Infineon Technologies CY23S05SXI-1

Overview

CY23S05SXI-1 from Cypress Semiconductor is an industrial-grade, 3.3 V zero-delay clock buffer IC with one input and five low-skew CMOS outputs. It features on-chip PLL architecture, 10–100 MHz operating range, <250 ps output-to-output skew, <700 ps device-to-device skew, and supports spread-spectrum clocking for EMI reduction in embedded computing systems.

For engineers reviewing the CY23S05SXI-1 datasheet, CY23S05SXI-1 pinout, CY23S05SXI-1 application, or CY23S05SXI-1 equivalent, key selection criteria include industrial temperature support (–40°C to +85°C), 8-pin SOIC package compatibility, zero-input-output propagation delay tuning via CLKOUT loading, and verified cycle-to-cycle jitter ≤200 ps at 66.67 MHz.

Technical Context

The CY23S05SXI-1 implements a fully integrated PLL with internal feedback routed through the CLKOUT pin, enabling precise zero-delay operation when all outputs-including CLKOUT-are equally loaded. Its PLL locks to a single REF input and drives five synchronized outputs with guaranteed sub-350 ps input-to-output delay variation.

It operates exclusively in 3.3 V supply (3.0–3.6 V), uses 0.65 µm CMOS technology, and enters power-down mode (<12 µA IDD) when REF has no rising edges. Unlike the CY23S09, it lacks select inputs and bank control-its five outputs are always active and identically configured.

Key Specifications

Pinout & Package

Package: 8-pin, 150-mil SOIC (SZ08), leaded, Pb-free compatible, thermal resistance θ_JA = 132 °C/W.

Key Features

Applications

Equivalent & Alternatives

CY23S05SXC-1 (commercial version) and CY23S05SXI-1H (industrial high-drive version) are functionally compatible alternatives with documented parameter differences.

Compared with CY23S05SXC-1 and CY23S05SXI-1H, the CY23S05SXI-1 delivers optimal balance of industrial reliability, standard drive capability, and proven jitter performance-making it ideal for volume industrial designs where enhanced drive is unnecessary and BOM cost is prioritized.

Availability

CY23S05SXI-1 is available at Aetrix Electronics and suitable for industrial PLC timing distribution, embedded CPU clock fanout, and network switch ASIC synchronization requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY23S05SXI-1 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 programmable system-on-chip (PSoC), memory, and timing solutions for industrial, automotive, and consumer markets.

The CY23S05 belongs to Cypress's Spread-Aware Zero-Delay Buffer product line, designed specifically to preserve spread-spectrum clocking while delivering ultra-low skew for EMI-sensitive computing and communications platforms.

FAQ

What is the purpose of the CLKOUT pin on CY23S05SXI-1?

The CLKOUT pin provides internal PLL feedback and must be loaded identically to other outputs to achieve zero input-output propagation delay. It is not optional-even if unused, a capacitive load matching other CLKx pins (e.g., 10–30 pF) is required to maintain timing accuracy. This loading directly adjusts the PLL phase offset.

Can CY23S05SXI-1 operate with a 2.5 V input clock?

No. The REF input is 5 V tolerant but requires a valid CMOS logic swing referenced to VDD (3.3 V). Its threshold is VDD/2 (≈1.65 V), so a 2.5 V input may not reliably cross the switching point. Input signals must swing between 0 V and VDD, with VIH ≥2.0 V and VIL ≤0.8 V per datasheet specifications.

Does CY23S05SXI-1 support differential input or output?

No. CY23S05SXI-1 accepts only single-ended CMOS/LVTTL input on REF and provides five single-ended CMOS outputs. It does not support LVDS, HCSL, or differential signaling. For differential clock distribution, Cypress offers separate families such as the CY2239x series.

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

Power-down activates automatically when no rising edges occur on REF for >1 ms. In this state, the PLL disables, all outputs go high-impedance (three-state), and supply current drops to ≤25 µA. Outputs resume normal operation within 1.0 ms after REF resumes activity, with full PLL lock re-established.