Infineon Technologies CY2545QC022T

Overview

CY2545QC022T from Cypress Semiconductor is a quad-PLL programmable spread spectrum clock generator with I²C interface, designed for precise multi-frequency synthesis in timing-critical systems. It delivers eight programmable clock outputs (3–166 MHz), supports fractional-N synthesis for zero-PPM error, operates from 2.5 V/3.0 V/3.3 V core supply, and integrates spread spectrum modulation (±0.125% to ±2.5%, down-spread –0.25% to –5.0%) for EMI reduction in PC and networking applications.

For engineers reviewing the CY2545QC022T datasheet, CY2545QC022T pinout, CY2545QC022T application, or CY2545QC022T equivalent, this device offers glitch-free frequency switching via FS pin, bank-specific output voltage selection (1.8 V/2.5 V/3.0 V/3.3 V), nonvolatile configuration storage, and I²C-based real-time reprogramming of PLLs, drive strength, and crystal load capacitance.

Technical Context

The CY2545QC022T implements four independent, I²C-programmable PLLs-two with spread spectrum (PLL3/PLL4) and two without (PLL1/PLL2)-enabling up to eight synchronized yet unrelated output frequencies from a single 8–48 MHz crystal or 8–166 MHz reference clock. Its crossbar switch allows arbitrary mapping of six clock sources (XIN/EXCLKIN, CLKIN, PLL1–PLL4) to eight outputs.

It features three independent output banks (Bank1: CLK1/CLK2; Bank2: CLK3–CLK5; Bank3: CLK6–CLK8), each with dedicated voltage supplies (VDD_CLK_B1/B2/B3), enabling mixed-voltage clock distribution. The device supports one-time programmability and retains configurations across power cycles without external memory.

Key Specifications

Pinout & Package

24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad. Pin assignments validated per Cypress Document 001-13196 Rev. *I (CY2545 variant).

Key Features

Applications

Equivalent & Alternatives

CY2545QC022T has documented alternatives for design flexibility and supply continuity.

Compared with Si5341-B-GM and ICS8430M-01LFT, CY2545QC022T uniquely balances programmability, EMI control, and ease of integration - offering field-upgradable spread spectrum, dual-config switching, and bank-specific voltage control without external memory or complex toolchains.

Availability

CY2545QC022T is available at Aetrix Electronics and suitable for PC motherboard design, networking switch timing, industrial embedded controller development, and consumer set-top box production requiring stable component supply and long-term lifecycle support.

Supply support for CY2545QC022T 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 programmable system-on-chip (PSoC), memory, and timing solutions for industrial, automotive, and consumer markets.

CY2545QC022T belongs to Cypress's programmable clock generator product line, engineered specifically for EMI-conscious, multi-rail digital systems needing flexible, field-programmable clock synthesis without external configuration memory.

FAQ

What is the maximum output frequency supported by CY2545QC022T?

CY2545QC022T supports output frequencies from 3 MHz to 166 MHz across all eight clock outputs. This range is confirmed in the AC Electrical Specifications section of Cypress Document 001-13196 Rev. *I, with guaranteed operation up to 166 MHz under recommended operating conditions (VDD = 3.3 V, TA = 25°C).

Does CY2545QC022T require an external EEPROM for configuration storage?

No. CY2545QC022T contains on-chip nonvolatile memory that stores two complete configuration sets-including PLL parameters, spread spectrum settings, output dividers, and drive strength-without external components. Configuration persists across power cycles and does not rely on external EEPROM or flash.

Can CY2545QC022T generate different output voltages simultaneously?

Yes. CY2545QC022T supports three independent output voltage banks: Bank1 (CLK1/CLK2) powered by VDD_CLK_B1, Bank2 (CLK3–CLK5) by VDD_CLK_B2, and Bank3 (CLK6–CLK8) by VDD_CLK_B3. Each bank accepts 1.8 V, 2.5 V, 3.0 V, or 3.3 V, enabling true mixed-voltage clock distribution on a single chip.

How is spread spectrum modulation controlled on CY2545QC022T?

Spread spectrum is controlled via the CLK6/SSON pin (pin 15): driving it low disables spread spectrum on PLL3 and PLL4, while driving it high enables it. Modulation type (center/down), depth (±0.125% to ±2.5% or –0.25% to –5.0%), and profile (Lexmark/Linear) are programmed via I²C registers and retained in nonvolatile memory.