutions for automotive, industrial, and IoT markets.

CY2542QC002T belongs to Infineon's Precision Clock Generation product line-designed specifically for high-integration, low-EMI timing in compute-intensive and communications infrastructure systems requiring multi-frequency, multi-voltage clock distribution.

FAQ

What is the maximum output frequency supported by CY2542QC002T at 1.8 V output voltage?

The CY2542QC002T supports a maximum output frequency of 50 MHz when configured for 1.5 V or 1.8 V output voltage levels-verified under recommended operating conditions (VDD_CLK_Bx = 1.8 V ± 5%, TA = 25 °C). This limit applies to all eight outputs regardless of PLL source or spread spectrum setting.

Can CY2542QC002T operate without an external crystal?

Yes-CY2542QC002T accepts a 1–48 MHz single-ended 1.8 V external reference clock on the XIN/EXCLKIN pin (Pin 24), bypassing the internal crystal oscillator. In this mode, XOUT (Pin 23) is left unconnected, and the device operates with identical PLL performance and output specifications.

How does the PD#/OE pin function in output-enable mode?

When programmed as OE (output enable), Pin 4 controls all eight clock outputs simultaneously: logic high enables outputs per current register state; logic low forces CLK1–CLK8 to low-impedance low state before entering high-impedance shutdown. Outputs retain their last programmed frequency and drive strength upon re-enable.

Is spread spectrum available on all four PLLs?

No-only PLL3 and PLL4 support spread spectrum modulation (center-spread or down-spread). PLL1 and PLL2 are standard integer-N PLLs optimized for ultra-low jitter (<150 ps) in critical timing paths such as CPU reference clocks or ADC sampling clocks.