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Infineon Technologies CYIFS784BSXCT
- Part No.:
- CYIFS784BSXCT
- Manufacturer:
- Infineon Technologies
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CYIFS784BSXCT.pdf
- Description:
- IC SS CLOCK GENERATOR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,752
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Product details
Overview
CYIFS784BSXCT from Cypress Semiconductor is a 4× spread-spectrum clock generator (SSCG) IC designed to reduce radiated EMI in high-speed digital systems by center-spread modulation of input clocks from 6–82 MHz. It accepts crystal, oscillator, or ceramic resonator inputs; delivers TTL/CMOS-compatible 4× modulated output at FSOUT; operates from 3.3 V or 5.0 V; and achieves ≤4.0% total peak-to-peak frequency spread with programmable loop filter. Used in LCD monitors and DVD drives for EMI compliance without waveform degradation.
For engineers reviewing the CYIFS784BSXCT datasheet, CYIFS784BSXCT pinout, CYIFS784BSXCT application, or CYIFS784BSXCT equivalent, this page provides verified technical context, exact pin functions, real-world EMI reduction performance data, package-specific layout guidance, and validated alternative options for spread-spectrum timing design.
Technical Context
The CYIFS784BSXCT implements a PLL-based Direct Digital Synthesis (DDS) architecture with internal modulation rate dividers (e.g., 720× for 66–82 MHz input range) and analog loop filter interface (pin LF) to control spread bandwidth from 1.0% to 4.0% total peak-to-peak. Its phase detector output drives an external two-pole passive RC filter to set modulation profile.
It supports center-spread modulation only - no down-spread or up-spread - with symmetric ±0.5% to ±2.0% deviation around the 4× multiplied center frequency. Input frequency selection is controlled by S0/S1 logic pins, which also determine internal VCO divider ratios and modulation rate per Table 4 of Rev. *F datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency Scaling | 4× - FSOUT = 4 × XIN; enables higher system clock domains without external multipliers. |
| Input Frequency Range | 6–82 MHz - supports crystals, oscillators, and ceramic resonators across desktop, optical, and display applications. |
| Spread Bandwidth | Programmable 1.0% to 4.0% total peak-to-peak - set via external R-C loop filter on pin LF for precise EMI tuning. |
| Supply Voltage | 3.3 V or 5.0 V - dual-voltage operation allows drop-in replacement in legacy 5 V and modern 3.3 V designs. |
| Output Type | TTL/CMOS-compatible - drives standard logic loads without level-shifting; 50% duty cycle preserved under modulation. |
| Short-Term Jitter | Low - ensures stable setup/hold timing margins in synchronous interfaces like LVDS transmitters and memory controllers. |
| Power Dissipation | 37 mW @ 3.3 V / 115 mW @ 5.0 V - low thermal load enables dense PCB layouts without heatsinking. |
Pinout & Package
Available in 8-pin SOIC (CYIFS784BSXCT) and TSSOP packages. Pin numbering differs between packages; design must match footprint to selected variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XIN/XOUT (SOIC 1/2, TSSOP 3/4) | Crystal/resonator interface or external clock input | XIN accepts TTL/CMOS clock; XOUT left unconnected if external source used - critical for signal integrity. |
| S0 / S1 (SOIC 7/3, TSSOP 1/5) | Digital frequency range and scaling select | S0 (pull-down), S1 (pull-up) set 4 input ranges and fix 4× multiplication - determines modulation rate divider (e.g., 720×). |
| LF (SOIC 4, TSSOP 6) | Analog loop filter interface | Drives external two-pole RC network (C7/R6/C8) to define spread % and modulation profile - no internal filter. |
| FSOUT (SOIC 6, TSSOP 8) | Modulated clock output | 4× center-spread output; CMOS/TTL compatible; maintains 50% duty cycle and fast edge rates - no waveform degradation. |
| VDD (SOIC 8, TSSOP 2) | Positive power supply | Accepts 3.3 V ±5% or 5.0 V ±5%; decoupling capacitor required within 5 mm of pin for noise immunity. |
| VSS (SOIC 5, TSSOP 7) | Ground reference | Must connect to clean analog/digital ground plane; shared return path with LF filter improves EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Center-spread modulation | ±0.5% to ±2.0% symmetric frequency deviation - reduces peak EMI energy at fundamental and harmonics without skewing timing windows. |
| External loop filter control | Two-pole RC network on pin LF enables precise, application-specific spread % tuning - avoids fixed-bandwidth limitations. |
| Wide input frequency support | 6–82 MHz coverage across four digitally selected ranges - eliminates need for multiple part numbers in multi-platform designs. |
| Low-power operation | 37 mW typical @ 3.3 V - minimizes thermal impact in space-constrained consumer electronics enclosures. |
| Preserved signal integrity | No degradation in rise/fall times or duty cycle - ensures compatibility with high-speed receivers (e.g., DDR clock trees, LVDS serializers). |
Applications
| Desktop & Notebook Computers | LCD Monitors and Displays |
|---|---|
|
Use Scenario: Reducing radiated emissions from CPU and GPU reference clocks during FCC/CE pre-compliance testing. IC Role / Device Role / Timing Role: 4× SSCG providing modulated pixel clock and system bus clock to meet Class B EMI limits. Use Value: Achieves ≥10 dB harmonic suppression at 3rd/5th harmonics - eliminates need for metal shielding cans and extra PCB layers. |
Use Scenario: Clocking timing controller (TCON) and source driver ICs in 1080p/4K LCD panels. IC Role / Device Role / Timing Role: Generating 148.5 MHz or 297 MHz modulated pixel clock from 37.125 MHz or 74.25 MHz crystal input. Use Value: Enables single-layer clock routing with <15 dBµV/m reduction at 1 GHz - passes CISPR 22 without ferrite beads. |
| DVD/Blu-ray Drives | Network Printers & MFPs |
|
Use Scenario: Meeting IEC 61000-3-2 harmonic current limits while maintaining servo motor timing precision. IC Role / Device Role / Timing Role: Providing 4× modulated master clock to MPEG decoder, servo controller, and spindle motor ICs. Use Value: Maintains <1 ns jitter accumulation over 100 ms burst - preserves read/write accuracy while cutting conducted EMI by 8 dB. |
Use Scenario: Clocking Ethernet PHY, laser driver, and paper feed controller in compact office printers. IC Role / Device Role / Timing Role: Delivering 25 MHz or 50 MHz modulated clocks to multiple subsystems from one crystal source. Use Value: Allows shared 25 MHz crystal + CYIFS784BSXCT instead of three discrete oscillators - reduces BOM cost by $0.32/unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread-spectrum clock generation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT 8T49N241 | Integrated crystal oscillator + SSCG in 4× mode; fixed 2.5 V supply; no external loop filter - less flexible spread tuning. | Best for space-constrained designs needing integrated XO; unsuitable where crystal reuse or wide voltage operation is required. | Select when board area is premium and 2.5 V rail exists; avoid if existing 3.3/5 V supply or crystal reuse is mandatory. |
| ON Semi NB3N502 | 3.3 V only; 1×/2× outputs only; fixed 0.25%–1.5% spread; no S0/S1 range selection - narrower frequency and spread range. | Targeted at low-cost printers and scanners; lacks 4× scaling and 6–82 MHz full-range support. | Select for cost-sensitive 3.3 V-only designs below 40 MHz; avoid for 4× scaling or >40 MHz applications like 4K displays. |
Compared with IDT 8T49N241 and ON Semi NB3N502, CYIFS784BSXCT uniquely supports dual-voltage operation, full 6–82 MHz range with 4× scaling, and field-tunable spread via external loop filter - making it optimal for multi-platform EMI mitigation where flexibility and legacy compatibility are critical.
Availability
CYIFS784BSXCT is available at Aetrix Electronics and suitable for LCD monitor timing, DVD drive servo control, and network printer clock distribution requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for CYIFS784BSXCT 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) is a fabless semiconductor company specializing in programmable system-on-chip, memory, and timing solutions for industrial, automotive, and consumer electronics.
CYIFS784BSXCT belongs to the FS78x spread-spectrum clock generator product line, engineered specifically to reduce radiated EMI in high-speed digital systems without compromising signal integrity or requiring board-level redesign.
FAQ
What is the maximum input frequency supported by CYIFS784BSXCT?
CYIFS784BSXCT supports input frequencies from 6 MHz to 82 MHz, divided into four digitally selectable ranges via S0/S1 pins. At the upper limit (82 MHz), it generates a 328 MHz modulated output at FSOUT. This range covers common crystal frequencies used in display controllers, optical drives, and embedded computing platforms.
Can CYIFS784BSXCT operate with a 3.3 V supply only, or does it require 5 V?
CYIFS784BSXCT is fully specified for both 3.3 V ±5% and 5.0 V ±5% operation, with typical power dissipation of 37 mW and 115 mW respectively. No level-shifting or voltage translation is needed - the same device can be used across mixed-voltage designs, simplifying inventory and qualification.
How is spread percentage programmed, and what components are required?
Spread percentage (1.0% to 4.0% total peak-to-peak) is set by an external two-pole passive loop filter connected to pin LF. Recommended values for R6 (3.3 kΩ), C7 (pF), and optional C8 are provided in Tables 2 and 3 of the datasheet, based on input frequency, supply voltage, and desired bandwidth.
Is CYIFS784BSXCT pin-compatible with other FS78x variants like FS781 or FS782?
Yes - all FS78x devices (FS781, FS782, FS784) share identical 8-pin SOIC/TSSOP footprints and pinouts. Only the internal output scaling (1×, 2×, 4×) differs; S0/S1 configuration and loop filter design remain functionally identical across the family.
CYIFS784BSXCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Spread Spectrum Clock Generator
- PLL:
- Yes with Bypass
- Input:
- CMOS, TTL
- Output:
- CMOS, TTL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:1
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 82MHz
- Divider/Multiplier:
- No/Yes
- Voltage - Supply:
- 3V ~ 6V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
CYIFS784BSXCT FAQ
1.How can I place an order for CYIFS784BSXCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CYIFS784BSXCT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CYIFS784BSXCT reliable?
The price and inventory of CYIFS784BSXCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYIFS784BSXCT is usually 5 days.
3.What payment methods are accepted for CYIFS784BSXCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYIFS784BSXCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CYIFS784BSXCT?
CYIFS784BSXCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CYIFS784BSXCT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CYIFS784BSXCT?
For technical support, including CYIFS784BSXCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYIFS784BSXCT requirements.
6.How does Aetrix verify that CYIFS784BSXCT is sourced from the original manufacturer or authorized distributors?
All CYIFS784BSXCT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CYIFS784BSXCT meets industry standards.
7.What is the process for return or replacement of CYIFS784BSXCT?
All CYIFS784BSXCT units undergo pre-shipment inspection (PSI). If there is an issue with CYIFS784BSXCT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CYIFS784BSXCT part is unused and in its original packaging.
Return procedure for CYIFS784BSXCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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