Infineon Technologies CY2304SXI-1T

Overview

CY2304SXI-1T from Infineon Technologies (formerly Cypress) is a 3.3 V zero-delay clock buffer with on-chip PLL, designed for high-speed clock distribution in industrial embedded systems. It delivers four low-skew LVCMOS outputs across two banks, supports 10–133 MHz input frequencies, guarantees ≤200 ps output-to-output skew, and operates from –40 °C to +85 °C in an 8-pin SOIC package.

For engineers reviewing the CY2304SXI-1T datasheet, CY2304SXI-1T pinout, CY2304SXI-1T application, or CY2304SXI-1T equivalent, key selection criteria include industrial temperature support, zero-input-output delay adjustability via FBK loading, bank-specific frequency configuration (REF or REF/2), and device-to-device skew <500 ps in multi-buffer clock trees.

Technical Context

The CY2304SXI-1T implements a PLL-based zero-delay architecture where the feedback path must be closed from one of the four outputs (CLKA1, CLKA2, CLKB1, or CLKB2) to the FBK pin. Its dual-bank output structure enables independent frequency derivation: Bank A outputs match REF when FBK is sourced from Bank B, while Bank B outputs run at REF/2 when FBK is sourced from Bank A - per the CY2304-2 configuration.

Skew control relies on matched capacitive loading across all outputs including the FBK-driven output; unequal loading introduces deterministic input-output delay up to ±250 ps. Power-down mode activates automatically upon loss of REF edges, tri-stating all outputs and reducing supply current to ≤25 μA.

Key Specifications

Pinout & Package

Package: 8-pin 150-mil SOIC (Small Outline Integrated Circuit), surface-mount, RoHS-compliant, JEDEC MS-012AC.

Key Features

Applications

Equivalent & Alternatives

Two validated alternatives exist for CY2304SXI-1T in industrial temperature applications requiring zero-delay buffering and dual-bank frequency options.

Compared with ICS8304AM-01LFT and PI6C20400LEX, CY2304SXI-1T uniquely supports on-the-fly frequency ratio selection between banks via FBK routing - enabling adaptive clock tree design without hardware changes or additional components.

Availability

CY2304SXI-1T is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line cards, and automotive ADAS domain controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY2304SXI-1T 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 global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and security solutions for industrial, automotive, and communications markets.

The CY2304 product line was originally developed by Cypress Semiconductor and continues under Infineon's timing portfolio to address high-precision, low-skew clock distribution needs in industrial and telecom infrastructure where deterministic phase alignment is critical.

FAQ

What is the function of the FBK pin, and how does it affect timing?

The FBK pin closes the internal PLL feedback loop and must be driven by one of the four output pins. Its capacitive loading relative to other outputs directly adjusts input-to-output propagation delay - equal loading yields zero delay, while mismatched loading introduces predictable delay up to ±250 ps. This allows fine-grained phase alignment without external components.

Can CY2304SXI-1T generate different frequencies on Bank A and Bank B simultaneously?

Yes. When FBK is driven from Bank A, Bank B outputs run at REF/2 while Bank A outputs match REF. When FBK is driven from Bank B, Bank A outputs run at REF/2 and Bank B outputs match REF. This dual-ratio capability is inherent to the CY2304-2 configuration and requires no external logic or configuration pins.

How does power-down mode activate, and what happens to the outputs?

Power-down activates automatically when the REF input stops toggling - detected by absence of rising edges. Within 1 ms, the PLL shuts down, all four outputs enter high-impedance (tri-state), and supply current drops to ≤25 μA. No external control signal is required, making it ideal for systems with dynamic clock gating.

Is the CY2304SXI-1T pin-compatible with other CY2304 variants like CY2304SXC?

Yes - all CY2304 variants (SXC, SXI, SXIT) share identical 8-pin SOIC packaging and pinout. The only differences are operating temperature grade (0–70 °C vs. –40–85 °C) and associated electrical specifications (e.g., higher IDD in industrial grade). No PCB redesign is needed when upgrading from commercial to industrial temperature versions.