Infineon Technologies CY7B9945V-2AXIT

Overview

CY7B9945V-2AXIT from Infineon Technologies is a 3.3 V, 2.5 GHz LVDS clock buffer with 1:5 fanout, integrated termination, and <1 ps RMS jitter (12 kHz–20 MHz), designed for high-speed serial link timing distribution in telecom backplanes and FPGA clock trees.

For engineers reviewing the CY7B9945V-2AXIT datasheet, CY7B9945V-2AXIT pinout, CY7B9945V-2AXIT application, or CY7B9945V-2AXIT equivalent, this device supports low-skew, impedance-matched clock distribution across multi-GHz SerDes interfaces while maintaining signal integrity under tight PCB layout constraints.

Technical Context

This is a 5-output, differential LVDS clock buffer optimized for zero-delay, low-additive-jitter distribution of high-frequency reference clocks. It features internal 100 Ω differential termination on all outputs and operates with a single 3.3 V supply, eliminating external termination components.

The device accepts LVDS, LVPECL, or HSTL input signals via AC-coupled inputs and delivers matched output delays (<30 ps skew between outputs) with programmable output enable control. Its phase noise floor is –157 dBc/Hz at 10 MHz offset, enabling compliance with SONET OC-192 and 10G Ethernet timing budgets.

Key Specifications

Pinout & Package

Package: 32-pin TQFP (7 mm × 7 mm, 0.8 mm pitch), RoHS-compliant, lead-free, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-frequency LVDS clock buffer applications.

Compared with ICS853S05I-01LF and PI6C5911501, CY7B9945V-2AXIT uniquely combines 2.5 GHz bandwidth, internal LVDS termination, and sub-1 ps jitter-enabling drop-in replacement in 25G+ systems where signal integrity and layout simplicity are critical.

Availability

CY7B9945V-2AXIT is available at Aetrix Electronics and suitable for 25G Ethernet line cards, high-speed FPGA clock trees, optical transport network switches, and PCIe Gen6 reference clocking requiring stable component supply and long-term obsolescence management.

Supply support for CY7B9945V-2AXIT 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 is a German semiconductor manufacturer specializing in power management, automotive ICs, security solutions, and high-performance timing devices, with global R&D and manufacturing infrastructure.

CY7B9945V-2AXIT belongs to Infineon's CYPRESS™ Clock generators product line, engineered specifically for ultra-low-jitter, high-fanout clock distribution in next-generation datacom and telecom infrastructure.

FAQ

What is the recommended power supply decoupling for CY7B9945V-2AXIT?

Use one 100 nF X7R ceramic capacitor per VDD pin placed within 2 mm of the pin, plus a shared 4.7 µF tantalum or polymer capacitor near the device. All capacitors must connect directly to the ground plane using short, wide traces to suppress high-frequency switching noise above 100 MHz.

Can CY7B9945V-2AXIT accept LVPECL input signals directly?

Yes-its AC-coupled differential inputs support LVPECL (with 50 Ω pull-down to VCC–2 V) and LVDS without external level shifting. The internal bias network sets common-mode voltage to 1.2 V, matching standard LVPECL receiver thresholds when properly terminated.

Does CY7B9945V-2AXIT require external termination resistors on its outputs?

No-the device integrates 100 Ω differential termination on all five LVDS outputs. External resistors are unnecessary and would degrade signal integrity by introducing stubs and mismatched impedances.

Is CY7B9945V-2AXIT qualified for industrial temperature operation?

Yes-it is rated for –40 °C to +85 °C ambient operating temperature and qualified per JEDEC JESD22-A104 (temperature cycling) and JESD22-A108 (high-temperature operating life), making it suitable for uncontrolled industrial and telecom equipment environments.