Infineon Technologies CY2544QC011

Overview

CY2544QC011 from Cypress Semiconductor is a quad-PLL programmable clock generator with spread spectrum capability, designed for precise multi-frequency synthesis in timing-critical systems. It delivers nine programmable LVCMOS clock outputs (3–166 MHz), supports 1.8 V/2.5 V/3.0 V/3.3 V bank-specific output voltages, integrates Fractional-N synthesis for zero-PPM error, and features glitch-free frequency switching via three FS pins - used in PC motherboard clock trees and embedded networking controllers.

For engineers reviewing the CY2544QC011 datasheet, CY2544QC011 pinout, CY2544QC011 application, or CY2544QC011 equivalent, key selection criteria include its four independent PLLs, per-bank VDD_CLK supply flexibility, spread spectrum modulation profiles (Lexmark/Linear), and 24-pin QFN package compatibility with high-density PCB layouts.

Technical Context

The CY2544QC011 implements four fully integrated PLLs - two with spread spectrum (PLL3/PLL4) and two without - enabling simultaneous generation of unrelated frequencies from a single 8–48 MHz crystal or 8–166 MHz external reference. Input voltage support includes 1.8 V for CLKIN/XIN and 2.5/3.0/3.3 V for VDD and VDD_CLK banks.

Its crossbar switch architecture allows arbitrary routing of six clock sources (XIN/EXCLKIN, CLKIN, PLL1–PLL4) to any of nine outputs. Each output bank (Bank1: CLK1–CLK3; Bank2: CLK4–CLK6; Bank3: CLK7–CLK9) has independent drive strength control, glitch-free divider-based frequency switching, and SSON-enabled spread spectrum activation.

Key Specifications

Pinout & Package

24-pin QFN (4×4 mm, 0.5 mm pitch), RoHS-compliant, exposed thermal pad. Pin assignments validated per Cypress Document 001-12563 Rev. *M.

Key Features

Applications

Equivalent & Alternatives

CY2544QC011 alternatives are selected based on identical quad-PLL architecture, 24-pin QFN packaging, and spread spectrum capability.

Compared with CY2546QC011 and CY2548QC011, CY2544QC011 uniquely supports both crystal and 1.8 V external reference inputs while maintaining full 1.8/2.5/3.0/3.3 V bank flexibility - making it the most versatile variant for mixed-signal, multi-rail designs requiring EMI reduction and zero-PPM synthesis.

Availability

CY2544QC011 is available at Aetrix Electronics and suitable for PC motherboard clock trees, industrial PLC backplanes, and embedded media gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for CY2544QC011 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 programmable system-on-chip (PSoC), memory, and timing solutions for industrial, automotive, and consumer applications.

CY2544QC011 belongs to the CY254x Quad-PLL Clock Generator product line, engineered for high-precision, low-jitter, spread-spectrum clock synthesis in complex multi-clock domain systems - targeting EMI-sensitive computing and communications platforms.

FAQ

What is the maximum output frequency supported by CY2544QC011?

CY2544QC011 supports a maximum output frequency of 166 MHz across all nine clock outputs. This specification is guaranteed under recommended operating conditions (VDD = 2.5–3.3 V, TA = 0–70°C) and applies to any output bank when configured with appropriate PLL multiplication and output divider settings.

Does CY2544QC011 require external programming hardware?

No. CY2544QC011 features one-time programmability (OTP) that can be performed using Cypress's ClockWizard software and a standard USB-based programmer (e.g., MiniProg3). Programming is done prior to system integration and does not require in-circuit debug infrastructure.

Can CY2544QC011 generate different spread spectrum profiles on separate PLLs?

Yes. Only PLL3 and PLL4 support spread spectrum, but each can be independently configured for center-spread (±0.125% to ±2.50%) or down-spread (–0.25% to –5.0%) using Lexmark or Linear modulation profiles - enabling targeted EMI suppression for specific clock domains.

Is the 24-pin QFN package of CY2544QC011 pin-compatible with CY2546QC011 and CY2548QC011?

Yes. All three variants share identical 24-pin QFN footprints and pin functions, with differences limited to internal voltage support and crystal interface (XIN/XOUT presence/absence). This enables drop-in replacement in many designs with minor power supply and reference clock adjustments.