Infineon Technologies CY22394FXCT

Overview

CY22394FXCT from Infineon Technologies (formerly Cypress) is a three-PLL, serial- and flash-programmable clock generator in 16-pin TSSOP. It delivers one LVPECL output (100–400 MHz) and four CMOS outputs (up to 200 MHz), with ultra-wide P/Q/post-dividers (11-bit P, 8-bit Q, 7-bit post), digital VCXO capability, and field-programmable configuration via two-wire serial interface. Used in high-speed communications and FPGA timing systems requiring multiple synchronized clocks.

For engineers reviewing the CY22394FXCT datasheet, CY22394FXCT pinout, CY22394FXCT application, or CY22394FXCT equivalent, key selection criteria include its 100–400 MHz LVPECL output range, 3.3 V operation, glitch-free S2-controlled frequency switching, programmable crystal load capacitance (6–30 pF), and support for in-system reconfiguration without external hardware changes.

Technical Context

The CY22394FXCT integrates three independent PLLs-each with fully programmable 11-bit P and 8-bit Q dividers-feeding a 4×4 crosspoint switch that routes signals to five configurable outputs. PLL1 drives both the PECL output and CLKE via a /2-/3-/4 synchronous post-divider; PLL2 and PLL3 feed only the switch matrix.

It supports dual-mode crystal drive (programmable strength, 6–30 pF on-die load caps) and external driven reference inputs up to 166 MHz. Frequency selection uses three LVTTL inputs (S0/S1/S2), enabling eight preloaded configurations with glitch-free transitions, while the two-wire serial interface allows runtime register updates and nonvolatile flash programming.

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

CY22394FXCT has two verified drop-in alternatives with documented functional trade-offs:

Compared with Si5338A-D-GM and CY22395FXCT, CY22394FXCT uniquely provides native 100–400 MHz LVPECL output in a flash-programmable, three-PLL architecture - making it irreplaceable in legacy PECL-based infrastructure and high-speed serial link timing where level-shifting adds noise or complexity.

Availability

CY22394FXCT is available at Aetrix Electronics and suitable for high-speed FPGA clocking, optical transceiver timing, industrial Ethernet switches, and ATE clock synthesis requiring stable component supply and long-term lifecycle support.

Supply support for CY22394FXCT 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, documentation, and support for the former Cypress clock portfolio including the CY2239x family.

The CY22394 belongs to Infineon's programmable clock generator product line, designed specifically for applications demanding flexible multi-frequency synthesis from a single crystal source - especially in communications infrastructure, test equipment, and FPGA-based systems.

FAQ

What is the maximum LVPECL output frequency supported by CY22394FXCT?

CY22394FXCT supports LVPECL output frequencies from 100 MHz to 400 MHz, as confirmed in the official Infineon datasheet (Document No. 38-07186 Rev. *N, Page 20). This range is achieved using PLL1's 11-bit P-divider and internal post-processing; operation above 400 MHz is not supported and may violate AC timing specifications.

Can CY22394FXCT operate with an externally driven reference clock instead of a crystal?

Yes - CY22394FXCT accepts 1–166 MHz externally driven reference clocks on XTALIN. When doing so, XTALOUT must be left unconnected (floating), and the internal crystal oscillator is disabled. The device retains full PLL programmability and output configuration capabilities under driven-clock operation.

Does CY22394FXCT support in-system programming without removing the part from the PCB?

Yes - CY22394FXCT supports in-system serial programming via its two-wire SDAT/SCLK interface. Configuration registers can be updated dynamically during operation, and flash memory can be reprogrammed using an external programmer (e.g., Cypress CY3672) while soldered on-board, provided proper voltage and timing conditions are met.

Is the 16-pin TSSOP package of CY22394FXCT RoHS-compliant and lead-free?

Yes - CY22394FXCT uses a RoHS-compliant 16-pin TSSOP package with NiPdAu lead finish, as specified in the Infineon ordering information (Page 20, Document 38-07186 Rev. *N). It meets JEDEC J-STD-020 moisture sensitivity level 3 and is compatible with standard lead-free reflow profiles.