Infineon Technologies CY29772AXI

Overview

CY29772AXI from Cypress Semiconductor is a 200-MHz, 12-output zero-delay clock buffer with integrated PLL, crystal oscillator, and three independent output banks (A/B/C) supporting programmable division ratios from 1:1 to 8:1. It operates at 2.5V or 3.3V, delivers ±2% duty cycle variation, 7 ps RMS cycle-to-cycle jitter, and 300 ps max output-output skew across banks. Used in high-speed FPGA/ASIC clock distribution where phase alignment and low-jitter fanout are critical.

For engineers reviewing the CY29772AXI datasheet, CY29772AXI pinout, CY29772AXI application, or CY29772AXI equivalent, this device supports multi-rail clock synthesis with split VDDQA/VDDQB/VDDQC supplies, PLL bypass mode for static operation, Spread Aware™ jitter management, and synchronous pulse generation for system-level timing coordination.

Technical Context

The CY29772AXI implements a fully integrated PLL with VCO frequency range of 200–500 MHz (3.3V) or 200–380 MHz (2.5V), configurable via FB_SEL[2:0] and VCO_SEL to support input frequencies from 6.25 MHz to 125 MHz. Feedback path uses FB_IN/FB_OUT loopback with divider options from ÷4 to ÷40.

Three independent 4-output banks (QA/QB/QC) are each controlled by dual-bit SEL inputs (SELA/B/C[1:0]) and share a common VCO source. Bank-specific division ratios include ÷2, ÷4, ÷6, ÷8, ÷10, ÷12, ÷16, ÷20, ÷24, and ÷32 - enabling non-integer output relationships while maintaining sub-100 ps intra-bank skew.

Key Specifications

Pinout & Package

52-pin 1.0-mm TQFP package with exposed thermal pad (RoHS-compliant, industrial temperature range –40°C to +85°C). Power supply pins are segregated per bank (VDDQA/VDDQB/VDDQC) and PLL core (AVDD), with dedicated analog ground (AVSS) and common grounds (VSS).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-delay clock buffer applications.

Compared with NB3N502DG and SY89873L, the CY29772AXI uniquely combines 12 programmable outputs, integrated crystal oscillator, split-voltage rail support, and hardware SYNC generation - making it the only option for complex, multi-domain, mixed-voltage clock distribution requiring deterministic phase alignment.

Availability

CY29772AXI is available at Aetrix Electronics and suitable for FPGA clock distribution, ASIC timing subsystems, DDR memory interfaces, and multi-processor synchronization requiring stable component supply and long-term industrial-grade availability.

Supply support for CY29772AXI 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) is a U.S.-based semiconductor company specializing in high-performance timing, memory, and programmable logic solutions for industrial, automotive, and communications markets.

The CY29772AXI belongs to Cypress's Zero-Delay Buffer product line, designed specifically for high-speed digital systems requiring ultra-low skew, jitter-controlled clock fanout, and flexible multi-rail clock synthesis in space-constrained PCB environments.

FAQ

What is the function of the SYNC output on CY29772AXI?

The SYNC output generates a one-cycle low pulse one period before coincident rising edges of QA and QC bank clocks. It is automatically derived from internal phase monitoring and used for system-level synchronization across asynchronous clock domains - eliminating need for external logic or software coordination.

Can CY29772AXI operate without an external crystal?

Yes. The device supports two LVCMOS reference inputs (TCLK0/TCLK1) and can bypass the internal crystal oscillator using REF_SEL and TCLK_SEL controls. When configured for LVCMOS input, XIN/XOUT pins are unused and may be left unconnected or grounded per layout guidelines.

How does the PLL bypass mode affect timing behavior?

In PLL bypass mode (PLL_EN = LOW), the reference clock feeds directly to the output dividers without VCO involvement. This eliminates PLL lock time, reduces jitter to input-source levels, and guarantees deterministic propagation delay (±125 ps) - ideal for fail-safe or boot-time clocking.

What are the power supply requirements for VDDQA, VDDQB, and VDDQC?

VDDQA, VDDQB, and VDDQC must be supplied at either 2.5V or 3.3V (±5%), and their voltage levels must not exceed AVDD or VDD. Each bank's supply must be decoupled with a 0.1-µF capacitor placed within 0.2 inches of its respective pins to maintain high-frequency noise immunity and signal integrity.