Infineon Technologies CY22395FXCT

Overview

CY22395FXCT from Infineon Technologies (formerly Cypress) is a three-PLL, serial- and flash-programmable clock generator in 16-pin TSSOP. It delivers up to five configurable clock outputs-four LVCMOS and one CMOS-with independent 3.3 V or 2.5 V operation, 8–30 MHz crystal input support, and programmable output dividers enabling frequencies up to 200 MHz (3.3 V) or 133 MHz (2.5 V). It serves as a timing source in FPGA-based industrial control systems requiring multi-frequency synchronization.

For engineers reviewing the CY22395FXCT datasheet, CY22395FXCT pinout, CY22395FXCT application, or CY22395FXCT equivalent, key selection criteria include its dual-voltage LVCMOS/CMOS output capability, field-programmable PLLs with 8-bit Q / 11-bit P dividers, digital VCXO function, and S2/SUSPEND-controlled frequency switching without glitches.

Technical Context

The CY22395FXCT integrates three fully independent PLLs, each with an 8-bit Q divider and 11-bit P multiplier, allowing precise synthesis of up to four distinct output frequencies from a single crystal reference. Its 4×4 crosspoint switch routes PLL outputs to five configurable clock pins (CLKC, LCLKA–LCLKD, LCLKE), with dedicated 7-bit post-dividers per output path.

It supports dual-supply operation: AVDD/VDD at 3.3 V for analog/digital core logic and LVDD at either 3.3 V or 2.5 V for low-voltage clock buffers. The crystal oscillator includes digitally adjustable load capacitance (6–30 pF in 0.375 pF steps) and programmable drive strength, enabling stable startup across diverse crystal manufacturers and environmental conditions.

Key Specifications

Pinout & Package

Package: 16-pin TSSOP (4.4 mm × 5.0 mm, 0.65 mm pitch), RoHS-compliant NiPdAu lead finish.

Key Features

Applications

Equivalent & Alternatives

CY22395FXCT is superseded in new designs by Infineon's newer clock generators offering enhanced features; however, two field-compatible alternatives exist for legacy compatibility and supply continuity.

Compared with CY22394FXCT and CY22393FXCT, CY22395FXCT uniquely supports mixed-voltage clock distribution with dedicated LVDD, making it the only option for modern FPGA/SoC platforms requiring both 3.3 V and 2.5 V timing domains from a single device.

Availability

CY22395FXCT is available at Aetrix Electronics and suitable for FPGA timing reference, industrial PLC clocking, medical imaging data acquisition, and test & measurement instrumentation requiring stable component supply across extended product lifecycles.

Supply support for CY22395FXCT 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and maintains full product continuity, technical support, and long-term supply commitment for the former Cypress clock portfolio.

CY22395FXCT belongs to the CY2239x family of programmable clock generators designed specifically for multi-domain, multi-voltage digital systems - especially FPGA, ASIC, and industrial controller applications demanding flexible, field-upgradable timing.

FAQ

What is the function of the LVDD pin on CY22395FXCT?

LVDD (Pin 6) supplies power to the four LVCMOS output buffers (LCLKA–LCLKD and LCLKE). It accepts either 3.3 V or 2.5 V, enabling direct interface with mixed-voltage logic families. Unlike VDD (core digital/analog supply), LVDD is isolated to minimize noise coupling into clock outputs and supports independent voltage scaling for optimal signal integrity.

Can CY22395FXCT operate without a crystal?

Yes - CY22395FXCT accepts a single-ended CMOS clock input (1–166 MHz) on XTALIN (Pin 4) when XTALOUT (Pin 5) is left floating. In this mode, the internal crystal oscillator circuitry is bypassed, and the part uses the external clock as its reference. All PLLs and output dividers remain fully functional and programmable.

How does the S2/SUSPEND pin enable glitch-free frequency switching?

S2/SUSPEND (Pin 15) selects between two preloaded configurations stored in internal registers - one for PLL1 frequency and another for CLKA/CLKB divider values. Hardware logic synchronizes the switch to the next rising edge of the affected clock domain, ensuring zero-cycle phase discontinuity and eliminating metastability or runt pulses during transition.

Is CyClocksRT™ software required for basic operation?

No - CY22395FXCT powers up with factory-default settings and operates immediately with a crystal or external clock. CyClocksRT™ is optional software used for advanced configuration: generating custom PLL/divider values, programming flash memory, simulating jitter, and exporting register bitmaps for production programming via third-party programmers.