Infineon Technologies CY5137-1X07I

Overview

CY5137-1X07I from Cypress Semiconductor is a high-performance, field- and factory-programmable fractional-N PLL die optimized for integrated crystal oscillator modules. It delivers four independently selectable differential output frequencies (15 MHz to 2.1 GHz), supports LVPECL/LVDS/CML/HCSL/LVCMOS standards, operates from 1.8 V to 3.3 V, and achieves 150 fs typical integrated jitter (12 kHz–20 MHz) for outputs >150 MHz - deployed in OTN, SONET/SDH, and wireless infrastructure timing systems.

For engineers reviewing the CY5137-1X07I datasheet, CY5137-1X07I pinout, CY5137-1X07I application, or CY5137-1X07I equivalent, key selection criteria include VCXO tunability (±50 ppm to ±275 ppm TPR), I²C programmability (400 kbps, 7-bit address), third-overtone crystal compatibility, and die-level integration with sealed crystal packages.

Technical Context

The CY5137-1X07I implements a fully integrated LC-based fractional-N PLL with on-die VCO, supporting reconfigurable output frequencies via dual-mode control: hardware-selectable FS[1:0] pins (four preset frequencies) and dynamic I²C writes (full 15 MHz–2.1 GHz range). It accepts crystal references in OT3, HFF, LFF, or low-frequency clock input modes.

VCXO functionality is implemented through analog voltage-controlled modulation of the VCO core, with programmable Kv slope, total pull range (TPR), and modulation bandwidth - all stable across –40 °C to +125 °C and independent of supply or process variation. The die includes OTP eFuse memory for persistent configuration and volatile NVMCopy for runtime register access.

Key Specifications

Pinout & Package

DIE package: 919.5955 µm × 1399.4 µm (horizontal × vertical), scribe-defined, bare die intended for flip-chip or wire-bond integration into hermetically sealed oscillator modules (e.g., 2.5×2.0 mm, 3.2×2.5 mm, 5.0×3.2 mm SMD packages).

Key Features

Applications

Equivalent & Alternatives

CY5137-1X07I is a programmable PLL die optimized for oscillator module integration; alternatives must match die-level form factor, VCXO capability, and I²C configurability.

Compared with IDT8T49N242 and Si5341-B-GM, CY5137-1X07I uniquely combines die-level integration, full VCXO programmability, and I²C-based frequency agility - making it the only solution purpose-built for high-volume, high-performance oscillator module manufacturing.

Availability

CY5137-1X07I is available at Aetrix Electronics and suitable for OTN line cards, high-speed data converters, and wireless baseband units requiring stable component supply, long-lifecycle availability, and traceable die sourcing for oscillator module assembly.

Supply support for CY5137-1X07I 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 microcontroller solutions for communications, industrial, and automotive markets, with headquarters in San Jose, CA.

CY51X7 belongs to Cypress's programmable oscillator die product line, engineered specifically for oscillator manufacturers needing customizable, low-jitter PLL cores that integrate seamlessly with MEMS or quartz crystals in miniature sealed packages.

FAQ

Is CY5137-1X07I supplied as a packaged IC or bare die?

CY5137-1X07I is delivered as a bare die (919.6 µm × 1399.4 µm) with aluminum bond pads, intended for flip-chip mounting or wire bonding into hermetically sealed oscillator modules. It is not offered in plastic QFN, SOIC, or other standard IC packages.

What crystal types does CY5137-1X07I support, and what are the required load capacitance ranges?

CY5137-1X07I supports third-overtone (OT3), high-frequency fundamental (HFF), and low-frequency fundamental (LFF) crystals. OT3 crystals require 12 pF load capacitance; HFF crystals require 10–20 pF; LFF crystals require 8–18 pF. Exact values are programmed into OTP during module calibration.

Can the VCXO function operate simultaneously with I²C frequency reprogramming?

Yes - VCXO modulation (via analog VC pin) and I²C-based frequency changes operate independently. The VC input continuously adjusts VCO frequency around the I²C-programmed center frequency, enabling real-time phase alignment or jitter filtering without interrupting communication.

Does CY5137-1X07I require external passive components for PLL loop filtering?

No - the CY5137-1X07I integrates a fully monolithic LC-based VCO and fractional-N PLL with no external loop filter components required. All compensation, charge pump, and divider circuitry is contained within the die, reducing module BOM count and layout sensitivity.