Infineon Technologies CY25560SXIT

Overview

CY25560SXIT from Infineon Technologies (formerly Cypress) is a spread spectrum clock generator (SSCG) IC that synthesizes and frequency-modulates reference clocks to reduce electromagnetic interference in high-speed digital systems. It operates from 25 MHz to 100 MHz, supports nine center-spread modulation options via tri-level S0/S1 control, delivers ≤300 ps cycle-to-cycle jitter, and consumes 56–139 mW depending on input frequency. It is used in VGA controllers and LCD monitor timing circuits.

For engineers reviewing the CY25560SXIT datasheet, CY25560SXIT pinout, CY25560SXIT application, or CY25560SXIT equivalent, key selection criteria include its fixed 1166 internal divider count, tri-level logic interface for spread% programming, center-spread modulation profile, and SOIC-8 packaging with commercial/industrial temperature support.

Technical Context

The CY25560SXIT implements a proprietary PLL-based architecture with integrated loop filter and VCO, enabling precise center-spread frequency modulation over a 25–100 MHz input range. Its modulation rate is determined by Fin and a fixed internal divider of 1166, yielding deterministic sweep profiles without external components.

Tri-level logic on S0 and S1 pins (supporting High/Middle/Low states) enables nine discrete spread% selections-e.g., 4.3% at 25–35 MHz (S1=M, S0=M) down to 1.0% at 80–100 MHz (S1=M, S0=1). The SSCC pin provides hardware-level enable/disable of spread modulation for EMI test comparison.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), 1.27 mm pitch, RoHS-compliant, rated for 0 °C to 70 °C (Commercial) and –40 °C to 85 °C (Industrial) operation.

Key Features

Applications

Equivalent & Alternatives

Two validated alternatives exist for CY25560SXIT with documented functional overlap and measurable differences in spread control, package, and modulation architecture.

Compared with IDT 8T49N241 and NB3N502, CY25560SXIT uniquely balances hardware simplicity (tri-level/no firmware), deterministic modulation (fixed 1166 divider), and fine-grained EMI tuning (nine spread options), making it optimal for cost-sensitive, fixed-function display and PC peripheral designs.

Availability

CY25560SXIT is available at Aetrix Electronics and suitable for desktop PCs, LCD monitors, and printer MFPs requiring stable component supply with long-term industrial temperature support and EMI-compliant clock generation.

Supply support for CY25560SXIT 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 legacy Cypress timing devices including the CY25560 series.

The CY25560 belongs to Infineon's spread spectrum clock generator product line, designed specifically to reduce radiated emissions in display interfaces, PC peripherals, and consumer electronics without compromising timing accuracy or requiring system-level redesign.

FAQ

What is the maximum allowable input clock duty cycle for CY25560SXIT?

The CY25560SXIT specifies an input clock duty cycle range of 25% to 75% at the XIN/CLK pin (Pin 1). Operation outside this range may degrade jitter performance or cause PLL lock failure. This tolerance accommodates common crystal oscillator outputs and CMOS clock buffers with minor asymmetry, but excludes highly distorted or clipped waveforms.

Can CY25560SXIT drive a 50 pF load on SSCLK?

No - the CY25560SXIT is characterized for CL = 15 pF on SSCLK (Pin 4). Driving 50 pF exceeds its specified capacitive load limit and will increase rise/fall times beyond 2.8 ns, raise cycle-to-cycle jitter, and potentially destabilize downstream timing. Use a buffer IC if higher capacitance loads are required.

How does the internal tri-level resistor divider work on S0 and S1?

Each of S0 (Pin 7) and S1 (Pin 6) contains two 20 kΩ internal resistors forming a voltage divider between VDD and VSS, producing a nominal 1.65 V midpoint. With VDD = 3.3 V, this falls within the defined VIM range (1.32–1.98 V), establishing the default 'M' logic state when pins are left unconnected - eliminating external bias components.

Is XOUT pin required when using an external clock on XIN/CLK?

No - XOUT (Pin 8) must be left unconnected (NC) when driving the device with an external clock signal on XIN/CLK (Pin 1). Connecting XOUT in external-clock mode creates unintended feedback paths and may cause oscillation or excessive current draw. XOUT is only used when a crystal is connected between XIN/CLK and XOUT.