Infineon Technologies CY25404ZXI012T

Overview

CY25404ZXI012T from Cypress Semiconductor is a quad-PLL programmable clock generator with nine configurable clock outputs, spread spectrum modulation (SSC), and fractional-N synthesis capability. It supports input frequencies from 8–48 MHz (crystal) or 8–166 MHz (external clock), delivers output frequencies from 3–166 MHz (or 3–50 MHz at 1.8 V), and operates across industrial temperature range (–40°C to +85°C) in a 20-pin TSSOP package. It enables EMI reduction in PC and networking systems via center/down-spread SSC profiles.

For engineers reviewing the CY25404ZXI012T datasheet, CY25404ZXI012T pinout, CY25404ZXI012T application, or CY25404ZXI012T equivalent, key selection criteria include multi-bank independent VDD_CLK supply support (1.8/2.5/3.0/3.3 V), glitch-free frequency switching via FS pins, nonvolatile one-time programming for custom PLL configurations, and dual spread-spectrum PLLs (PLL3/PLL4) with Lexmark/linear modulation profiles.

Technical Context

The CY25404ZXI012T 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 any of five sources (XIN/EXCLKIN, PLL1–PLL4) to be routed to each of nine outputs, with per-bank drive strength and voltage control.

It implements fractional-N synthesis for zero-ppm frequency error, supports three multifunction frequency-select pins (FS0–FS2) for eight preset configurations, and guarantees glitch-free switching via output dividers. The device uses nonvolatile OTP memory to store PLL coefficients, SSC parameters, crystal load capacitance, and bank-specific settings.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (4.4 mm × 6.5 mm, 0.65 mm pitch), RoHS-compliant, industrial-grade moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

Cypress CY25404ZXI012T has two verified functional alternatives with documented compatibility and trade-offs:

Compared with IDT 5P49V5901A and Microchip SY89462L, CY25404ZXI012T uniquely combines OTP-programmable SSC, fractional-N synthesis, and three independent output voltage banks - enabling single-chip EMI-compliant clocking for mixed-voltage, multi-domain systems without external memory or crystal.

Availability

CY25404ZXI012T is available at Aetrix Electronics and suitable for PC motherboard clocking, networking switch ASIC timing, and industrial PLC controller applications requiring stable component supply, long-term lifecycle support, and industrial-temperature grade reliability.

Supply support for CY25404ZXI012T 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 markets.

CY25404 belongs to Cypress's programmable clock generator product line, designed specifically for high-density, multi-clock-domain systems requiring EMI reduction, flexible voltage scaling, and field-configurable timing without external components.

FAQ

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

The maximum output frequency is 50 MHz under 1.8 V VDD_CLK_Bx conditions, as specified in the AC Electrical Specifications table (Page 7). This limitation arises from drive strength and slew rate constraints at lower supply voltages; exceeding 50 MHz risks duty cycle distortion and increased jitter beyond datasheet limits.

Can CY25404ZXI012T generate a 125.000 MHz output with zero ppm error?

Yes. Its fractional-N PLL architecture enables exact frequency synthesis - e.g., 125.000 MHz can be generated with zero ppm error using integer-plus-fractional division ratios stored in OTP memory, eliminating the need for external VCXOs or trimming capacitors.

How does the CLK7/SSON pin function in spread spectrum control mode?

When configured as SSON, CLK7/SSON is a high-true input that globally enables or disables spread spectrum modulation on PLL3 and PLL4. When asserted high, SSC is active; when low, both PLLs operate at nominal frequency. This pin does not affect PLL1 or PLL2, which lack SSC capability.

Is it possible to configure different spread spectrum profiles on PLL3 and PLL4 simultaneously?

No. The CY25404ZXI012T applies identical spread spectrum parameters (center/down-spread percentage, modulation profile) to both PLL3 and PLL4. Profile selection is global and programmed once via OTP; independent modulation per PLL is not supported in this device revision.