Infineon Technologies CY2308SXI-1T

Overview

CY2308SXI-1T from Cypress Semiconductor is a 3.3 V zero-delay clock buffer with on-chip PLL, designed to distribute high-speed reference clocks in PC, workstation, and telecom systems. It delivers eight low-skew CMOS outputs (two banks of four), supports 10–133 MHz input frequency, achieves <200 ps output-to-output skew, and features dual three-state control via S1/S2 pins for flexible bank management.

For engineers reviewing the CY2308SXI-1T datasheet, CY2308SXI-1T pinout, CY2308SXI-1T application, or CY2308SXI-1T equivalent, this device is selected for precise clock distribution where zero input-output delay, sub-700 ps inter-device skew, and industrial temperature operation (–40°C to +85°C) are required in high-performance timing architectures.

Technical Context

The CY2308SXI-1T implements a PLL-based zero-delay architecture where the REF input drives an internal phase-locked loop, and external feedback from any output (connected to FBK) closes the loop to nullify propagation delay. Its two independent output banks (A and B) are controlled by S1/S2 select inputs, enabling tri-state, direct pass-through, or PLL-bypass modes per bank.

It operates at 3.3 V with load-dependent frequency limits: up to 133 MHz at 15 pF, 100 MHz at 30 pF; cycle-to-cycle jitter is 75 ps typical (66 MHz, 15 pF); power-down current is ≤25 µA when REF stalls. The -1T suffix denotes industrial temperature grade and TSSOP-16 package.

Key Specifications

Pinout & Package

Package: 16-pin TSSOP (thin shrink small outline package), 0.65 mm pitch, body size 4.4 mm × 5.0 mm, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

Cypress CY2308SXI-1T is functionally matched by two industrial-grade alternatives with verified pin compatibility and documented performance trade-offs.

Compared with IDT 8T49N241NLGI and ON Semi NB3N3020DTG, CY2308SXI-1T uniquely balances fixed-ratio zero-delay distribution, dual-bank flexibility, and industrial temperature reliability - making it optimal for deterministic, low-jitter clock trees where configurability and thermal robustness are prioritized over synthesis capability or cost minimization.

Availability

CY2308SXI-1T is available at Aetrix Electronics and suitable for PCIe Gen2 root complexes, industrial Ethernet switches, and telecom line cards requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for CY2308SXI-1T 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 computing, communications, and industrial markets.

The CY2308 product line delivers zero-delay clock distribution ICs optimized for deterministic, low-skew clock fanout in high-speed digital systems - targeting applications where phase alignment, jitter control, and thermal reliability are critical.

FAQ

What is the maximum load capacitance supported at 133 MHz?

The CY2308SXI-1T supports up to 15 pF load capacitance at 133 MHz, as specified in the industrial temperature switching characteristics table. Exceeding this value degrades rise/fall times and increases jitter beyond guaranteed limits. For 30 pF loads, maximum frequency is limited to 100 MHz.

How does the FBK pin affect input-output delay?

The FBK pin receives feedback from any selected output; its capacitive loading relative to other outputs directly adjusts input-output delay. Equal loading across all outputs yields true zero delay. A 5 pF difference between FBK and other outputs introduces ~150 ps delay, per the Zero Delay and Skew Control graph in the datasheet.

Can both output banks operate at different frequencies simultaneously?

No - the CY2308SXI-1T is the -1 configuration variant, which provides 1× reference frequency on both banks. Frequency ratio flexibility (e.g., 2×/1×) requires CY2308-2 or CY2308-3 variants. This part's internal divider is fixed and non-programmable.

Is the TSSOP-16 package RoHS-compliant and lead-free?

Yes - CY2308SXI-1T uses a lead-free, RoHS-compliant TSSOP-16 package, with matte tin finish on leads and halogen-free molding compound, meeting JEDEC J-STD-020C reflow profile requirements for Pb-free assembly.