Infineon Technologies CY22801KSXI-026T

Overview

CY22801KSXI-026T from Cypress Semiconductor is a flash-programmable universal clock generator with integrated PLL, supporting three LVCMOS clock outputs up to 200 MHz (commercial grade), 3.3 V operation, and programmable spread spectrum (±0.25%–±2.5%) for EMI reduction - used in consumer audio/video processors and communications baseband subsystems.

For engineers reviewing the CY22801KSXI-026T datasheet, CY22801KSXI-026T pinout, CY22801KSXI-026T application, or CY22801KSXI-026T equivalent, key selection criteria include I²C-configurable output frequencies, VCXO analog tuning capability, multifunction pin assignment flexibility (FS/OE/PD#/SDAT/SCLK), and SOIC-8 package compatibility with legacy clock layout footprints.

Technical Context

The CY22801KSXI-026T implements a proprietary Cypress PLL architecture driving three independently configurable outputs via a crosspoint switch matrix and dual post-dividers (DIV1N/DIV2N). It supports both crystal (8–30 MHz) and external clock (1–133 MHz) reference inputs with programmable oscillator gain and on-die load capacitors.

Its serial interface uses standard I²C protocol (7-bit address 0x69) for volatile in-system programming; VCXO mode (analog voltage-controlled pull range) and spread spectrum modulation (30.1/31.5/32.9 kHz, center/down spread) are mutually exclusive features, each requiring distinct register configuration and pin assignment.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

Cypress CY22801KSXI-026T has two verified drop-in alternatives with documented functional trade-offs:

Compared with IDT 5V41066APF and Silicon Labs Si5351A-B-GM, CY22801KSXI-026T uniquely combines field-programmable PLL, VCXO tuning, and spread spectrum in an 8-pin SOIC - enabling one device to serve multiple clock architectures across prototyping, qualification, and volume production phases.

Availability

CY22801KSXI-026T is available at Aetrix Electronics and suitable for consumer audio/video processor clocking, communications baseband timing, and industrial PLC real-time control requiring stable component supply and long-term lifecycle support.

Supply support for CY22801KSXI-026T 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 systems.

The CY22801 belongs to Cypress's Universal Programmable Clock Generator (UPCG) product line, designed specifically for flexible, low-jitter clock synthesis in cost-sensitive, high-volume consumer and communications applications where field reconfiguration adds design agility.

FAQ

What is the default state of CY22801KSXI-026T at power-up?

At power-up, the unprogrammed CY22801KSXI-026T defaults to all outputs tri-stated, crystal oscillator active, and all registers set to zero. It remains in this state until configured via I²C or programmed with a JEDEC file using CyClocksRT™ software and CY36800 dongle.

Can VCXO and spread spectrum be enabled simultaneously on CY22801KSXI-026T?

No. VCXO and spread spectrum are hardware-excluded features - enabling one disables the other. This is enforced by internal logic to prevent unstable PLL lock conditions and unpredictable EMI behavior, as confirmed in the Rev. *M datasheet Section 4.

How many unique clock frequencies can CY22801KSXI-026T generate simultaneously?

The device generates up to three simultaneous output frequencies (CLKA, CLKB, CLKC), each selectable from seven sources: PLL output, divided PLL output (via DIV1N or DIV2N), reference input, or reference divided by fixed dividers (/2, /3, /4). All outputs derive from the same PLL core, so ratios remain mathematically related.

Is external crystal load capacitance required when using the XIN/XOUT pins?

No. The CY22801KSXI-026T integrates programmable on-die load capacitors (controlled via 8-bit register); external load capacitors are unnecessary. Crystal manufacturer's specified CL value is entered into CyClocksRT™, which calculates and programs the optimal internal capacitance.