CYPRESS CY2309ZXI-1H
- 3.3V zero delay PLL clock buffer with 1:9 LVCMOS fanout — one input, nine low-skew outputs
- Input frequency range 10MHz to 133MHz; -1H suffix provides higher output drive strength vs. standard -1 variant
- Input-to-output skew <250ps, output-to-output skew <200ps across both output banks
- On-chip PLL with automatic power-down below 25µA when REF input is inactive
- Industrial temperature range −40°C to +85°C, 16-pin TSSOP (5.1 × 4.5mm), 3.0V to 3.6V supply
Cypress Semiconductor (now Infineon Technologies) developed the CY2309 as a low-cost, high-performance zero delay PLL clock buffer for distributing a single reference clock to nine LVCMOS outputs with deterministic, sub-250ps input-to-output skew. The CY2309ZXI-1H is available from stock at Sparkle Electronics, serving embedded systems engineers, networking equipment OEMs, defense subcontractor procurement teams, and production programs requiring reliable access to Cypress clock distribution silicon with verified sourcing and same-day response on pricing and availability inquiries. The ZXI suffix designates the 16-pin TSSOP package with industrial temperature grade (−40°C to +85°C), and the -1H suffix identifies the higher drive strength variant — rated for operation up to 133MHz and providing increased output current capability relative to the standard -1 devices, making it the correct specification for systems driving multiple parallel loads or longer PCB traces from a single clock distribution point.
The CY2309ZXI-1H integrates an on-chip PLL that locks to the reference clock presented on the REF pin, with feedback derived internally from the CLKOUT pad — eliminating the external feedback routing required on the CY2308 and simplifying board layout for zero-delay clock distribution applications. Two independently controlled banks of four outputs each allow Bank B to be three-stated via select inputs when fewer than nine output loads are required, reducing power consumption in partial-fanout configurations. The automatic PLL power-down mode — activated when no rising edges are detected on the REF input — draws less than 25µA in the quiescent state, a meaningful power management feature in embedded industrial and defense systems where clock domains are selectively powered. For embedded computing, networking, and defense electronics programs requiring clock distribution with verified supply continuity, Sparkle Electronics maintains stock of the CY2309ZXI-1H for same-day response procurement. Contact Sparkle Electronics to confirm stock and request a quote.
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CY2309ZXI-1H In Stock: Procurement Considerations for Cypress Clock Distribution Silicon
Cypress clock buffer ICs are widely deployed components with supply characteristics that require active procurement management — allocation constraints, end-of-life transitions, and multi-source qualification gaps affect availability on a product lifecycle schedule that does not always align with production timelines. The CY2309ZXI-1H has a long deployment history in embedded computing and industrial networking applications, and Sparkle Electronics maintains verified stock for procurement teams requiring immediate availability, RFQ response, cross-reference support, or supply continuity planning for ongoing production schedules. Engineers and procurement professionals searching for CY2309ZXI-1H in stock, Cypress CY2309 clock buffer distributor, CY2309ZXI-1H pricing and lead time, or CY2309ZXI-1H datasheet and cross reference will find Sparkle Electronics maintains ready inventory with same-day response. Submit an inquiry for pricing and stock confirmation within 24 hours.
CY2309ZXI-1H vs. Related CY2309 Variants: Selecting the Correct Suffix
The CY2309 family uses a structured ordering suffix system that defines package, temperature grade, and drive strength. Understanding the suffix is essential for procurement cross-reference and substitution evaluation:
| Parameter | CY2309ZXI-1H | CY2309ZXI-1 | CY2309SXI-1H | CY2309CZXI-1H |
|---|---|---|---|---|
| Availability | In Stock at Sparkle | Confirm with Sparkle | Confirm with Sparkle | Confirm with Sparkle |
| Package | 16-TSSOP | 16-TSSOP | 16-SOIC | 16-TSSOP |
| Temperature | −40°C to +85°C | −40°C to +85°C | −40°C to +85°C | −40°C to +85°C |
| Drive Strength | High (-1H) | Standard (-1) | High (-1H) | High (-1H) |
| Max Frequency | 133MHz | 100MHz | 133MHz | 133MHz |
| Supply Voltage | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V | 3.0V to 3.6V |
| Output | LVCMOS | LVCMOS | LVCMOS | LVCMOS |
| Fanout | 1:9 | 1:9 | 1:9 | 1:9 |
The -1H suffix is not interchangeable with the -1 suffix in timing-critical applications: the higher drive strength of the -1H variant produces faster output edges and supports heavier capacitive loads, but may require additional attention to signal integrity on short traces where overshoot and ringing become design considerations. For 133MHz operation, the -1H is the required variant — the standard -1 devices are rated to 100MHz only.
On-Chip PLL Architecture: Zero Delay Without External Feedback Routing
The CY2309ZXI-1H’s PLL locks to the REF input and derives its feedback signal from the on-chip CLKOUT pad — the same output that drives the external clock load. Because the PLL actively compensates for the propagation delay through the device, the output clock edge aligns with the input reference edge within the specified 250ps input-to-output skew envelope. This zero-delay characteristic eliminates the insertion delay that passive clock buffers accumulate, making the CY2309ZXI-1H suitable for synchronous system designs where all clocked elements must receive edges within a tightly bounded window relative to the reference. The on-chip feedback path distinguishes the CY2309 from the CY2308, which requires the user to route an external feedback connection from a selected output back to the FBK pin — a layout requirement that the CY2309 eliminates entirely at the cost of reduced feedback configuration flexibility. For defense embedded systems, FPGA & CPLD designs, and industrial control boards where PCB layout simplicity and BOM reduction are priorities, the CY2309ZXI-1H’s internal feedback architecture is the lower-complexity procurement and design specification.
Frequently Asked Questions
What does CY2309ZXI-1H decode to?
CY = Cypress Semiconductor product prefix; 2309 = zero delay PLL clock buffer family, 9-output variant (2305 is the 5-output version); Z = TSSOP package type; X = RoHS/lead-free compliant; I = industrial temperature grade (−40°C to +85°C); -1H = high drive strength variant rated to 133MHz (standard -1 devices are rated to 100MHz).
Where can I buy CY2309ZXI-1H in stock?
Sparkle Electronics maintains stock of the CY2309ZXI-1H for immediate fulfillment. Contact our team for current pricing, available quantity, and confirmed lead time. Same-day response on RFQs — we supply embedded systems OEMs, defense subcontractors, and production procurement teams globally. Long-term supply agreements and supply continuity planning can be discussed at inquiry stage.
What is the difference between CY2309ZXI-1H and CY2309ZXI-1?
The -1H suffix designates the higher drive strength variant of the CY2309, rated for operation up to 133MHz. The standard -1 variant provides lower drive strength and is rated to 100MHz maximum. Both variants use the same 16-pin TSSOP package with industrial temperature grade. In systems operating at or above 100MHz, or driving heavy capacitive loads from each output, the -1H is the required specification — the -1 is not a valid substitute at 133MHz operating frequency.
Does the CY2309ZXI-1H support operation below 10MHz?
The specified input frequency range is 10MHz to 133MHz. Below 10MHz, PLL lock behavior is not guaranteed by the datasheet. For systems requiring clock distribution at frequencies below 10MHz, a passive fanout buffer without a PLL — or a configurable clock generator with lower frequency PLL range — is the appropriate specification. Contact Sparkle Electronics for cross-reference support to alternative devices if the 10MHz lower bound is a design constraint.
What cross-reference options exist for CY2309ZXI-1H?
Functional equivalents include the ICS9DB108 (IDT/Renesas) and similar 1:9 zero delay LVCMOS clock buffers from IDT, ON Semiconductor, and Texas Instruments. Pin-compatibility and parametric equivalence must be verified against the specific application’s timing budget, output drive requirements, and PCB footprint before substitution. Sparkle Electronics can support cross-reference inquiries and alternative sourcing evaluation — contact our team with your specific requirements and operating conditions.
What happens when the REF input is removed or stops toggling?
When no rising edges are detected on the REF input, the CY2309ZXI-1H PLL automatically enters power-down mode. In this state, all outputs are three-stated and the PLL is disabled, reducing total supply current to less than 25µA. Clock distribution resumes automatically when REF toggling resumes and the PLL re-locks to the reference. This behavior is useful in power-managed embedded systems where clock domains are selectively enabled, but must be accounted for in system startup sequencing to avoid undefined output states during PLL re-lock transients.
Is CY2309ZXI-1H suitable for defense or military embedded applications?
The CY2309ZXI-1H is an industrial-grade commercial device (−40°C to +85°C) — it does not carry MIL-SPEC screening or QPL qualification. For defense embedded computing applications operating within the −40°C to +85°C temperature envelope without MIL-SPEC procurement requirements, the CY2309ZXI-1H is applicable. For applications requiring operation below −40°C or above +85°C, or programs specifying MIL-STD-883 screened clock distribution components, alternative military-grade clock buffers should be evaluated. Contact Sparkle Electronics for sourcing support on screened or extended-temperature clock distribution alternatives.
Sourcing CY2309ZXI-1H for an embedded industrial or defense computing program? Sparkle Electronics maintains verified stock of Cypress clock distribution ICs for immediate fulfillment and supply continuity support. Submit an inquiry — same-day response on pricing, stock confirmation, lead time, and cross-reference assistance.
