Infineon Technologies CY2308SXI-5HT

Overview

CY2308SXI-5HT from Cypress Semiconductor is a 3.3V zero-delay clock buffer with on-chip PLL, configured for REF/2 output on both banks (A and B), 16-pin SOIC package, industrial temperature range (–40°C to +85°C), and 75 ps typical cycle-to-cycle jitter at 66.67 MHz with 15 pF load. It distributes synchronized clocks in telecom backplanes and high-speed datacom systems.

For engineers reviewing the CY2308SXI-5HT datasheet, CY2308SXI-5HT pinout, CY2308SXI-5HT application, or CY2308SXI-5HT equivalent, this page delivers verified timing parameters, bank-selectable three-state control, PLL lock time (≤1.0 ms), input-output delay adjustment via FBK loading, and device-to-device skew (<700 ps) - all critical for deterministic clock tree design.

Technical Context

The CY2308SXI-5HT implements a PLL-based zero-delay architecture where the REF input locks to feedback sourced from any output pin (FBK), enabling precise input-output phase alignment. Its dual-bank structure (CLKA1–4 and CLKB1–4) supports independent three-state control via S1/S2 inputs, with S2=1/S1=0 forcing bypass mode and inverted outputs on –2/–3 variants - though not applicable here as –5H uses fixed /2 division.

This variant integrates an internal /2 divider in both feedback paths, delivering REF/2 on all eight outputs. It operates across 10–133.3 MHz input frequency (15 pF load), maintains <200 ps output-to-output skew within each bank, and enters power-down (<25 μA) when REF lacks rising edges - confirmed by Select Input Decoding table and electrical specs for industrial grade.

Key Specifications

Pinout & Package

16-pin 150-mil SOIC package (JEDEC MS-012AC), surface-mount, industrial-grade thermal performance (θ_JA = 120°C/W).

Key Features

Applications

Equivalent & Alternatives

Cypress CY2308SXI-5HT is functionally matched by two alternatives with documented differences in drive strength, frequency limits, or configuration flexibility.

Compared with IDT 8T49N241 and ON Semi NB3N3020B, CY2308SXI-5HT uniquely delivers factory-configured REF/2 on eight CMOS outputs with user-adjustable zero-delay via FBK loading - making it optimal for cost-sensitive, fixed-ratio clock fanout where phase alignment trumps frequency agility.

Availability

CY2308SXI-5HT is available at Aetrix Electronics and suitable for telecom line cards, industrial PLC backplanes, and medical imaging data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY2308SXI-5HT 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) designs high-performance timing, memory, and microcontroller solutions for industrial, automotive, and communications markets.

CY2308 belongs to Cypress's zero-delay buffer product line, engineered specifically for deterministic clock distribution in high-speed digital systems where phase alignment, low skew, and industrial reliability are non-negotiable.

FAQ

What is the maximum input frequency supported by CY2308SXI-5HT?

The CY2308SXI-5HT supports input frequencies up to 133.3 MHz when loaded with 15 pF, as specified in the Industrial Temperature Switching Characteristics table (Page 6). This limit applies specifically to the –5H variant due to its high-drive output stage and internal /2 divider architecture.

How is zero input-output delay achieved in practice?

Zero delay is achieved by driving the FBK pin from one output while matching its capacitive load to that of all other outputs. The CY2308's PLL adjusts phase until the delay from REF to that FBK-driven output equals the internal feedback path delay - resulting in net zero propagation delay, tunable via load balancing per Figure 2.

Can both output banks be disabled independently?

Yes. S1 and S2 inputs decode into four states: S2=0/S1=0 disables both banks; S2=0/S1=1 enables Bank A only; S2=1/S1=0 enables Bank B only (with inversion on –2/–3 variants - not applicable to –5H); S2=1/S1=1 enables both. This is confirmed in the Select Input Decoding table on Page 2.

Does CY2308SXI-5HT require an external crystal or oscillator?

No. The CY2308SXI-5HT is a zero-delay buffer, not a clock generator - it requires an external reference clock applied to the REF pin. It contains no crystal terminals or oscillator circuitry; its PLL locks to the supplied REF signal and redistributes it with /2 division and phase alignment.