Infineon Technologies CY25701FLXIT

Overview

CY25701FLXIT from Cypress Semiconductor is a programmable high-frequency crystal oscillator with selectable spread spectrum (SSXO) or no-spread (XO) operation, delivering 10–166 MHz output clock signals with ±0.25% to ±2.0% center spread or –0.5% to –4.0% down spread, 3.3 V supply, and industrial temperature range (–40 °C to +85 °C), used for EMI reduction in PC motherboard clock trees.

For engineers reviewing the CY25701FLXIT datasheet, CY25701FLXIT pinout, CY25701FLXIT application, or CY25701FLXIT equivalent, key selection criteria include programmable spread percentage, 85 ps cycle-to-cycle jitter at 133 MHz, OE-controlled output enable/disable timing, 4-pin ceramic LCC package compatibility, and factory/field programming flexibility via CY3672-USB kit.

Technical Context

The CY25701FLXIT integrates a proprietary PLL to synthesize output frequencies from an embedded crystal, supporting both SSXO and XO modes via nonvolatile configuration memory. Spread modulation is fixed at 31.5 kHz nominal (30.1–32.9 kHz selectable), with programmable spread percentages mapped to discrete codes (e.g., Code A = ±0.25%, Code G = –0.5%).

It operates exclusively from a 3.3 V supply (3.0–3.6 V range), delivers CMOS-compatible output drive (12 mA source/sink), and features asynchronous OE control with 150–350 ns enable/disable delays. Output duty cycle is tightly controlled (45–55%) and load capacitance is specified up to 15 pF.

Key Specifications

Pinout & Package

Package: 4-pin ceramic leadless chip carrier (LCC), surface-mount, Pb-free, 5.0 × 3.2 mm footprint, industrial-grade thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable oscillator applications.

Compared with Si5351A-B-GM and ICS843001AGI-01LFT, CY25701FLXIT uniquely combines embedded crystal, field-programmable spread control, and industrial temperature rating in a single-output 4-pin LCC-making it optimal for EMI-constrained, single-rail embedded clocking where simplicity and qualification assurance are critical.

Availability

CY25701FLXIT is available at Aetrix Electronics and suitable for PC motherboard design, industrial PLC timing, and network switch clocking requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.

Supply support for CY25701FLXIT 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 timing, memory, and programmable logic solutions for embedded systems, with global R&D and manufacturing infrastructure.

The CY25701 product line targets EMI-sensitive digital systems requiring certified, programmable clock sources-emphasizing ease of integration, regulatory compliance acceleration, and field configurability without hardware redesign.

FAQ

What is the default spread spectrum setting for CY25701FLXIT?

The device ships unprogrammed; no default spread is preloaded. Factory or field programming is required to set spread percentage (e.g., ±0.5%, –2.0%) or select XO mode (±0.0%). Programming uses CY3672-USB kit and CyberClocks™ software, with configuration stored in on-chip nonvolatile memory.

Can CY25701FLXIT operate at 2.5 V?

No. CY25701FLXIT is specified only for 3.3 V operation (3.0–3.6 V range). Operation below 3.0 V violates absolute maximum ratings and may cause PLL unlock, output instability, or permanent configuration corruption. A dedicated 3.3 V LDO or regulator rail is mandatory.

Is the SSCLK output edge-aligned or phase-aligned across spread modulation cycles?

The SSCLK output maintains consistent phase alignment relative to the internal PLL reference; modulation introduces controlled frequency deviation but preserves edge monotonicity and duty cycle stability (45–55%). No phase discontinuities or glitches occur during spread transitions-verified per AC Electrical Characteristics Table on page 5.

Does CY25701FLXIT require external passive components for basic operation?

Only a 0.1 µF ceramic decoupling capacitor between VDD and VSS is required. No external crystal, loop filter, or termination resistors are needed-the oscillator is fully self-contained. Layout best practice mandates placing the capacitor within 2 mm of pins 2 and 4 to maintain jitter performance.