Infineon Technologies CY23S08SXI-4T

Overview

CY23S08SXI-4T from Cypress Semiconductor is a 3.3V zero-delay clock buffer with on-chip PLL, designed for high-speed clock distribution in industrial-grade telecom and datacom systems. It delivers 2× reference frequency on all eight outputs (four per bank), supports 15–140 MHz operation with ≤100 ps output-to-output skew (same bank), and features spread-spectrum-aware feedback path for EMI-sensitive applications.

For engineers reviewing the CY23S08SXI-4T datasheet, CY23S08SXI-4T pinout, CY23S08SXI-4T application, or CY23S08SXI-4T equivalent, key selection criteria include industrial temperature range (–40°C to +85°C), 2× frequency multiplication capability, FBK-driven PLL architecture, low-cycle jitter (≤200 ps), and dual-bank three-state control via S1/S2 inputs.

Technical Context

The CY23S08SXI-4T implements a PLL-based zero-delay architecture where the REF input clock is phase-locked to the FBK signal derived from any output, enabling deterministic 2× frequency synthesis across both banks. Its internal /2 divider in the feedback path ensures exact doubling without external components.

It operates in four distinct functional modes controlled by S1/S2: full PLL operation, direct pass-through of REF to outputs, three-state for Bank B only, or full three-state shutdown. The device enters <50 µA power-down mode when REF lacks rising edges, preserving system-level power integrity.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (150-mil width), RoHS-compliant, industrial temperature grade.

Key Features

Applications

Equivalent & Alternatives

CY23S08SXI-4T has two functionally aligned industrial-grade alternatives with verified pin compatibility and configuration differences.

Compared with ICS853S08AGI-42LF and PI6C20400LEX, CY23S08SXI-4T uniquely combines industrial temperature rating, spread-spectrum transparency, and programmable bank-level three-state control-making it the only option for EMI-constrained, thermally variable telecom infrastructure requiring dynamic clock management.

Availability

CY23S08SXI-4T is available at Aetrix Electronics and suitable for industrial telecom line cards, data center switch fabric modules, and base station remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY23S08SXI-4T 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-reliability clock distribution in telecom and datacom infrastructure-emphasizing zero-delay accuracy, spread-spectrum compatibility, and industrial thermal robustness.

FAQ

What is the minimum load capacitance supported at 140 MHz?

The CY23S08SXI-4T supports 15 pF minimum load capacitance at 140 MHz, as specified in the switching characteristics table (Page 4). Operation below this value may cause excessive ringing or duty cycle distortion due to unterminated transmission lines.

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

No-the FBK pin must be driven exclusively by one of the device's own outputs (CLKA1–CLKA4 or CLKB1–CLKB4) to close the PLL loop. External feedback violates the zero-delay architecture and prevents lock; the datasheet explicitly requires internal feedback routing.

How does the device behave when S1 = S2 = 0?

When S1 = S2 = 0, both output banks enter three-state mode and the PLL shuts down, reducing supply current to ≤12 µA. This mode is used for complete clock disablement during system reset or deep sleep, with automatic recovery upon valid REF edges.

Is the 2× frequency multiplication fixed or configurable per bank?

The 2× multiplication is fixed and global-both banks output 2× the REF frequency when configured as CY23S08SXI-4T. Unlike the –2 variant, the –4 version does not support mixed-frequency operation; all eight outputs are locked to the doubled rate.