Infineon Technologies CY23S05SXC-1HT

Overview

CY23S05SXC-1HT from Cypress Semiconductor is a 3.3 V, commercial-temperature (0 °C to 70 °C), high-drive zero-delay clock buffer IC with one input and five low-skew outputs. It features <100 ps cycle-to-cycle jitter, <250 ps output-to-output skew, and operates up to 100 MHz (133 MHz capable). Designed for CPU and PCI bus clock distribution, it uses an on-chip PLL with internal feedback via CLKOUT to achieve near-zero input-output propagation delay.

For engineers reviewing the CY23S05SXC-1HT datasheet, CY23S05SXC-1HT pinout, CY23S05SXC-1HT application, or CY23S05SXC-1HT equivalent, this device supports precise timing synchronization in multi-clock domain systems where skew control, spread-spectrum compatibility, and load-matched delay tuning are critical design requirements.

Technical Context

The CY23S05SXC-1HT implements a PLL-based zero-delay architecture where the CLKOUT pin provides internal feedback; its capacitive loading directly adjusts input-to-output delay. All five outputs share identical drive strength and are weakly pulled down, enabling uniform termination and skew minimization when equally loaded.

It supports Spread Spectrum Frequency Timing Generation (SSFTG) pass-through without filtering, preserving reference input modulation for EMI reduction. The -1H variant delivers faster rise/fall times (1.5 ns typ.) than the -1 version, enabling cleaner edges at higher frequencies while maintaining <200 ps cycle-to-cycle jitter at 66.67 MHz.

Key Specifications

Pinout & Package

Package: 8-pin, 150-mil SOIC (SZ08), lead-free, tape-and-reel format.

Key Features

Applications

Equivalent & Alternatives

CY23S05SXC-1T and CY23S05SXI-1H are verified functional alternatives with documented differences in drive strength, temperature range, and packaging.

Compared with CY23S05SXC-1T and CY23S05SXI-1H, the CY23S05SXC-1HT uniquely combines commercial-temperature operation, high-drive performance, and tape-and-reel delivery-making it optimal for high-volume desktop, server, and industrial computing applications demanding both timing precision and supply-chain readiness.

Availability

CY23S05SXC-1HT is available at Aetrix Electronics and suitable for desktop CPU clock distribution, PCI bus synchronization, and embedded x86 system clock trees requiring stable component supply, consistent lead times, and full traceability.

Supply support for CY23S05SXC-1HT 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 computing, communications, and industrial markets.

The CY23S05 product line delivers cost-optimized, spread-aware zero-delay clock buffers targeting PC, server, and industrial motherboard designs where deterministic skew, EMI compliance, and pin-compatible scalability are essential.

FAQ

What is the purpose of the CLKOUT pin on CY23S05SXC-1HT?

The CLKOUT pin provides internal PLL feedback and must be loaded identically to other outputs to achieve zero input-output propagation delay. Its capacitive loading directly tunes the phase relationship between REF and all buffered outputs. Even if unused, CLKOUT requires a matched load (e.g., 10–30 pF) to maintain specified skew and jitter performance.

Does CY23S05SXC-1HT support spread-spectrum clocking?

Yes-it is explicitly designed as "Spread Aware" and passes through spread-spectrum modulation from the REF input without filtering or distortion. This preserves the EMI-reduction benefit of SSFTG while maintaining tight output skew, unlike non-Spread Aware buffers that introduce tracking skew under modulated inputs.

How does the -1H suffix affect electrical performance?

The -1H suffix denotes high-drive capability: rise and fall times are 1.5 ns (typ.) versus 2.5 ns for -1 versions, improving signal integrity at 100+ MHz. It also increases output current drive, reducing sensitivity to trace impedance mismatches and enabling longer routing without waveform degradation.

Can CY23S05SXC-1HT operate without external configuration?

Yes-it functions autonomously with only VDD, GND, and REF connected. No external resistors, capacitors, or configuration pins are required. Select inputs are absent in the CY23S05 (unlike CY23S09), simplifying integration into fixed-function clock trees.