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Semtech Corporation GS1535-CFUE3
- Part No.:
- GS1535-CFUE3
- Manufacturer:
- Semtech Corporation
- Category:
- Video Processing
- Package:
- 64-LQFP
- Datasheet:
-
GS1535-CFUE3.pdf
- Description:
- IC VIDEO RECLOCKER 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,646
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Product details
Overview
GS1535-CFUE3 from Gennum is a multi-rate SMPTE-compliant serial digital reclocker IC designed for HD/SD-SDI signal regeneration in broadcast video infrastructure. It supports 143–1485 Mb/s data rates including SMPTE 292M (1.485 Gb/s), 259M (270 Mb/s), and 344M, features on-chip 50Ω differential input/output termination, LVPECL-compatible outputs, and operates from a single 3.3V supply across 0°C to 70°C.
For engineers reviewing the GS1535-CFUE3 datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world timing performance metrics, functional pin mapping, and validated alternative options for SDI retiming systems requiring jitter cleanup, rate adaptation, and seamless integration with GS1528 cable drivers.
Technical Context
The GS1535-CFUE3 implements a Slew-Rate Phase-Locked Loop (S-PLL) architecture with dual acquisition loops: a Frequency Acquisition (FA) loop for rapid lock detection across seven standard SDI/ASI rates, and a Phase Acquisition (PA) loop for precise jitter suppression during locked operation. Its ring oscillator VCO is factory-trimmed and programmable via dividers to cover all target rates without external tuning.
It integrates a 4:1 differential input multiplexer with on-chip 50Ω termination per channel, configurable auto/manual rate selection via AUTO/MAN and SS[2:0], and dedicated control pins (BYPASS, AUTOBYPASS, ASI/177, DDO_MUTE) enabling dynamic bypass, DVB-ASI mode exclusion, and output muting - all coordinated by internal logic that interfaces directly with GS1528 slew-rate drivers via SD/HD signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rates | 143, 177, 270, 360, 540, 1483.5, 1485 Mb/s - covers SMPTE 259M/292M/344M and DVB-ASI standards |
| Input Jitter Tolerance | 0.8 UI worst-case - ensures reliable lock under high-jitter SDI sources like long coax runs |
| Output Additive Jitter | 0.02–0.13 UI (rate-dependent) - enables clean re-timed signals meeting SMPTE eye mask requirements |
| Lock Time (Sync) | 0.16–0.29 µs - allows sub-microsecond recovery after signal interruption in live production |
| Supply Voltage | 3.135–3.465 V - single 3.3V rail simplifies power design and matches LQFP thermal profile |
| Operating Temp | 0°C to 70°C - qualified for commercial broadcast equipment enclosures without forced cooling |
| Package | 64-pin LQFP (10 mm × 10 mm) - JEDEC MS026 compliant, Pb-free/Green certified (E3 suffix) |
Pinout & Package
GS1535-CFUE3 uses a 64-pin LQFP package (JEDEC MS026, 10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Gennum DS18557-8 Rev. 8 (Feb 2005), including dedicated power domains (VCC_VCO, VCC_DDO, VCC_CP), differential I/O pairs (DDI0–DDI3, DDO), and control logic (AUTO/MAN, BYPASS, ASI/177).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DDI0–DDI3 (±) | Differential Serial Input Pairs | Four independent SDI/ASI input channels with on-chip 50Ω termination; selected via DDI_SEL[1:0] |
| DDO/DDO (±) | Differential Serial Output Pair | LVPECL-compatible retimed output; 1600 mVp-p into 100Ω, with DDO_VTT for termination bias |
| AUTO/MAN | Mode Control Input | High = auto-detect rate (SS[2:0] become outputs); Low = manual rate selection (SS[2:0] become inputs) |
| LD | Lock Detect Output | Active-HIGH signal confirms PLL lock; used for system status monitoring and fault handling |
| SD/HD | Standard Indication Output | Low = HD (1.485 Gb/s); High = SD (≤540 Mb/s); drives GS1528 slew-rate selection directly |
| ASI/177 | Rate Exclusion Input | High disables 177 Mb/s search to prevent false lock on DVB-ASI idle patterns (K28.5 harmonics) |
Key Features
| Feature | Design Value |
|---|---|
| Slew-Rate PLL Architecture | Non-linear ramp-phase response enables stable loop bandwidth independent of input transition density - critical for pathological SDI patterns |
| On-Chip Termination | Integrated 50Ω resistors per differential input/output pair eliminate external termination components and reduce board space |
| Auto Bypass on Loss-of-Lock | AUTOBYPASS pin enables transparent signal pass-through when PLL unlocks - maintains video continuity during transient interruptions |
| Configurable Mute/Bypass Logic | DDO_MUTE forces output mute only during active reclocking; no effect in bypass - prevents spurious output during mode transitions |
| Crystal Reference Interface | 14.140 MHz ±50 ppm XTAL+/- input stabilizes VCO center frequency; enables fast synchronous re-lock after signal dropout |
Applications
| Broadcast Video Routing Switcher | HDTV Camera Back-End Interface |
|---|---|
Use Scenario: Reclocking SDI signals between routing matrix stages to suppress accumulated jitter from multiple cable runs and distribution amplifiers. IC Role / Device Role / Timing Role: Multi-rate automatic reclocker restoring signal integrity before retransmission or format conversion. Use Value: Enables >10-hop SDI chain compliance with SMPTE 292M eye diagram masks by reducing additive jitter to ≤0.13 UI at 1.485 Gb/s. |
Use Scenario: Conditioning HD-SDI output from professional camera heads before transmission over long coaxial cables to control rooms. IC Role / Device Role / Timing Role: Jitter-cleaning retimer with SD/HD output driving GS1528 slew-rate selection for optimal cable drive. Use Value: Maintains signal fidelity over 100+ meter RG-6 cables by combining low-output-jitter reclocking with adaptive driver slew control. |
| Studio Monitor Distribution Hub | DVB-ASI Transport Stream Regenerator |
Use Scenario: Distributing synchronized HD/SD-SDI feeds to multiple on-set monitors while preserving lip-sync accuracy and color fidelity. IC Role / Device Role / Timing Role: Rate-adaptive reclocker with lock detect (LD) and standard indication (SD/HD) for system health monitoring. Use Value: Eliminates frame drops caused by timing drift between source and display by delivering sub-100 ps RMS jitter outputs. |
Use Scenario: Reconditioning DVB-ASI transport streams from satellite demodulators before MPEG multiplexing or conditional access insertion. IC Role / Device Role / Timing Role: 270 Mb/s reclocker with ASI/177 pin disabled to avoid false lock on K28.5 idle pattern harmonics. Use Value: Prevents ASI stream corruption by rejecting 177 Mb/s harmonic interference while maintaining <0.09 UI additive jitter at 270 Mb/s. |
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) variant; lacks 4:1 mux, DDI_SEL, and SD/HD output; identical PLL, jitter specs, and pin-compatible footprint | No multi-source switching or GS1528 slew-rate coordination; suitable only for point-to-point reclock paths | Select when system requires only one SDI input and simpler control logic - reduces BOM count but sacrifices flexibility |
| LMH0344SQ/NOPB | TI device with integrated cable equalizer; supports same SDI rates but uses CML outputs and different power domains (2.5V core + 3.3V I/O) | Enables longer cable reach without external equalization; requires separate 2.5V rail and layout changes for CML termination | Choose when coax run exceeds 100m and equalization is needed - adds functionality but increases power complexity and layout constraints |
Compared with GS1535-CFUE3, GS1534-CFUE3 removes input multiplexing and standard indication to simplify design for fixed-rate links, while LMH0344SQ/NOPB trades off standalone reclocking purity for integrated equalization - making GS1535-CFUE3 optimal for flexible, multi-source broadcast routing where jitter cleanup and GS1528 interoperability are primary goals.
Availability
GS1535-CFUE3 is available at Aetrix Electronics and suitable for broadcast video routing switchers, HDTV camera back-end interfaces, studio monitor distribution hubs, and DVB-ASI transport stream regenerators requiring stable component supply with full lifecycle support.
Supply support for GS1535-CFUE3 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 ICs for broadcast video, medical imaging, and data communications before its acquisition by Semtech in 2013.
The GS1535-CFUE3 belongs to Gennum's HD-LINX II™ family, engineered specifically for SMPTE-compliant SDI signal regeneration in professional video equipment - emphasizing low-jitter reclocking, multi-standard rate agility, and seamless interoperation with companion drivers like GS1528.
FAQ
What data rates does the GS1535-CFUE3 support, and how is rate selection handled?
The GS1535-CFUE3 supports 143, 177, 270, 360, 540, 1483.5, and 1485 Mb/s - covering SMPTE 259M, 292M, and 344M standards plus DVB-ASI. Rate selection is configurable via AUTO/MAN pin: in Auto mode, it detects incoming rate and reports via SS[2:0] outputs; in Manual mode, SS[2:0] serve as inputs to force a specific rate. The ASI/177 pin disables 177 Mb/s detection to prevent false lock on DVB-ASI idle patterns.
How does the GS1535-CFUE3 handle loss of lock, and what is the role of AUTOBYPASS?
When the GS1535-CFUE3 loses PLL lock, the LD output goes LOW. If AUTOBYPASS is asserted HIGH, the device automatically enters bypass mode - passing input data directly to DDO/DDO outputs without reclocking. This preserves signal continuity during transient interruptions. BYPASS pin provides manual override: when HIGH, it forces bypass regardless of lock status or AUTOBYPASS state, ensuring deterministic fail-safe behavior in mission-critical video paths.
What is the function of the SD/HD output pin on the GS1535-CFUE3, and how is it used?
The SD/HD pin on the GS1535-CFUE3 is an open-drain logic output indicating locked standard: LOW for HD rates (1.485 Gb/s or 1.485/1.001 Gb/s), HIGH for SD rates (143–540 Mb/s). Its primary design purpose is to control the slew rate of the companion GS1528 Dual Slew-Rate Cable Driver - enabling optimized drive strength matching for SD vs. HD cable lengths and impedance profiles without external logic.
Does the GS1535-CFUE3 require external termination resistors for its differential I/Os?
No - the GS1535-CFUE3 integrates on-chip 50Ω termination resistors for all differential inputs (DDI0–DDI3) and outputs (DDO/DDO). Each input pair connects to a center-tap pin (e.g., DDI0_VTT) where a 10 nF capacitor to ground completes the termination network. For outputs, DDO_VTT serves the same purpose. This eliminates discrete termination components, reduces PCB area, and ensures consistent 50Ω matching across temperature and process variation.
What crystal frequency is required for the GS1535-CFUE3, and why is tolerance critical?
The GS1535-CFUE3 requires a 14.140 MHz ±50 ppm fundamental-mode crystal connected to XTAL+/XTAL−. This reference stabilizes the VCO center frequency during unlock and enables fast synchronous re-lock after signal dropout. Tight tolerance ensures the FA loop maintains accurate frequency comparison across voltage and temperature - deviations beyond ±50 ppm risk extended lock times or failure to acquire valid SDI rates, especially at 1485 Mb/s where VCO division ratios are most sensitive.
GS1535-CFUE3 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 FAQ
1.How can I place an order for GS1535-CFUE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for GS1535-CFUE3 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 reliable?
The price and inventory of GS1535-CFUE3 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 is usually 5 days.
3.What payment methods are accepted for GS1535-CFUE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GS1535-CFUE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for GS1535-CFUE3?
GS1535-CFUE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your GS1535-CFUE3 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?
For technical support, including GS1535-CFUE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GS1535-CFUE3 requirements.
6.How does Aetrix verify that GS1535-CFUE3 is sourced from the original manufacturer or authorized distributors?
All GS1535-CFUE3 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 meets industry standards.
7.What is the process for return or replacement of GS1535-CFUE3?
All GS1535-CFUE3 units undergo pre-shipment inspection (PSI). If there is an issue with GS1535-CFUE3, 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 part is unused and in its original packaging.
Return procedure for GS1535-CFUE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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