Infineon Technologies CY23S08SXI-1HT

Overview

CY23S08SXI-1HT from Cypress Semiconductor is a 3.3V zero-delay clock buffer IC with on-chip PLL, designed for high-speed clock distribution in industrial-grade systems. It delivers ≤350 ps input-to-output propagation delay, <105 ps typical output-to-output skew (–1H), and supports 10–140 MHz operation across two independently controllable banks of four LVCMOS outputs. Used in telecom backplanes and industrial controllers requiring deterministic timing.

For engineers reviewing the CY23S08SXI-1HT datasheet, CY23S08SXI-1HT pinout, CY23S08SXI-1HT application, or CY23S08SXI-1HT equivalent, key selection criteria include industrial temperature support (–40°C to +85°C), spread-spectrum-aware feedback path, bank-selectable three-state control, and high-drive output capability (12 mA sink/source).

Technical Context

The CY23S08SXI-1HT implements a PLL-based zero-delay architecture where the REF input clock locks to an internal VCO, and the FBK pin must be connected to one of the eight outputs to close the loop. Propagation delay is actively compensated via capacitive tuning on FBK, enabling sub-nanosecond alignment across loads.

It features dual-bank output architecture (CLKA1–4 and CLKB1–4), each bank individually three-stateable via S1/S2 select inputs per Table 2. The –1H variant uses advanced drive circuitry yielding faster rise/fall times (≤1.5 ns at 30 pF) and higher output current (±12 mA) versus standard –1 devices.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (150-mil width), RoHS-compliant, industrial temperature grade (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-delay clock buffer applications.

Compared with IDT 8T49N241 and ON Semi NB3N3020B, the CY23S08SXI-1HT uniquely balances industrial reliability, dual-bank flexibility, and spread-spectrum transparency-making it optimal for fixed-frequency, multi-node clock trees in harsh environments.

Availability

CY23S08SXI-1HT is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY23S08SXI-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 timing, memory, and programmable solutions for industrial, automotive, and communications markets.

The CY23S08 product line was engineered specifically for high-fidelity clock distribution in systems where deterministic delay, low skew, and spread-spectrum compatibility are mandatory-targeting telecom, test equipment, and industrial control applications.

FAQ

What is the maximum load capacitance supported at 140 MHz?

The CY23S08SXI-1HT supports up to 15 pF load capacitance at 140 MHz, as specified in the Electrical Characteristics table on page 4 of the datasheet. Exceeding this value increases rise/fall time and may cause duty cycle distortion or failure to meet skew specifications.

Can the FBK pin be driven from an external source instead of an internal output?

No-the FBK pin must be connected to one of the device's own outputs (CLKA1–4 or CLKB1–4) to close the PLL feedback loop. External driving violates the zero-delay architecture and prevents proper lock; the datasheet explicitly requires internal feedback routing per Figure 1 and Functional Description.

How does the CY23S08SXI-1HT handle loss of reference clock?

When no rising edges occur on the REF pin, the PLL enters power-down mode: all outputs go three-state, and supply current drops to <12 μA. This behavior is automatic and requires no external control-enabling fail-safe clock gating during upstream clock failures.

Is the CY23S08SXI-1HT pin-compatible with the CY23S08SXC-1H?

Yes-both share identical 16-pin SOIC footprint and pin functions. The only differences are operating temperature range (industrial vs. commercial) and tape-and-reel packaging ('T' suffix). No layout change is needed when upgrading from commercial to industrial grade.