CY23EP09SXI-1HT - 220MHz 9-Output Zero Delay Buffer | Infineon
MPN: CY23EP09SXI-1HT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.92 | $3.92 |
| 10 | $3.53 | $35.30 |
| 100 | $2.97 | $297.00 |
| 500 | $2.65 | $1,325.00 |
| 1,000 | $2.34 | $2,340.00 |
CY23EP09SXI-1HT Overview
A zero delay buffer (ZDB) is a type of clock fanout/distribution IC that uses a phase-locked loop (PLL) to ensure the output clock edges remain aligned with the input reference clock edge, achieving sub-nanosecond skew. ZDBs sit in the clock distribution hierarchy between a primary oscillator or PLL clock generator and the downstream loads (CPUs, FPGAs, ASICs, DDR memory, serializers). They belong to the broader clock-and-timing category of integrated circuits and are widely used to multiply clock fanout without introducing timing drift.
Key features of the CY23EP09SXI-1HT include 9 low-skew outputs, 45 ps typical output-to-output skew, an on-chip PLL with internal feedback, and a -1H higher-drive variant compared to standard -1 devices. The device supports industrial operating temperature ranges and is qualified for fanout buffer applications where low jitter and matched propagation delays are required across multiple loads.
The CY23EP09SXI-1HT is widely used in networking line cards, server motherboards, storage controllers, and telecommunications infrastructure as a clock distribution element. The 'I' suffix in the MPN denotes industrial temperature grade, while 'T' indicates Tape & Reel packaging. It is pin-compatible with the broader CY23EP09 family, allowing board designers to swap standard and -1H drive variants without layout changes.
When designing with this device, ensure the REF input clock meets the PLL lock range and that decoupling capacitors are placed close to VDD pins. Output load matching is critical to maintain skew performance across the nine outputs.
Drop-in alternatives for CY23EP09SXI-1HT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CY23EP09SXC-1HT
✅ Drop-In📋 Reference alternative (not in catalog)
CY23EP09SXI-1H
✅ Drop-In📋 Reference alternative (not in catalog)
CY23EP09SXC-1H
✅ Drop-In📋 Reference alternative (not in catalog)
CY23EP09SXI-1
✅ Drop-In📋 Reference alternative (not in catalog)
CY23EP09SXI-1HT Specifications
| Device Type | Zero Delay Buffer (Fanout Buffer / Distribution) |
| Number of Outputs | 9 |
| Output Type | LVCMOS/LVTTL-compatible |
| Supply Voltage | 2.5 V or 3.3 V (2.3 V to 3.6 V range) |
| Core Voltage | 2.5 V / 3.3 V |
| Frequency Range (3.3 V) | 10 MHz to 220 MHz |
| Frequency Range (2.5 V) | 10 MHz to 200 MHz |
| Output-to-Output Skew | 45 ps typical |
| Propagation Delay | Zero (adjustable via CLKOUT loading) |
| PLL | On-chip, locks to REF pin |
| Feedback | Internal, from CLKOUT pad |
| Drive Strength | Higher drive (-1H variant) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 16-pin SOIC (0.154", 3.90 mm width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel |
| RoHS Status | Compliant (Lead-free) |
| Origin | Cypress Semiconductor, acquired by Infineon |
CY23EP09SXI-1HT Pin Configuration
| Pin 1 | REF — Reference clock input to the on-chip PLL |
| Pin 2 | CLKOUT — Buffered clock output; internally fed back to the PLL |
| Pin 3 | CLK1 — Buffered clock output 1 |
| Pin 4 | CLK2 — Buffered clock output 2 |
| Pin 5 | GND — Ground |
| Pin 6 | CLK3 — Buffered clock output 3 |
| Pin 7 | CLK4 — Buffered clock output 4 |
| Pin 8 | CLK5 — Buffered clock output 5 |
| Pin 9 | GND — Ground |
| Pin 10 | CLK6 — Buffered clock output 6 |
| Pin 11 | CLK7 — Buffered clock output 7 |
| Pin 12 | CLK8 — Buffered clock output 8 |
| Pin 13 | VDD — Power supply (2.5V or 3.3V) |
| Pin 14 | CLK9 — Buffered clock output 9 |
| Pin 15 | S2 — Frequency select / strap input |
| Pin 16 | VDD — Power supply (2.5V or 3.3V) |
Typical Applications
CY23EP09SXI-1HT is suitable for 7 applications: Networking Line Card Clock Distribution, Server Motherboard Clock Fanout, Storage Controller / RAID Clock Tree, Telecommunications Infrastructure (T1/E1, DSLAM), Industrial Automation / PLC Backplane, Test and Measurement Equipment, FPGA-Based Embedded Designs.
Networking Line Card Clock Distribution
The CY23EP09SXI-1HT fits networking line-card clock distribution because its 10-220 MHz range at 3.3V and 9 low-skew outputs let a single reference clock feed multiple PHYs, switch ASICs, and FPGAs on the same PCB. Its on-chip PLL with internal feedback eliminates external feedback traces and reduces board complexity, while 45 ps typical output skew guarantees timing margin for GbE and 10GbE SerDes lanes. Designers commonly place the device adjacent to the primary clock oscillator and route matched-length traces to each load. The 16-SOIC footprint provides good thermal dissipation for continuous 220 MHz operation. Source: Infineon CY23EP09 datasheet.
Recommended
Server Motherboard Clock Fanout
The CY23EP09SXI-1HT is well matched to server motherboard clock fanout where a single 100-133 MHz reference must reach the CPU, chipset, DDR memory, and multiple PCIe slots. Its zero input-output propagation delay, achieved by on-chip PLL with internal CLKOUT-pad feedback, keeps all loads in phase with the source. Industrial temperature grade (-40C to +85C) supports rack-server ambient conditions, and the 16-SOIC footprint is compatible with dense server PCB layouts. The 9 outputs allow one part to replace several discrete fanout buffers, reducing BOM cost. Source: Infineon CY23EP09 datasheet.
Recommended
Storage Controller / RAID Clock Tree
The CY23EP09SXI-1HT suits storage controller and RAID card clock distribution because the device's 9 outputs can drive an SAS/SATA controller, an FPGA, ECC DRAM, and multiple flash channels from one reference. The 45 ps typical output-to-output skew preserves timing alignment between the controller and memory, critical for RAID write-cache coherency. The 3.3V supply is compatible with legacy storage designs, and the 16-SOIC package supports hand-rework in low-volume storage products. Source: Infineon CY23EP09 datasheet.
Recommended
Telecommunications Infrastructure (T1/E1, DSLAM)
The CY23EP09SXI-1HT is appropriate for telecom infrastructure such as DSLAMs and T1/E1 line cards where a stable low-jitter reference must fan out to multiple framers and DSP engines. Operating up to 220 MHz at 3.3V, it supports both legacy TDM clocks and faster packet-processing pipelines. The industrial temperature range ensures reliable operation in uncontrolled central-office environments. The 16-pin SOIC footprint simplifies optical line terminal (OLT) and DSLAM PCB designs where board space is constrained. Source: Infineon CY23EP09 datasheet.
Recommended
Industrial Automation / PLC Backplane
The CY23EP09SXI-1HT fits industrial PLC and automation backplane clock distribution because its industrial temperature grade (-40C to +85C) and robust 16-SOIC package tolerate factory-floor environments. The device's 9 outputs can clock a backplane MCU, multiple I/O modules, and isolated communication transceivers from a single reference. Zero propagation delay keeps distributed I/O modules phase-aligned with the central controller, critical for deterministic PLC scan times. The 2.5/3.3V supply options support both legacy 3.3V logic and newer 2.5V FPGAs. Source: Infineon CY23EP09 datasheet.
Recommended
Test and Measurement Equipment
The CY23EP09SXI-1HT is suitable for test and measurement instruments where a low-jitter reference clock must reach multiple ADC/DAC channels, FPGAs, and trigger logic. The 45 ps typical skew and zero delay performance ensure sample-clock alignment across parallel ADC lanes, directly impacting measurement accuracy and SNR. Operating at 220 MHz at 3.3V, it supports sampling-clock architectures for oscilloscopes and data-acquisition systems. The 16-pin SOIC package and industrial temperature grade fit benchtop and rack-mount equipment. Source: Infineon CY23EP09 datasheet.
Recommended
FPGA-Based Embedded Designs
The CY23EP09SXI-1HT supports FPGA-based embedded designs where one oscillator must feed multiple FPGA clock inputs, external memory, and companion ASSPs. Its on-chip PLL and internal feedback keep all FPGA clock pins phase-aligned, simplifying timing closure in the FPGA fabric. The 9 outputs can route to global clock buffers, SERDES reference clocks, and DDR PHYs without skew mismatch. The 16-SOIC footprint is compatible with hand-soldered prototype boards and small-batch production runs. Source: Infineon CY23EP09 datasheet.
Recommended
Recommended Products Summary
Engineering reference data for CY23EP09SXI-1HT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CY23EP09SXC-1HT | CY23EP09SXI-1H | CY23EP09SXC-1H | CY23EP09SXI-1 |
|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | 16-pin SOIC (0.154") | 16-pin SOIC (0.154") - same | 16-pin SOIC (0.154") - same | 16-pin SOIC (0.154") - same | 16-pin SOIC (0.154") - same |
| Number of Outputs | 9 | 9 | 9 | 9 | 9 |
| Frequency Range (3.3V) | 10-220 MHz | 10-220 MHz | 10-220 MHz | 10-220 MHz | 10-220 MHz |
| Output Skew (typical) | 45 ps | 45 ps | 45 ps | 45 ps | 45 ps |
| Drive Strength | Higher drive (-1H) | Higher drive (-1H) | Standard (-1) | Standard (-1) | Standard (-1) |
| Temperature Grade | Industrial (-40C to +85C) | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| PLL Feedback | Internal (from CLKOUT pad) | Internal (from CLKOUT pad) | Internal (from CLKOUT pad) | Internal (from CLKOUT pad) | Internal (from CLKOUT pad) |
Key Differentiators
- Higher-drive (-1H) output variant with industrial temperature grade (vs CY23EP09SXI-1H)
- Industrial temperature grade vs commercial in same package (vs CY23EP09SXC-1HT)
- Tape & Reel packaging for high-volume assembly (vs CY23EP09SXI-1 (Tube))
Design Notes
The CY23EP09SXI-1HT requires a clean 2.5V or 3.3V supply. Place a 0.1 uF decoupling capacitor as close as possible to each VDD pin (pins 13 and 16) and a bulk 10 uF tantalum or ceramic capacitor on the supply rail. The on-chip PLL is sensitive to supply noise; noisy rails will degrade jitter and increase output-to-output skew. Use a ferrite bead if the supply is shared with switching regulators. Source: Infineon CY23EP09 datasheet recommended decoupling section.
Route REF input away from the nine clock outputs to avoid coupling. Match output trace lengths when driving parallel loads to minimize additional skew beyond the device's 45 ps typical. The CLKOUT pin provides the internal PLL feedback and should be treated as an output only; do not load it excessively or the PLL may lose lock. Place ground vias adjacent to the GND pins (5 and 9) for low-impedance return paths. Per the Infineon CY23EP09 datasheet layout guidelines.
Common pitfalls include: (1) exceeding 220 MHz at 3.3V (will cause PLL unlock); (2) operating below 10 MHz reference (PLL lock range violated); (3) using long CLKOUT feedback traces externally - the device uses internal feedback, so CLKOUT is a buffered output, not an external feedback pin; (4) missing decoupling leading to high output jitter; (5) mismatched output loads causing greater than datasheet skew. Always verify PLL lock using a scope on the LOCK indicator behavior described in the Infineon CY23EP09 datasheet.
Compliance Information
RoHS compliant per Infineon product page. Lead-free SOIC package. Halogen-free status not explicitly stated in the verified data; manufacturer should be consulted for confirmation. Not AEC-Q100 qualified - this is an industrial-grade timing IC, not automotive.
