Infineon Technologies CY2305CSXC-1T

Overview

CY2305CSXC-1T from Cypress Semiconductor is a 3.3 V zero-delay clock buffer IC with one reference input and five low-skew buffered outputs (CLK1–CLK4, CLKOUT), operating from 10 MHz to 133 MHz, featuring on-chip PLL for zero input-to-output propagation delay, 50 ps typical cycle-to-cycle jitter at 66 MHz/15 pF, and power-down mode drawing <12 µA (commercial temp). It is used in high-speed digital systems requiring precise clock distribution, such as FPGA-based communication interfaces.

For engineers reviewing the CY2305CSXC-1T datasheet, CY2305CSXC-1T pinout, CY2305CSXC-1T application, or CY2305CSXC-1T equivalent, key selection criteria include guaranteed zero-delay operation under matched capacitive loading, 8-pin SOIC package compatibility, 3.3 V supply requirement, commercial temperature range (0°C to 70°C), and PLL-based skew control architecture.

Technical Context

The CY2305CSXC-1T implements an internal PLL with feedback sourced from the CLKOUT pin, enabling true zero input-to-output delay when all outputs-including CLKOUT-are uniformly loaded. Its PLL locks to the REF input and drives five synchronized CMOS-compatible outputs with sub-100 ps output-to-output skew.

It supports automatic power-down when REF is inactive (no rising edges), tri-stating all outputs and reducing supply current to <12 µA. Unlike the CY2309C, it lacks select inputs (S1/S2) and banked outputs-its architecture is fixed 1:5 fanout without output gating or PLL bypass modes.

Key Specifications

Pinout & Package

Package: 8-pin 150-mil SOIC (small outline integrated circuit), surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

Cypress CY2305CSXC-1T has two functionally comparable alternatives with verified pin, electrical, and thermal compatibility.

Compared with IDT 8T49N241-101NLGI and ON Semi NB3N3010CDG, the CY2305CSXC-1T uniquely delivers self-calibrating zero delay via on-chip PLL feedback while retaining SOIC-8 footprint and sub-12 µA power-down current-critical for space-constrained, low-power clock trees.

Availability

CY2305CSXC-1T is available at Aetrix Electronics and suitable for PCIe Gen1 clock distribution, FPGA configuration clocking, and industrial Ethernet PHY synchronization requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for CY2305CSXC-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 programmable logic solutions for industrial, automotive, and communications markets.

The CY2305C product line delivers zero-delay clock fanout buffers optimized for 3.3 V systems needing deterministic, low-skew clock distribution without frequency translation-targeting FPGA, ASIC, and memory interface applications.

FAQ

What is the role of the CLKOUT pin in CY2305CSXC-1T?

The CLKOUT pin serves as the internal PLL feedback node. Its capacitive load directly controls the phase relationship between REF and all outputs. To achieve zero input-to-output delay, CLKOUT must be loaded identically to CLK1–CLK4-even if unused-using matched PCB traces and termination. This is not optional; mismatched loading introduces deterministic delay error.

Does CY2305CSXC-1T support spread-spectrum clocking (SSC)?

No. The CY2305CSXC-1T implements a fixed-ratio PLL with no modulation capability. It does not support SSC input or generate spread-spectrum output. For systems requiring EMI reduction via SSC, consider Infineon's FXMA series or Silicon Labs Si5332, which offer programmable spread-spectrum features.

Can CY2305CSXC-1T operate with a 2.5 V supply?

No. The device is specified only for 3.0 V to 3.6 V operation per its Absolute Maximum and Operating Conditions tables. Supplying 2.5 V will prevent PLL lock, cause output instability, and violate the VIL/VIH thresholds-resulting in undefined behavior or complete functional failure.

How is power-down mode triggered and exited?

Power-down activates automatically when the REF input ceases toggling (no rising edges detected). Outputs go high-impedance and supply current drops to <12 µA. Exit occurs within 100 µs of the first REF rising edge after power-up or wake event-no external reset or control signal is needed.