Infineon Technologies CY2309ZXI-1HT

Overview

CY2309ZXI-1HT from Infineon Technologies (formerly Cypress) is a 3.3 V zero-delay clock buffer IC with PLL-based synchronization, nine low-skew CMOS outputs (4+4+1 banked configuration), 10–133 MHz operating range, and industrial temperature support (–40°C to +85°C). It serves as a high-fidelity clock distribution device in Pentium-compatible CPU systems, PCI bus timing networks, and multi-processor clock trees where deterministic phase alignment is critical.

For engineers reviewing the CY2309ZXI-1HT datasheet, CY2309ZXI-1HT pinout, CY2309ZXI-1HT application, or CY2309ZXI-1HT equivalent, key selection criteria include output bank control via S1/S2 select inputs, CLKOUT feedback loading requirements for zero delay tuning, industrial-grade jitter performance (60 ps typical cycle-to-cycle), and compatibility with 5-V tolerant REF input in 3.3-V systems.

Technical Context

The CY2309ZXI-1HT integrates an on-chip PLL with internal feedback routed from the CLKOUT pin, enabling true zero input-to-output propagation delay when all outputs-including CLKOUT-are uniformly loaded. Its dual-bank architecture (Bank A: CLKA1–CLKA4; Bank B: CLKB1–CLKB4) supports dynamic output enable/disable via S1/S2 logic decoding.

It features three-state capability for Bank B outputs, reference bypass test mode, and automatic PLL power-down during REF signal loss-reducing supply current to ≤25.0 μA. The –1HT suffix denotes industrial temperature grade (–40°C to +85°C) and high-drive (-1H) output stage with faster rise/fall times than standard -1 variants.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (150-mil width) or 4.4-mm TSSOP - surface-mount compatible with automated assembly and thermal performance validated for industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

Two functionally comparable alternatives exist with verified pin, electrical, and thermal compatibility for drop-in replacement evaluation.

Compared with IDT5V9885NLGI and NB3N502DR2G, the CY2309ZXI-1HT uniquely delivers industrial-grade zero-delay operation with programmable bank control and 133 MHz support-making it the sole option for high-frequency, thermally demanding, and dynamically configurable clock trees.

Availability

CY2309ZXI-1HT is available at Aetrix Electronics and suitable for desktop CPU clock distribution, industrial PLC backplane timing, and PCI bus synchronization requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY2309ZXI-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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and security solutions for automotive, industrial, and IoT applications.

The CY2309 product line was originally developed by Cypress Semiconductor and continues under Infineon's timing portfolio to address high-fidelity, low-skew clock distribution needs in compute, industrial control, and communications infrastructure.

FAQ

What is the purpose of the CLKOUT pin beyond feedback?

The CLKOUT pin provides the internal PLL feedback signal and must be loaded identically to other outputs to achieve zero input-output delay. Even when unused in the system, it requires a matched capacitive load (e.g., 10 pF above 100 MHz) to maintain phase alignment-omitting this load introduces measurable delay drift.

How does the S1/S2 select logic affect power consumption?

S1/S2 control Bank B output state and PLL activity: when set to '10', Bank B outputs are driven while PLL remains active; when '00', both banks are three-stated and PLL stays enabled; only '11' disables PLL (reducing IDD to ≤25 μA). This enables fine-grained power/performance tradeoffs without external logic.

Can CY2309ZXI-1HT drive 50 Ω transmission lines directly?

No-it is designed for CMOS fanout into capacitive loads (max 10–30 pF), not 50 Ω resistive termination. Driving 50 Ω lines directly causes excessive current draw, signal distortion, and violates VOL/VOH specs. Use series-terminated drivers (e.g., SN65LVDSx) for point-to-point differential routing.

Is the REF input compatible with LVDS or HCSL sources?

No-REF accepts single-ended CMOS/TTL signals only, with 5-V tolerance and VDD/2 threshold. LVDS or HCSL sources require AC-coupling and level translation (e.g., using a TI SN65LVDTxx translator) to meet input voltage and threshold requirements.