Infineon Technologies CY25404ZXI009T

Overview

CY25404ZXI009T from Cypress Semiconductor is a quad-PLL programmable clock generator with nine configurable clock outputs, spread spectrum modulation (SSC), and fractional-N synthesis. It supports input frequencies from 8–48 MHz (crystal) or 8–166 MHz (external clock), delivers output frequencies from 3–166 MHz (or up to 50 MHz at 1.8 V), and operates across industrial temperature range (–40°C to +85°C) in a 20-pin TSSOP package. Used in PC, networking, and portable systems for EMI reduction and multi-frequency clock domain generation.

For engineers reviewing the CY25404ZXI009T datasheet, CY25404ZXI009T pinout, CY25404ZXI009T application, or CY25404ZXI009T equivalent, key selection criteria include PLL count (4), independent bank voltage control (VDD_CLK_B1/B2/B3), SSC center/down spread programmability, glitch-free frequency switching via FS pins, and nonvolatile one-time programming of output dividers, drive strength, and crystal load capacitance.

Technical Context

The CY25404ZXI009T integrates four fully independent PLLs-two with spread spectrum (PLL3/PLL4) and two without-enabling simultaneous synthesis of unrelated frequencies from a single reference. Each PLL drives programmable output dividers feeding nine clock outputs grouped into three voltage-isolated banks (Bank1: CLK1–CLK3; Bank2: CLK4–CLK6; Bank3: CLK7–CLK9).

Its crossbar switch allows arbitrary routing of any PLL or reference clock (XIN/EXCLKIN) to any output, while multifunction pins (e.g., CLK3/FS0, OE/FS1, CLK7/SSON) support frequency select, output enable, and SSC ON/OFF control. Glitch-free switching is achieved via synchronous divider reconfiguration-not PLL relock-ensuring uninterrupted system operation during frequency changes.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (4.4 mm × 6.5 mm, 0.65 mm pitch), RoHS-compliant, industrial temperature grade (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

Cypress CY25404ZXI009T alternatives include devices with comparable quad-PLL architecture, spread spectrum, and banked voltage outputs.

Compared with IDT 8T49N241 and Si5341-B-GM, CY25404ZXI009T offers lower BOM cost, smaller footprint (20-TSSOP), and true one-time programmability-making it optimal for volume PC, consumer, and industrial applications where EMI reduction and mixed-voltage clocking outweigh ultra-low-jitter or JESD204B needs.

Availability

CY25404ZXI009T is available at Aetrix Electronics and suitable for PC motherboard design, networking switch timing, portable SoC interface, and industrial PLC controller applications requiring stable component supply, industrial temperature operation, and long-term lifecycle availability.

Supply support for CY25404ZXI009T 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) designs high-performance timing, memory, and microcontroller solutions for computing, communications, and industrial markets.

CY25404 belongs to Cypress's programmable clock generator product line, engineered specifically for EMI-sensitive, multi-clock-domain systems requiring flexible, nonvolatile frequency synthesis without external configuration memory.

FAQ

What is the maximum output frequency when VDD_CLK_Bx = 1.8 V?

The CY25404ZXI009T supports a maximum output frequency of 50 MHz when any output bank (B1/B2/B3) is powered at 1.8 V, as specified in the AC Electrical Specifications table on page 7 of the datasheet. This limitation ensures signal integrity and drive strength compliance at lower supply voltages.

Can CLK3/FS0 be used simultaneously as an output and frequency select input?

No. CLK3/FS0 is a true multifunction pin but operates in only one mode at a time: either as a clock output (driven by selected PLL or reference) or as a frequency select input (FS0). Mode selection is configured during OTP programming and cannot be dynamically changed in-circuit.

How does the CY25404ZXI009T achieve glitch-free frequency switching?

It uses synchronous reprogramming of output dividers-not PLL relock-to change frequencies. When FS pins trigger a new configuration, all affected outputs transition on the next common clock edge, preventing runt pulses or metastability in downstream logic.

Is spread spectrum available on all nine outputs?

No. Spread spectrum is only available on outputs driven by PLL3 or PLL4 (i.e., CLK1, CLK2, CLK6, CLK7, CLK8, CLK9 per default routing). CLK3, CLK4, and CLK5 are sourced from PLL1 or PLL2 and lack SSC capability unless rerouted via crossbar to PLL3/PLL4 - which is supported but requires OTP configuration.