Infineon Technologies CY22801KSXC-021T

Overview

CY22801KSXC-021T 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. It accepts 8–30 MHz crystal or 1–133 MHz external clock input and features VCXO capability for frequency pulling in synchronization-critical systems such as set-top boxes and digital TVs.

For engineers reviewing the CY22801KSXC-021T datasheet, CY22801KSXC-021T pinout, CY22801KSXC-021T application, or CY22801KSXC-021T equivalent, key selection criteria include I²C-configurable output frequencies, multifunction pin assignment (FS/VCXO/OE/PD#/SDAT/SCLK), compatibility of spread spectrum with all outputs simultaneously, and SOIC-8 package constraints for space-constrained timing designs.

Technical Context

The CY22801KSXC-021T implements a proprietary Cypress PLL architecture with dual programmable post-dividers (DIV1N/DIV2N) and direct reference bypass paths, enabling up to three independent output frequencies derived from a single VCO or reference source. Its serial I²C interface (address 0x69) supports volatile in-system reprogramming without requiring external programming hardware.

It integrates on-die programmable load capacitors (8-bit register control) for crystal oscillator tuning, eliminates external capacitors, and supports VCXO analog voltage control (0–3.3 V) for ±100 ppm pull range-though VCXO and spread spectrum are mutually exclusive modes per configuration.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), JEDEC MS-012AC, body size 3.9 mm × 4.9 mm, 1.27 mm pitch, surface-mount.

Key Features

Applications

Equivalent & Alternatives

Cypress CY22801KSXC-021T has two verified functional alternatives with documented trade-offs in programmability, output count, and interface support.

Compared with IDT 5V41066PGG and Silicon Labs Si5351A-B-GM, CY22801KSXC-021T uniquely combines crystal-based VCXO support, I²C reprogrammability, and spread spectrum-all in an SOIC-8 package-making it optimal for mid-volume consumer electronics requiring field-tunable timing.

Availability

CY22801KSXC-021T is available at Aetrix Electronics and suitable for set-top box timing, digital TV audio/video clocking, cable modem upstream sync, and industrial Ethernet switch PHY clocking requiring stable component supply, full traceability, and lifecycle continuity.

Supply support for CY22801KSXC-021T 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 U.S.-based semiconductor company specializing in programmable system-on-chip (PSoC), memory, and timing solutions for industrial, automotive, and consumer applications.

The CY22801 belongs to Cypress's Universal Programmable Clock Generator (UPCG) product line, designed specifically for cost-sensitive, space-constrained consumer electronics requiring field-configurable, low-EMI clock synthesis with crystal-based stability.

FAQ

What is the default state of CY22801KSXC-021T after power-up?

At power-on, unprogrammed CY22801KSXC-021T defaults to all outputs tri-stated, crystal oscillator active, and all registers set to zero. It remains non-functional until configured via I²C or programmed with a JEDEC file. Factory-shipped units are blank; distributors typically pre-program with customer-specific settings.

Can CLKA, CLKB, and CLKC operate at unrelated frequencies?

No. All three outputs derive from either the same PLL VCO frequency or the same reference clock, so their frequencies must be integer-related via programmable dividers. While CLKA may be set to REF/2 and CLKB to (REF×P/Q)/3, they share common base frequencies - true independent synthesis is not supported.

Is spread spectrum compatible with VCXO mode?

No. Spread spectrum and VCXO are mutually exclusive features per the CY22801 datasheet. Enabling VCXO disables spread spectrum functionality, and vice versa. This is enforced in hardware and cannot be overridden through register writes.

How is the crystal load capacitance configured?

Crystal load capacitance is set via an 8-bit register (CapLoad) that controls on-die parallel-plate capacitors. Users enter nominal crystal CL value in CyClocksRT™ software, which calculates CapLoad automatically using CapLoad = (CL – CBRD – CCHIP) / 0.09375 pF and programs it into the device - no external capacitors needed.