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Semtech Corporation GS1535-CFUE3-LOS
- Part No.:
- GS1535-CFUE3-LOS
- Manufacturer:
- Semtech Corporation
- Category:
- Video Processing
- Package:
- 64-LQFP
- Datasheet:
-
GS1535-CFUE3-LOS.pdf
- Description:
- IC VIDEO RECLOCKER 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,727
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Product details
Overview
GS1535-CFUE3-LOS from Gennum is a multi-rate SMPTE-compliant serial digital reclocker IC designed to recover embedded clock and retime SD/HD-SDI video signals. It supports 143–1485 Mb/s data rates including SMPTE 292M (1.485 Gb/s), 259M (270 Mb/s), 344M, and DVB-ASI (270 Mb/s), features on-chip 50Ω differential input/output termination, and operates from a single 3.3V supply across 0°C to 70°C.
For engineers reviewing the GS1535-CFUE3-LOS datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world timing role definitions, confirmed pin functions, and validated alternative options for broadcast infrastructure design.
Technical Context
The GS1535-CFUE3-LOS implements a Slew-Rate Phase-Locked Loop (S-PLL) architecture with dual acquisition loops: a Frequency Acquisition (FA) loop for initial lock and a Phase Acquisition (PA) loop for jitter tracking. Its ring oscillator VCO is factory-trimmed to cover all SD/HD rates across voltage and temperature.
It integrates a 4:1 differential input multiplexer with on-chip 50Ω termination per channel, LVPECL-compatible outputs, and configurable bypass/mute logic. Lock detection (LD), SD/HD rate indication, and bi-directional SS[2:0] status pins provide real-time system feedback without external monitoring circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rates | 143, 177, 270, 360, 540, 1483.5, 1485 Mb/s - covers full SMPTE 259M/292M/344M and DVB-ASI standards. |
| Input Jitter Tolerance | 0.8 UI worst-case - ensures reliable lock under high-jitter cable-received SDI signals. |
| Output Additive Jitter | 0.02–0.13 UI (rate-dependent) - enables clean retiming for cascaded distribution or long-haul transmission. |
| Supply Voltage | 3.135–3.465 V - single 3.3V rail with ±5% tolerance simplifies power design in broadcast equipment. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade broadcast encoders, routers, and monitors. |
| Package | 64-pin LQFP (10 mm × 10 mm) - surface-mount compatible with standard PCB assembly processes. |
| Termination | On-chip 50Ω differential input/output - eliminates need for external resistors and reduces board space. |
Pinout & Package
GS1535-CFUE3-LOS is housed in a 64-pin LQFP package (JEDEC MS026, 10 mm × 10 mm) with exposed thermal pad. Pin assignments follow Gennum's standardized layout for HD-LINX II™ reclockers, supporting drop-in compatibility within Gennum's ecosystem.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DDI0–DDI3 (pairs) | Differential Serial Input Channels | Four independent SMPTE-compliant inputs; selected via DDI_SEL[1:0]; each with internal 50Ω termination to DDI_VTT. |
| DDO/DDO | Differential Serial Output | LVPECL-compatible retimed output; 1600 mVp-p differential swing into 100Ω; terminated via DDO_VTT. |
| AUTO/MAN | Mode Control Input | High = auto-detect mode (searches all supported rates); Low = manual mode (SS[2:0] sets fixed rate). |
| LD | Lock Detect Output | Active-HIGH signal confirms PLL lock; used for system status monitoring and failover control. |
| SD/HD | Rate Indication Output | Low = HD rate (1.485 Gb/s); High = SD rate (≤540 Mb/s); drives GS1528 slew-rate selection directly. |
| BYPASS / AUTOBYPASS | Bypass Control Inputs | BYPASS overrides AUTOBYPASS; both force transparent signal pass-through when PLL is unlocked or disabled. |
Key Features
| Feature | Design Value |
|---|---|
| SMPTE 292M/259M/344M compliance | Fully compliant with broadcast industry timing and electrical standards - enables drop-in integration into certified SDI infrastructure. |
| Auto/manual rate selection | Eliminates firmware dependency for rate detection; auto mode locks in ≤10 ms, manual mode fixes rate for deterministic latency. |
| On-chip 50Ω termination | Reduces BOM count by 8 resistors per channel and improves impedance matching stability over temperature and process variation. |
| Configurable mute/bypass behavior | DDO_MUTE silences output during lock loss without disrupting signal path; AUTOBYPASS maintains continuity during transient unlock events. |
| DVB-ASI support with ASI/177 pin | Disables false 177 Mb/s lock on K28.5 idle patterns - prevents mislock in ASI transport stream applications. |
Applications
| Broadcast Video Router | HD-SDI Distribution Amplifier |
|---|---|
|
Use Scenario: Reclocking SDI signals across 32×32 routing matrix with >10m cable runs and multiple fanouts. IC Role / Device Role / Timing Role: Retimer that removes accumulated jitter from upstream sources before redistribution, ensuring bit-error-free delivery to downstream receivers. Use Value: Enables stable locking at 1.485 Gb/s even after 5+ cascaded reclockers, meeting SMPTE 292M eye diagram mask requirements. |
Use Scenario: Fanout of one HD-SDI source to eight studio monitors with independent cable lengths and termination schemes. IC Role / Device Role / Timing Role: Jitter-cleaning reclocker with SD/HD output driving GS1528 slew-rate control to match cable impedance and length variations. Use Value: Maintains <0.13 UI additive jitter at 1.485 Gb/s, preserving eye opening margin across all eight outputs simultaneously. |
| Professional Camera Interface | DVB-ASI Transport Encoder |
|
Use Scenario: Integrating HD-SDI output from broadcast camera head into field production switcher with variable cable routing. IC Role / Device Role / Timing Role: Auto-rate reclocker with BYPASS fallback - locks to 1.485 Gb/s HD signal or passes through legacy SD if detected. Use Value: Eliminates need for manual rate switches; LD and SD/HD pins enable automatic format-aware signal conditioning. |
Use Scenario: Re-timing DVB-ASI transport streams from satellite demodulators before MPEG multiplexing. IC Role / Device Role / Timing Role: 270 Mb/s reclocker with ASI/177 pin asserted to suppress 177 Mb/s false lock on K28.5 sequences. Use Value: Guarantees stable lock on true ASI data without interruption from idle pattern harmonics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial digital reclocking applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GS1534-CFUE3 | Single-input (1:1) reclocker; no 4:1 mux; identical rate support and jitter performance. | Limited to point-to-point reclocking; unsuitable for multi-source routing or MUX-based systems. | Select when only one SDI source requires cleaning and board space is constrained. |
| LMH0384SQ/NOPB | Texas Instruments HD-SDI reclocker; supports 143–2970 Mb/s; includes integrated cable equalization. | Higher max rate (2.97 Gb/s) and built-in equalizer; no native DVB-ASI mode or ASI/177 pin. | Prefer for UHD/3G-SDI systems or where input signal degradation exceeds GS1535-CFUE3-LOS input sensitivity. |
Compared with GS1535-CFUE3-LOS, GS1534-CFUE3 reduces channel count but retains identical jitter cleanup capability, while LMH0384SQ/NOPB extends bandwidth and adds equalization at the cost of DVB-ASI-specific lock reliability and Gennum ecosystem interoperability.
Availability
GS1535-CFUE3-LOS is available at Aetrix Electronics and suitable for broadcast video routers, HD-SDI distribution amplifiers, professional camera interfaces, and DVB-ASI transport encoders requiring stable component supply across extended production lifecycles.
Supply support for GS1535-CFUE3-LOS 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
Gennum Corporation was a Canadian semiconductor company specializing in high-speed serial interface solutions for broadcast video, later acquired by Semtech in 2012. Its HD-LINX™ family defined industry-standard reclocking performance for SDI infrastructure.
The GS1535-CFUE3-LOS belongs to Gennum's HD-LINX II™ reclocker product line, engineered specifically for SMPTE-compliant jitter attenuation and multi-rate flexibility in professional video equipment.
FAQ
What data rates does the GS1535-CFUE3-LOS support?
The GS1535-CFUE3-LOS supports 143, 177, 270, 360, 540, 1483.5, and 1485 Mb/s - covering SMPTE 259M (SD), 292M (HD), 344M (dual-link HD), and DVB-ASI (270 Mb/s). Rate selection is automatic or manual via AUTO/MAN and SS[2:0] pins. The GS1535-CFUE3-LOS achieves lock in ≤10 ms in auto mode and maintains <0.13 UI additive jitter at 1485 Mb/s.
How does the GS1535-CFUE3-LOS handle DVB-ASI signals without false locking?
The GS1535-CFUE3-LOS uses the ASI/177 pin to disable 177 Mb/s detection during auto-rate search, preventing false lock on K28.5 idle pattern harmonics common in DVB-ASI transport streams. When ASI/177 is HIGH, the GS1535-CFUE3-LOS locks only to 270 Mb/s for ASI, ensuring stable operation without manual intervention or firmware tuning.
What is the function of the SD/HD output pin on the GS1535-CFUE3-LOS?
The SD/HD pin on the GS1535-CFUE3-LOS is an active-low indicator: LOW signifies lock at HD rates (1.485 Gb/s or 1.485/1.001 Gb/s), HIGH indicates SD rates (143–540 Mb/s). It directly controls the slew rate of the companion GS1528 cable driver, enabling dynamic signal integrity optimization based on detected video format - a key feature of the GS1535-CFUE3-LOS in mixed-format systems.
Can the GS1535-CFUE3-LOS operate without an external crystal?
No - the GS1535-CFUE3-LOS requires a 14.140 MHz ±50 ppm crystal connected to XTAL+/XTAL− pins for VCO centering and frequency acquisition. This crystal enables fast synchronous lock recovery after interruptions and stabilizes the PLL across temperature and voltage. The GO1535 crystal module from Gennum is specified for optimal GS1535-CFUE3-LOS performance.
What is the purpose of the DDO_MUTE pin on the GS1535-CFUE3-LOS?
The DDO_MUTE pin on the GS1535-CFUE3-LOS forces the retimed DDO/DDO outputs to a high-impedance muted state when LOW - but only during active reclocking (i.e., when LD = HIGH and bypass is disabled). It has no effect in BYPASS or AUTOBYPASS modes. This allows controlled blanking of outputs during system initialization or fault conditions without disrupting the signal path.
GS1535-CFUE3-LOS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- HD-LINX® II
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Reclocker
- Applications:
- Professional Video
- Standards:
- DVB-ASI, SMPTE
- Control Interface:
- Serial
- Voltage - Supply:
- 3.1V ~ 3.5V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 64-LQFP (10x10)
GS1535-CFUE3-LOS FAQ
1.How can I place an order for GS1535-CFUE3-LOS through Aetrix?
Please submit a Request for Quotation (RFQ) for GS1535-CFUE3-LOS 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 GS1535-CFUE3-LOS reliable?
The price and inventory of GS1535-CFUE3-LOS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GS1535-CFUE3-LOS is usually 5 days.
3.What payment methods are accepted for GS1535-CFUE3-LOS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GS1535-CFUE3-LOS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for GS1535-CFUE3-LOS?
GS1535-CFUE3-LOS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your GS1535-CFUE3-LOS 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 GS1535-CFUE3-LOS?
For technical support, including GS1535-CFUE3-LOS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GS1535-CFUE3-LOS requirements.
6.How does Aetrix verify that GS1535-CFUE3-LOS is sourced from the original manufacturer or authorized distributors?
All GS1535-CFUE3-LOS 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 GS1535-CFUE3-LOS meets industry standards.
7.What is the process for return or replacement of GS1535-CFUE3-LOS?
All GS1535-CFUE3-LOS units undergo pre-shipment inspection (PSI). If there is an issue with GS1535-CFUE3-LOS, 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 GS1535-CFUE3-LOS part is unused and in its original packaging.
Return procedure for GS1535-CFUE3-LOS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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