Infineon Technologies CY23EP09ZXI-1HT

Overview

CY23EP09ZXI-1HT from Cypress Semiconductor is a 2.5 V/3.3 V zero-delay clock buffer IC with nine low-skew outputs, integrated PLL feedback via CLKOUT, 45 ps typical output-output skew, 25 ps typical cycle-to-cycle jitter, and operation up to 220 MHz (3.3 V) or 200 MHz (2.5 V). It serves as a high-precision clock distribution device in FPGA timing, telecom line cards, and industrial control backplanes.

For engineers reviewing the CY23EP09ZXI-1HT datasheet, CY23EP09ZXI-1HT pinout, CY23EP09ZXI-1HT application, or CY23EP09ZXI-1HT equivalent, key selection criteria include zero-delay adjustability via CLKOUT loading, bank-selectable tri-state control (S1/S2), industrial temperature support (–40 °C to +85 °C), and high-drive vs. standard-drive output variants.

Technical Context

The CY23EP09ZXI-1HT implements an on-chip PLL with internal feedback sourced from the CLKOUT pin, enabling true zero input-output propagation delay when outputs are uniformly loaded. Its dual-bank architecture (4+4+1 outputs) supports selective tri-state control of Bank B via S1/S2 inputs.

In PLL bypass mode (S2:S1 = 1:0), the REF signal passes directly to all outputs with sub-5 ns delay, eliminating PLL lock dependency. The device enters <25 µA power-down state when REF frequency drops below ~2 MHz, tri-stating all outputs and disabling the PLL.

Key Specifications

Pinout & Package

Package: 16-pin thin shrunk small outline package (TSSOP), 4.4 mm body width, 0.65 mm pitch, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

Two verified alternatives exist for CY23EP09ZXI-1HT with documented functional and parametric differences.

Compared with IDT8T49N286A and ICS85310AMLF, the CY23EP09ZXI-1HT uniquely combines industrial temperature operation, hardware-selectable bank tri-state, and adjustable zero-delay via CLKOUT loading-making it optimal for ruggedized, real-time clock distribution where deterministic startup and dynamic reconfiguration are mandatory.

Availability

CY23EP09ZXI-1HT is available at Aetrix Electronics and suitable for FPGA clock distribution, telecom line card timing, and industrial motor drive controller designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY23EP09ZXI-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 CY23EP09 product line targets high-reliability clock distribution in systems demanding sub-100 ps skew and zero-delay adjustability-specifically engineered for telecom infrastructure, test equipment, and real-time control applications.

FAQ

What is the purpose of the CLKOUT pin beyond feedback?

The CLKOUT pin provides the internal PLL feedback path, but its external loading directly controls input-output propagation delay. Adding capacitance to CLKOUT shifts the PLL phase to compensate for board trace delays. When CLKOUT is loaded identically to other outputs (e.g., 5 pF each), zero delay is achieved. This makes CLKOUT a tuning node-not just a monitor output.

Can Bank B outputs be disabled while Bank A remains active?

Yes. Setting S2:S1 = 0:0 places Bank B (CLKB1–CLKB4) in high-impedance state while Bank A (CLKA1–CLKA4) and CLKOUT remain fully operational. This is confirmed in the Select Input Decoding table (page 4 of datasheet) and enables partial clock tree shutdown for power optimization without disrupting critical timing paths.

Does the CY23EP09ZXI-1HT support 5 V tolerant inputs?

No. The device is strictly 2.5 V or 3.3 V operation. REF input voltage must stay within VIH/VIL limits specified for the selected VDD (e.g., VIH ≥ 2.0 V at 3.3 V supply). Applying 5 V to REF or any pin exceeds absolute maximum ratings and risks permanent damage, as explicitly stated in the datasheet's "Not intended for 5 V input-tolerant applications" note.

How does power-down mode affect output states?

When REF frequency falls below ~2 MHz, the PLL shuts down and all outputs (including CLKOUT) enter high-impedance state. Supply current drops to ≤25 µA (industrial grade). Outputs remain tri-stated until a valid clock resumes on REF and the PLL relocks-no glitch or bounce occurs during entry/exit, ensuring safe clock gating in sleep-mode systems.