Infineon Technologies CY22801KSXC-155T

Overview

CY22801KSXC-155T from Cypress Semiconductor is a flash-programmable universal clock generator with integrated PLL, supporting three LVCMOS 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 targets consumer and communications timing applications requiring flexible, low-jitter clock synthesis.

For engineers reviewing the CY22801KSXC-155T datasheet, CY22801KSXC-155T pinout, CY22801KSXC-155T application, or CY22801KSXC-155T equivalent, key selection criteria include I²C-configurable output frequencies, VCXO capability (with pullable crystal), multifunction pin assignment (FS/OE/PD#/VCXO/SDAT/SCLK), and compatibility with CyClocksRT™ for JEDEC-based field programming.

Technical Context

The CY22801KSXC-155T implements a proprietary Cypress PLL architecture driving three independently configurable outputs via a crosspoint switch matrix and dual post-dividers (DIV1N/DIV2N). Its reference path supports direct bypass, PLL-derived, or divider-modulated outputs - all derived from either XIN/CLKIN or internal crystal oscillator.

It integrates programmable oscillator gain, on-die load capacitors (8-bit register-controlled), and mutually exclusive operating modes: Spread Spectrum Clock Generation (SSCG) at 30.1/31.5/32.9 kHz modulation, or VCXO control (analog voltage tuning ±200 ppm), but not both simultaneously. Multifunction pins support dynamic reconfiguration of OE, PD#, FS0–FS2, SSON, SDAT, and SCLK per Table 1.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT 5V41066APFGI and ON Semi NB3N3020BDR2G, the CY22801KSXC-155T uniquely combines flash-programmable PLL, integrated crystal oscillator, VCXO, spread spectrum, and I²C reconfigurability in an 8-pin SOIC - making it optimal for prototyping, multi-platform reuse, and EMI-constrained designs where flexibility outweighs unit cost.

Availability

CY22801KSXC-155T is available at Aetrix Electronics and suitable for set-top box timing, network switch PHY clocking, industrial PLC controller, and USB 3.0 hub reference applications requiring stable component supply, long-term lifecycle support, and field-programmable timing solutions.

Supply support for CY22801KSXC-155T 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) designs high-performance mixed-signal ICs for embedded control, connectivity, and timing applications, with global R&D centers and manufacturing partnerships.

The CY22801 belongs to Cypress's Universal Programmable Clock Generator (UPCG) product line, engineered specifically for consumer electronics and communications equipment needing compact, software-configurable, low-EMI clock synthesis without external passive components.

FAQ

What is the default state of CY22801KSXC-155T after power-up?

When unprogrammed, all registers initialize to zero: outputs are tri-stated, crystal oscillator is active, and no spread spectrum or VCXO is enabled. The device remains in this safe, high-impedance state until configured via I²C or programmed with a JEDEC file using CyClocksRT™ and CY36800 dongle.

Can CLKA, CLKB, and CLKC operate at different frequencies simultaneously?

Yes - each output can be assigned independently to REF, PLL/VCO, or one of six post-divider ratios (/2, /3, /4, /DIV1N, /DIV2N, or bypass). However, all outputs derive from the same PLL frequency ((REF × P)/Q), so their frequencies are mathematically related, not fully independent.

Is the CY22801KSXC-155T compatible with standard I²C buses?

Yes - it uses standard two-wire I²C protocol with 7-bit slave address 0x69 (0x69H), supports 100 kHz and 400 kHz modes, and includes internal weak pull-ups (~100 kΩ) on SDAT and SCLK pins. No external pull-up resistors are required for basic communication, though board layout may warrant them.

How does the on-die load capacitor setting affect crystal selection?

The 8-bit register sets total effective load capacitance (CapLoad) using CapLoad = (CL – CBRD – CCHIP) / 0.09375 pF. Users enter crystal CL value in CyClocksRT™; the tool calculates and programs the register to match the crystal's specified load, eliminating manual capacitor selection and improving frequency accuracy across temperature and voltage.