Infineon Technologies CY22801KSXC-011T

Overview

CY22801KSXC-011T from Cypress Semiconductor is a flash-programmable universal clock generator with integrated PLL, supporting three LVCMOS clock outputs up to 200 MHz (commercial grade), spread spectrum modulation (±0.25–±2.5%), and VCXO tuning. It accepts 8–30 MHz crystal or 1–133 MHz external clock input, operates at 3.3 V, and is housed in an 8-pin SOIC package for embedded timing control in communications and consumer electronics.

For engineers reviewing the CY22801KSXC-011T datasheet, CY22801KSXC-011T pinout, CY22801KSXC-011T application, or CY22801KSXC-011T equivalent, key selection criteria include I²C-programmable output frequencies, VCXO analog voltage control on Pin 3, spread spectrum enable/disable via multifunction pins, and compatibility with CyClocksRT™ configuration software for JEDEC file generation.

Technical Context

The CY22801KSXC-011T implements a proprietary Cypress PLL architecture with dual programmable dividers (P/Q counters) and two post-dividers (DIV1N/DIV2N), enabling frequency synthesis from a single reference source. Its switch matrix routes either the PLL output, direct reference clock, or divided reference to any of three outputs.

Pin 3 (SDAT/FS0/VCXO/OE/PD#) and Pins 5 & 7 (CLKB/FS1/SCLK and CLKC/FS2) are multifunction terminals supporting configurable roles including serial interface (I²C address 0x69), frequency select, output enable, power-down, and VCXO analog tuning - with mutual exclusions enforced (e.g., VCXO disabled when I²C or spread spectrum active).

Key Specifications

Pinout & Package

Package: 8-pin Small Outline Integrated Circuit (SOIC), surface-mount, JEDEC MS-012AC compliant, 150 mil body width.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar universal clock generator applications.

Compared with IDT5V41066PGG and Si5351A-B-GM, the CY22801KSXC-011T uniquely integrates crystal oscillator circuitry, VCXO analog tuning, and spread spectrum in a single 8-pin SOIC - offering lowest component count for EMI-compliant, synchronizable clocking in space-constrained consumer and industrial designs.

Availability

CY22801KSXC-011T is available at Aetrix Electronics and suitable for PCI Express timing, set-top box reference clocking, industrial PLC backplane sync, and USB 2.0 hub controller clocking requiring stable component supply and long-term manufacturability.

Supply support for CY22801KSXC-011T 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 embedded applications.

The CY22801 belongs to Cypress's Universal Programmable Clock Generator (UPCG) product line, designed specifically for flexible, low-jitter clock synthesis in cost-sensitive, EMI-regulated consumer and communications equipment where field programmability and analog synchronization are critical.

FAQ

What is the default state of CY22801KSXC-011T after power-up?

At power-on, unprogrammed CY22801KSXC-011T defaults to all outputs tristated, crystal oscillator active, and all registers set to zero. No clock outputs are enabled until programmed via I²C or pre-flashed with a JEDEC file. This safe-start behavior prevents unintended clock injection into downstream logic during power sequencing.

Can VCXO and spread spectrum features operate simultaneously?

No. VCXO and spread spectrum are mutually exclusive features in the CY22801KSXC-011T. Enabling VCXO disables spread spectrum functionality, and vice versa. This hardware-level restriction is enforced by internal logic to prevent conflicting modulation schemes that would degrade jitter performance or destabilize the PLL lock.

How is the crystal load capacitance configured?

Crystal load capacitance is set via an 8-bit register controlling on-die parallel-plate capacitors. The total effective load (CapLoad) is calculated as (CL – CBRD – CCHIP) / 0.09375 pF, where CL is user-entered crystal spec in CyClocksRT™. The tool auto-computes CapLoad and programs it - eliminating manual capacitor selection and board-level tuning.

What happens to I²C-programmed settings during power cycle?

I²C programming is volatile: all register values reset to their nonvolatile JEDEC-programmed defaults (or zero if unprogrammed) upon power-down. To retain custom I²C configurations across cycles, the host processor must reissue the full register write sequence at boot - or use CyClocksRT™ to fuse JEDEC settings permanently into flash memory.