Infineon Technologies CY22393FXET

Product Summary

The CY22393FXET automotive clock generator from Infineon Technologies is a highly integrated timing device designed to meet the demanding requirements of modern automotive and industrial electronics. Featuring three independent,

Principal Characteristics of the CY22393FXET Automotive Clock Generator

The CY22393FXET is engineered for flexibility, robustness, and ease of integration. Key features include:

Three fully programmable PLLs for multiple independent frequency outputs.

Ultra-wide programmable divide counters: 8-bit Q, 11-bit P, and 7-bit post dividers.

Field and flash configurability for flexible deployment and rapid prototyping.

Low-jitter, high-accuracy clock outputs suitable for timing-critical applications.

Advanced power management modes: Shutdown, Output Enable (OE), Suspend.

Configurable crystal drive strength to accommodate a broad array of crystal types.

Frequency selection via three external LVTTL-compatible inputs.

Digital VCXO (Voltage-Controlled Crystal Oscillator) capability for fine frequency tuning.

2-wire serial interface for in-system configuration and dynamic updates.

On-die linear crystal load capacitors for improved frequency stability.

CyClocksRT™ software support for configuration and validation.

Automotive-grade reliability (AEC-Q100).

3 V single-supply operation.

These features make the CY22393FXET particularly well-suited for automotive, industrial, and consumer applications requiring precise and customizable timing sources.

Functional Design and Block Diagram of the CY22393FXET

At the core of the CY22393FXET lies a sophisticated architecture that leverages multiple PLLs and a programmable logic fabric to generate up to four independent clock frequencies routed to six output pins. The device integrates three PLL blocks, cross-point switching, configurable post dividers, a crystal oscillator interface, and robust power management circuits.

This block structure allows designers to leverage a single reference clock or crystal while deriving clocks at different frequencies for microcontrollers, communications modules, or display units. The flexibility of the CY22393FXET can reduce system BOM costs and design complexity by consolidating timing sources.

Configurable Phase-Locked Loop (PLL) Technology

The CY22393FXET’s three PLLs are central to its timing versatility. Each PLL generates frequencies based on the formula:

F_PLL = F_REF × (P_T / Q_T),

where P_T and Q_T are programmable counters.

PLL1 output: Frequency derived from the reference via 8-bit Q, 11-bit P counters; supports dynamic selection and glitch-free switching through external control or serial programming.

PLL2/PLL3 outputs: Similarly programmable, used for generating separate frequencies routed to different output pins.

Each PLL can feed its output through a cross-point switch and further to post-dividers, enabling a wide range of output frequencies. This flexibility makes the device appropriate for applications where clocks of varying frequency and phase are required, such as for multi-domain synchronization in automotive ECUs or infotainment systems.

Multi-purpose Inputs and Frequency Selection Options

The CY22393FXET features three general-purpose LVTTL-compatible inputs (S0, S1, S2), used as dynamic frequency selectors. These inputs allow up to eight frequency states to be selected at runtime, modifying PLL divider settings and output post-dividers without system glitches.

S2 configures two distinct sets of PLL1, CLKA, and CLKB values.

S0/S1 are latched at startup and, together with S2, create an indexed array for frequency selection.

This capability is valuable in systems that require switching clock sources in response to operating modes, such as sleep, idle, or full-performance states.

Crystal Oscillator Input and Drive Setup

The device supports both crystal-based and driven reference clock inputs. Its input oscillator inverter includes programmable drive strength—for maximum compatibility—and on-die linear load capacitors (6pF to 30pF adjustable in 0.375pF steps). This design optimizes absolute frequency stability under changing environmental and load conditions.

Parallel resonant, fundamental-mode crystals are recommended.

For driven clock applications up to 166MHz, the internal load capacitors can be bypassed, and the oscillator output pin left floating.

In select scenarios, such as networking equipment or audio subsystems, this configurability reduces external component requirements and enhances system reliability.

Output Arrangement and Signal Routing in the CY22393FXET

The CY22393FXET provides up to five output clocks (CLKA, CLKB, CLKC, CLKD, CLKE) plus a buffered reference output (XBUF). Outputs are routed through a programmable cross-point switch and 7-bit post-dividers, allowing for precise per-output frequency scaling.

Each of CLKA, CLKB, CLKC, and CLKD uses a 7-bit divider, supporting dynamic changes via register switching.

CLKE is derived from PLL1 with a programmable /2, /3, /4 post-divider.

Output drive strength and duty cycle adjustments are available, enabling optimal signal integrity for different load scenarios.

It is recommended to drive a single-point load of up to 15pF per output, with appropriate termination for multi-load cases.

Power Regulation and Energy Saving Features

Advanced power management features minimize energy consumption in complex systems:

Shutdown/OE pin: Tristates outputs and can fully shut down the PLLs, oscillator, and logic for <5mA standby current.

Suspend (S2): Selectively disables any combination of PLLs and outputs, forcing tristate or full logic shutoff.

Serial interface: Allows granular individual PLL/output disable, facilitating custom power optimization strategies.

These controls are important for automotive systems that require low power draw in sleep or standby modes while maintaining fast wake-time performance.

Digital VCXO Capabilities

The digital VCXO feature permits fine tuning of the reference frequency by dynamically adjusting on-die crystal load capacitance via the serial interface. With pullable crystals, typical pull range is ±150 ppm. All PLL-generated outputs follow the reference frequency change, enabling dynamic system tuning, for instance, in wireless communications modules that require quick frequency tracking.

Serial Interface Programming and Customization

Configuration and reprogramming are streamlined through a 2-wire serial interface (compatible with I²C timing except for data hold time). The device supports:

In-system updates with serial programming up to 400 kbps.

Field programmability (for CY22393F-series) and factory-programmed variants.

Multiple programming modes: single-byte, multi-byte, and multi-device operation.

Programmable device addresses for independent control across multiple clock generators.

CyClocksRT™ software is integral for programming and validation. It automatically calculates valid internal settings based on user frequency requirements, and assists with power estimation, jitter optimization, and configuration file generation (.jed format).

Electrical Properties and Reliability Standards for Automotive Applications

The CY22393FXET is rated for automotive operation, ensuring robust performance:

Supply voltage: 3.3V typical, with operating range specified.

Absolute maximum ratings: Up to 7V supply, -65°C to +125°C (Automotive-A Grade), -65°C to +150°C (Automotive-E Grade).

Data retention: >10 years at 125°C, >2 years at 150°C.

Maximum programming cycles: 100.

ESD protection: ≥2,000V (MIL-STD-883).

Latch-up immunity: ≥±200mA (JEDEC 17).

Power dissipation: 350mW (A-Grade), 217mW (E-Grade).

Junction temperature and package power dissipation should be confirmed using CyClocksRT power estimation prior to deployment, especially when using non-standard settings.

CY22393FXET Package Information (16-TSSOP)

The CY22393FXET comes in a 16-pin TSSOP package, measuring 4.40mm in width. This compact footprint and low profile are ideal for space-constrained environments typical in automotive and industrial electronics. The package weight is 0.05g, and is compliant with Pb-free requirements for environmentally friendly manufacturing.

Comparable or Alternative Models to CY22393FXET

For applications requiring alternatives to CY22393FXET, consider the following models:

CY22392FXET series (also from Infineon Technologies/Cypress): Similar architecture, may offer variations in output count or divisors.

Other programmable multi-PLL clock generators from Infineon’s automotive and industrial timing portfolio, which may differ in package, temperature rating, or feature set.

Competing automotive-grade programmable clock generators from other vendors (e.g., Texas Instruments, Microchip) with comparable PLL count, output configuration, and programmable capability.

Compatibility should be evaluated based on output frequency range, phase noise/jitter, configuration and programming interface, environmental ratings, and package form factor.

Conclusion

The Infineon Technologies CY22393FXET automotive clock generator provides engineers and procurement specialists with a versatile, high-accuracy, and highly configurable timing solution for complex automotive, industrial, and consumer applications. With its three programmable PLLs, advanced input/output configuration, robust power management, field programmability, and support for industry-standard programming software, the CY22393FXET streamlines the design of synchronized multi-frequency systems while meeting strict reliability and environmental requirements.

Its combination of flexibility, reliability, and ease of customization makes the CY22393FXET a standout choice in the programmable clock generator field. By reviewing the device’s architecture and programming options, engineers can address a wide array of application needs, from infotainment subsystems to engine control units, while maintaining the design agility necessary for evolving automotive standards. Consider the CY22393FXET and its potential equivalents when designing your next automotive or industrial timing solution.