Infineon Technologies CY2308SXI-3T

Overview

CY2308SXI-3T from Cypress Semiconductor is a 3.3V zero-delay clock buffer with on-chip PLL, designed for high-speed clock distribution in PC, telecom, and datacom systems. It delivers 10–133 MHz operation, <200 ps output-to-output skew, 75 ps typical cycle-to-cycle jitter at 66 MHz (15 pF), and supports two independently three-stateable banks of four LVCMOS outputs in a 16-pin SOIC package.

For engineers reviewing the CY2308SXI-3T datasheet, CY2308SXI-3T pinout, CY2308SXI-3T application, or CY2308SXI-3T equivalent, key selection criteria include input-output delay adjustability via FBK load tuning, industrial temperature range (–40°C to +85°C), dual-bank select control (S1/S2), PLL power-down mode (<25 μA), and configuration-specific frequency multiplication (e.g., 2×/4×).

Technical Context

The CY2308SXI-3T implements a PLL-based zero-delay architecture where the REF input clocks the internal PLL, and feedback is routed from one of eight outputs to the FBK pin to close the loop. Input-to-output propagation delay is actively adjustable by varying capacitive loading on FBK relative to other outputs.

It features two independent output banks (A and B), each with four LVCMOS outputs, controlled by S1/S2 select inputs to enable tri-state, bypass, or PLL-driven modes. The device enters low-power shutdown (<25 μA) when REF lacks rising edges or under specific S1/S2 states, and supports multi-device synchronization with <700 ps inter-device skew.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (150 mil), surface-mount, JEDEC MS-012AC compliant, with exposed pad not present. Thermal resistance θ_JA = 120°C/W (typ.) under standard 2-layer board conditions.

Key Features

Applications

Equivalent & Alternatives

CY2308SXI-3T is a specific configuration (–3 variant) of the CY2308 family; alternatives must match its 4×/2× dual-bank frequency capability and industrial temperature rating.

Compared with IDT 8T49N241 and NB3N3010B, CY2308SXI-3T uniquely balances fixed-ratio frequency multiplication, dual-bank control, industrial temperature operation, and ultra-low skew - making it optimal for telecom/datacom clock trees where deterministic phase relationships and reliability are non-negotiable.

Availability

CY2308SXI-3T is available at Aetrix Electronics and suitable for PC motherboard clock distribution, telecom line card timing, and industrial embedded controller applications requiring stable component supply, long-lifecycle availability, and guaranteed industrial temperature performance.

Supply support for CY2308SXI-3T 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, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

CY2308 belongs to Cypress's high-performance clock buffer product line, engineered specifically for low-skew, zero-delay clock distribution in high-speed digital systems where deterministic timing and multi-bank control are critical.

FAQ

What is the function of the FBK pin in CY2308SXI-3T?

The FBK pin receives feedback from one of the eight output clocks to close the internal PLL loop. Its capacitive loading relative to other outputs directly controls input-output propagation delay - equal loading yields true zero delay, while differential loading adjusts delay in ±250 ps range. This eliminates need for PCB trace-length tuning.

How does CY2308SXI-3T differ from CY2308SXI-1?

CY2308SXI-3T is the –3 configuration variant, supporting 4× reference frequency on Bank A and 2× on Bank B when FBK is driven from Bank A, or 4×/2× with phase ambiguity if driven from Bank B. In contrast, CY2308SXI-1 provides 1× output on both banks and lacks frequency multiplication capability.

Can CY2308SXI-3T operate with a 5V input clock?

Yes - the REF pin is explicitly rated 5V-tolerant per datasheet Absolute Maximum Ratings (–0.5 V to +7.0 V), allowing direct connection to 5V TTL or CMOS clock sources without level shifters. All other inputs and outputs remain 3.3V LVCMOS compliant.

What happens to outputs when S1 = 1 and S2 = 0?

Per Select Input Decoding table, S2=1 and S1=0 places both banks in "Driven" mode using the reference clock directly (bypass mode). For CY2308–3, this causes inversion on all outputs - a documented behavior used for phase alignment in specific topologies, not a fault condition.