Infineon Technologies CY26049ZXC-22

Overview

CY26049ZXC-22 from Cypress Semiconductor is a FailSafe™ PacketClock™ global communications clock generator featuring a fully integrated PLL, DCXO-based primary clock source, 100-MHz CMOS output, ±250 ppm FailSafe lock range, and 3.3V operation - designed for telecom infrastructure requiring continuous glitch-free timing during reference failure.

For engineers reviewing the CY26049ZXC-22 datasheet, CY26049ZXC-22 pinout, CY26049ZXC-22 application, or CY26049ZXC-22 equivalent, key selection factors include FailSafe status reporting via SAFE pin, crystal-pullable 10-MHz XIN/XOUT interface, 250 ps peak-to-peak jitter at 100 MHz, and TSSOP-16 package compatibility with commercial-temperature telecom timing designs.

Technical Context

The CY26049ZXC-22 implements a digital-controlled crystal oscillator (DCXO) as its primary clock source, synchronized to an external 10-MHz reference (ICLK) only when within ±250 ppm pull range; upon reference loss, it holds last valid frequency without interruption. Its PLL architecture eliminates external loop filter components and enables automatic resynchronization when ICLK returns.

Output CLKA delivers 100 MHz with 45–55% duty cycle, 0.8–2 V/ns edge rates, and guaranteed 3 ms PLL lock time. The SAFE pin provides real-time status of reference validity, enabling system-level failover decisions in packet-switched network timing applications.

Key Specifications

Pinout & Package

Package: 16-lead TSSOP (6.5 mm × 4.4 mm × 1.1 mm), JEDEC MO-153 compliant, lead-free, commercial temperature grade (0°C to +70°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FailSafe clock generator applications.

Compared with Si5338A-D-GM and ICS8430I-01LFT, the CY26049ZXC-22 uniquely integrates DCXO-based holdover, hardware SAFE signaling, and crystal-pullable operation - making it the sole option among the three that delivers autonomous, zero-software-intervention timing resilience in telecom-grade applications.

Availability

CY26049ZXC-22 is available at Aetrix Electronics and suitable for SONET/SDH line cards, packet-switched network timing modules, and wireless base station fronthaul timing applications requiring stable component supply and long-term lifecycle support.

Supply support for CY26049ZXC-22 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 fabless semiconductor company specializing in high-performance timing, memory, and programmable solutions for communications and industrial markets.

The CY26049 product line was engineered specifically for global communications infrastructure, delivering FailSafe timing resilience in telecom-grade clock generation with minimal external components and deterministic holdover behavior.

FAQ

What is the function of the SAFE pin on the CY26049ZXC-22?

The SAFE pin is an active-high, open-drain output indicating reference clock health: it asserts HIGH when the 10-MHz ICLK input is within ±250 ppm of nominal and phase-aligned; it drives LOW during reference loss or excessive drift. This signal enables external logic to initiate failover without software polling or complex monitoring circuits.

Can the CY26049ZXC-22 operate without an external crystal or reference clock?

No - the device requires either a 10-MHz external reference clock applied to ICLK or a 10-MHz pullable crystal connected between XIN and XOUT. It cannot generate clock output autonomously without one of these inputs; however, once locked, it sustains 100-MHz output via DCXO during reference interruption.

What crystal specifications must be met for reliable XIN/XOUT operation?

The crystal must be a 10-MHz AT-cut fundamental-mode device with nominal load capacitance of 14 pF, equivalent series resistance ≤25 Ω, drive level 0.5–2 mW, and shunt capacitance ≤7 pF. Cypress specifies FNOM = 10 MHz, CLNOM = 14 pF, and R1 ≤ 25 Ω as mandatory for guaranteed FailSafe lock range and jitter performance.

Is the CY26049ZXC-22 pin-compatible with other members of the CY26049 family?

Yes - all CY26049 variants (e.g., CY26049ZXC-11, -22, -33) share identical 16-pin TSSOP packaging, pinout, and DCXO/PLL architecture; only output frequency and lock range differ. Hardware design reuse is supported across the family, with configuration determined by internal factory programming.