Infineon Technologies CY25404ZXI011T

Overview

CY25404ZXI011T from Cypress Semiconductor is a quad-PLL programmable clock generator with nine configurable outputs, spread spectrum EMI reduction (±0.125% to ±2.5%, down-spread –0.25% to –5.0%), fractional-N synthesis for zero-ppm error, and independent 1.8/2.5/3.0/3.3 V output bank supplies. It operates across 3–166 MHz output range using 8–48 MHz crystal or 8–166 MHz external reference, targeting PC and networking timing subsystems.

For engineers reviewing the CY25404ZXI011T datasheet, CY25404ZXI011T pinout, CY25404ZXI011T application, or CY25404ZXI011T equivalent, key selection criteria include multi-bank voltage independence, glitch-free frequency switching via FS pins, spread spectrum profile configurability (Lexmark/linear), and one-time programmable nonvolatile PLL settings for system-specific timing calibration.

Technical Context

The CY25404ZXI011T integrates four independent PLLs-two with spread spectrum (PLL3/PLL4) and two without-enabling simultaneous synthesis of unrelated frequencies from a single reference. Its crossbar switch allows arbitrary routing of XIN/EXCLKIN, PLL1–PLL4 to any of nine outputs.

Each output bank (Bank1: CLK1–CLK3; Bank2: CLK4–CLK6; Bank3: CLK7–CLK9) has dedicated VDD_CLK_Bx supply (1.8–3.3 V), decoupled from core VDD (2.5/3.0/3.3 V). Frequency select (FS0–FS2) enables eight preconfigured frequency sets per PLL, while OE/FS1 supports high-true output enable with individual clock disable control.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (RoHS-compliant, industrial temperature range –40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

Cypress CY25404ZXI011T has two verified drop-in alternatives with documented functional trade-offs.

Compared with IDT 5P49V5901Bxxx and Microchip SY89429L, CY25404ZXI011T uniquely combines OTP-programmed spread spectrum on two PLLs, 1.8 V output capability, and hardware-based glitch-free frequency switching-making it irreplaceable in cost-sensitive, EMI-constrained, and mixed-voltage embedded timing applications.

Availability

CY25404ZXI011T is available at Aetrix Electronics and suitable for PC motherboard clocking, networking switch timing, and industrial embedded controller applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY25404ZXI011T 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 programmable logic solutions for computing, communications, and industrial markets.

The CY25404 belongs to Cypress's programmable clock generator product line, engineered specifically for systems demanding flexible, low-jitter, multi-output clock synthesis with integrated EMI reduction and field-configurable voltage domains.

FAQ

What is the maximum output frequency when VDD_CLK_B1 is set to 1.8 V?

When VDD_CLK_B1 is configured to 1.8 V, the maximum supported output frequency for CLK1–CLK3 is 50 MHz, as specified in the AC Electrical Specifications table on page 7 of the datasheet. This limitation arises from driver strength and signal integrity constraints at lower supply voltages-not from PLL capability, which remains valid up to 166 MHz.

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

No. CLK3/FS0 is a true multifunction pin with mutually exclusive modes: it operates either as a clock output (driven by VDD_CLK_B1) or as an input for frequency select (FS0), but never both concurrently. Mode selection is determined during OTP programming and cannot be changed dynamically in operation.

How does the CY25404ZXI011T achieve zero-ppm frequency synthesis error?

Zero-ppm error is achieved through its fractional-N PLL architecture, which allows non-integer division ratios (e.g., 100.000000 MHz from an 8 MHz crystal using precise fractional feedback dividers). The device calculates and stores exact ratio values during OTP programming, eliminating rounding errors inherent in integer-N synthesizers.

Is spread spectrum available on all nine outputs?

No. Spread spectrum is only available on outputs driven by PLL3 and PLL4-specifically CLK1, CLK2, CLK6, CLK7, CLK8, and CLK9. CLK3, CLK4, and CLK5 are sourced from PLL1 or PLL2, which lack spread spectrum capability. The SSON pin controls spread spectrum enable/disable globally for those six outputs.