Infineon Technologies CY2305CSXI-1HT

Overview

CY2305CSXI-1HT from Cypress Semiconductor is a 3.3 V zero-delay clock buffer IC with one input driving five low-skew CMOS clock outputs, operating from 10 MHz to 133 MHz, featuring 50 ps typical cycle-to-cycle jitter at 66 MHz (15 pF load), on-chip PLL with internal feedback via CLKOUT pin, and power-down mode drawing ≤25 µA at industrial temperature (–40°C to +85°C). It is used in high-speed digital systems requiring precise clock distribution, such as FPGA-based control modules and industrial PLC timing subsystems.

For engineers reviewing the CY2305CSXI-1HT datasheet, CY2305CSXI-1HT pinout, CY2305CSXI-1HT application, or CY2305CSXI-1HT equivalent, key selection criteria include guaranteed zero input-output delay under matched loading, industrial-grade thermal stability, 8-pin SOIC package compatibility, and high-drive –1H output slew rate for fast-edge clock fanout.

Technical Context

The CY2305CSXI-1HT implements an on-chip PLL locked to the REF input, with internal feedback sourced exclusively from the CLKOUT pin to achieve zero propagation delay between REF and all outputs when uniformly loaded. Its architecture requires identical capacitive loading on CLKOUT and all buffered outputs (CLK1–CLK4, CLKOUT) to maintain true zero delay and sub-100 ps output-to-output skew.

This device operates in two functional states: normal PLL-locked mode (all outputs active, low-jitter distribution) and power-down mode (REF idle → outputs three-stated, IDD ≤25 µA). Unlike the CY2309C, it lacks select inputs (S1/S2) and banked outputs-its five outputs are fully concurrent and unswitchable.

Key Specifications

Pinout & Package

Package: 8-pin 150-mil SOIC (small outline integrated circuit), surface-mount, RoHS-compliant, body width 3.9 mm.

Key Features

Applications

Equivalent & Alternatives

Cypress CY2305CSXI-1HT has two verified drop-in alternatives with documented functional and parametric alignment.

Compared with IDT 5V2310APGI and ON Semi NB3N3010DR2G, CY2305CSXI-1HT uniquely combines industrial temperature rating, 50 ps jitter, zero-delay calibration capability, and 3.3 V–compatible –1H drive strength - making it the sole option for high-reliability, low-jitter clock distribution in thermally demanding embedded systems.

Availability

CY2305CSXI-1HT is available at Aetrix Electronics and suitable for industrial PLC timing modules, FPGA clock distribution subsystems, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY2305CSXI-1HT 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.

The CY2305C product line delivers zero-delay clock buffering for systems demanding deterministic timing, targeting applications where PLL-based skew cancellation and industrial-grade reliability are mandatory.

FAQ

What is the minimum load capacitance required on CLKOUT to achieve zero input-output delay?

CLKOUT must be loaded with the same capacitance as CLK1–CLK4 - 10 pF maximum for frequencies ≥100 MHz, or up to 30 pF below 100 MHz. Mismatched loading introduces measurable delay offset per Figure 3 in the datasheet, directly impacting system timing closure.

Does CY2305CSXI-1HT support spread-spectrum clocking (SSC)?

No. The CY2305CSXI-1HT contains a fixed-ratio PLL with no modulation input or SSC enable feature. It is designed strictly for low-jitter, deterministic clock replication - spread-spectrum functionality is absent in both silicon and register map.

Can the device operate with a 2.5 V supply?

No. Absolute maximum VDD is 3.6 V and minimum is 3.0 V per datasheet Section 7. Operation outside 3.0–3.6 V violates specifications, risks PLL unlock, and invalidates jitter and skew guarantees. 2.5 V is electrically incompatible.

Is there a recommended PCB layout practice for minimizing output skew?

Yes: route all output traces (CLK1–CLK4, CLKOUT) with identical length, impedance (50 Ω), and layer stackup; place decoupling capacitor ≤2 mm from VDD pin; avoid vias on clock paths; and terminate each output with a 10–30 pF capacitive load matching the CLKOUT load to preserve zero-delay calibration.