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Renesas TW3801-TC1-CR
- Part No.:
- TW3801-TC1-CR
- Manufacturer:
- Renesas
- Category:
- Specialized
- Package:
- 100-TQFP
- Datasheet:
-
TW3801-TC1-CR.pdf
- Description:
- IC INTERFACE SPECIALIZED 100TQFP
- Quantity:
- Payment:
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Product details
Overview
TW3801-TC1-CR from Intersil is a Security Link Over Coax (SLOC) transmitter IC for simultaneous analog CVBS and digital IP video transmission over single RG59 coaxial cable up to 500m. It integrates an AFE, digital modem, dual MII/RMII interfaces, and I²C control, serving as the camera-end encoder in SLOC-based surveillance systems.
For engineers reviewing the TW3801-TC1-CR datasheet, TW3801-TC1-CR pinout, TW3801-TC1-CR application, or TW3801-TC1-CR equivalent, this page delivers verified electrical specs, validated 100-TQFP pin mapping, confirmed SLOC protocol behavior, and real-world interface timing constraints for camera ISP and Ethernet PHY integration.
Technical Context
The TW3801-TC1-CR implements a proprietary SLOC physical layer that multiplexes 36Mbps downlink (TW3801→TW3811) and 4Mbps uplink over coax while preserving baseband CVBS video integrity. Its dual-mode MII/RMII interface supports both MAC-emulation (Mode A) and PHY-emulation (Mode B) configurations via MODE_S3 pin or register 0x01[3:2].
It embeds adaptive analog equalization for CVBS signal extension, a 25MHz crystal-referenced PLL, and integrated Reed-Solomon error monitoring (registers 0x27, 0x40–0x43). Power domains are strictly segregated: 1.8V core (VDD_D), 3.3V I/O (VDD_IO), and independent 3.3V analog rails (VDD_A, VDD_ADC, VDD_DRV, VDD_DAC, VDD_PLL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SLOC Downlink Speed | 36Mbps - maximum data rate from TW3801-TC1-CR to TW3811 receiver; required for full compatibility with all SLOC cameras. |
| SLOC Uplink Speed | 4Mbps - fixed uplink speed from TW3811 to TW3801-TC1-CR per SLOC compliance specification. |
| CVBS Input Range | 1.0–1.2Vpp - AC-coupled standard CVBS signal acceptance at CVBS_IN pin; supports 100IRE white pattern. |
| Video Bandwidth | 5.4MHz (-3dB) - preserved analog video bandwidth over 1m coax with IP data active; ensures NTSC/PAL fidelity. |
| Supply Voltages | VDD_D = 1.6–2.0V (1.8V typical); VDD_IO = 3.0–3.6V (3.3V typical); all analog supplies = 3.0–3.6V - strict rail separation prevents noise coupling. |
| Operating Temperature | -40°C to +85°C - industrial-grade thermal range validated for outdoor camera enclosures and DVR chassis. |
| Package | 100-pin TQFP (12mm × 12mm, Pb-free, Q100.12X12A) - surface-mount package with exposed thermal pad; θJA = 41°C/W. |
Pinout & Package
Package: 100-pin TQFP (12mm × 12mm), RoHS-compliant, Pb-free, moisture sensitivity level (MSL) per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CVBS_IN (77) | Analog Video Input | Accepts 1Vpp CVBS signal; requires AC coupling and 75Ω termination; feeds internal AFE and SLOC encoder path. |
| COAX_OUT (67) | Analog SLOC Output | High-impedance current-source output; must be terminated with 75Ω resistor + 150nH inductor to VSS_A per Figure 1. |
| LOAD_DRV (66) | Driver Reference Load | Generates mirrored output current for COAX_OUT; requires 75Ω, 1% resistor to ground on PCB bottom layer. |
| MII/RMII Interface Pins (e.g., RX_D0A–RX_D3A, TX_D0A–TX_D3A, RX_CLKA, TX_CLKA, etc.) | Digital Ethernet Interface | Configurable for Mode A (MAC emulation) or Mode B (PHY emulation); supports MII (25MHz) or RMII (50MHz) clocking. |
| I²C Interface (SDA, SCLK, A0, A1) | Configuration & Control Bus | Open-drain SDA (94), input SCLK (97); A0/A1 (56/57) set LSBs of MDIO PHY address; enables register-level SLOC setup. |
| XTAL_IN / XTAL_OUT (84/85) | Crystal Oscillator Interface | Drives 25MHz ±50ppm fundamental-mode crystal; provides reference for PLL and all digital timing domains. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous CVBS + IP over coax | Enables legacy analog video preview and modern IP streaming on one RG59 cable-eliminates dual-cable runs in retrofit installations. |
| Proprietary adaptive analog equalizer | Extends usable CVBS reach beyond 500m by compensating for coax frequency-dependent loss without external components. |
| Dual MII/RMII interface modes | Supports direct connection to either Ethernet PHY (Mode A) or SoC/MAC (Mode B), enabling flexible integration in camera or edge-converter designs. |
| Integrated Reed-Solomon error monitoring | Real-time link health visibility via registers 0x40–0x43; allows firmware to trigger diagnostics or failover when error counts exceed thresholds. |
| Full-duplex 100BASE-T SLOC link | Provides deterministic 36Mbps downlink and 4Mbps uplink-guarantees bandwidth for HD video transport and bidirectional control signaling. |
Applications
| IP Camera Integration | Coax-to-IP Video Converter |
|---|---|
|
Use Scenario: Embedding into HD security cameras to transmit both live CVBS preview and encoded IP video over existing coax infrastructure. IC Role / Device Role / Timing Role: TW3801-TC1-CR acts as the SLOC encoder, accepting CVBS from image sensor pipeline and MII data from ISP, then generating composite SLOC waveform. Use Value: Enables OEMs to reuse legacy coax cabling while adding IP functionality-reducing BOM cost and field installation time by >40% vs. dual-cable solutions. |
Use Scenario: Standalone module converting analog CCTV camera output and Ethernet stream into SLOC signal for long-haul coax transmission to DVR/NVR. IC Role / Device Role / Timing Role: TW3801-TC1-CR serves as protocol bridge, synchronizing CVBS sampling and Ethernet frame timing to maintain sub-frame latency (<1ms). Use Value: Delivers plug-and-play upgrade path for analog-only sites-no camera replacement needed; maintains CVBS monitor compatibility during IP migration. |
| SLOC-Based DVR Front-End | Multi-Channel SLOC Transmitter System |
|
Use Scenario: Integrating into DVR chassis to accept SLOC inputs from multiple cameras and demultiplex CVBS and IP streams locally. IC Role / Device Role / Timing Role: TW3801-TC1-CR operates as the transmit-side endpoint in point-to-point SLOC link; its status registers (0x44) feed host MCU for link health reporting. Use Value: Provides deterministic 5.4MHz CVBS bandwidth and 52.5dB SNR-ensures forensic-grade video quality even under heavy IP traffic load. |
Use Scenario: Used in multi-channel SLOC transmitter boards where multiple TW3801-TC1-CR devices share common 25MHz crystal and I²C bus. IC Role / Device Role / Timing Role: TW3801-TC1-CR functions as synchronized SLOC channel encoder; MODE_S0/S1 pins or register 0x0A configure identical bitrate across channels. Use Value: Enables scalable channel density (e.g., 4× TW3801-TC1-CR per board) with shared clock tree-reduces jitter accumulation and simplifies layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SLOC transmitter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TW3801-TC1-CR-EVAL | Evaluation board (not IC); includes TW3801-TC1-CR, reference circuitry, coax connectors, and test points. | Used for lab validation and firmware development-not for production embedding. | Select TW3801-TC1-CR for volume camera or converter designs; use TW3801-TC1-CR-EVAL only for bring-up and interoperability testing. |
| TW3811-TC1-CR | Complementary SLOC receiver IC; accepts coax input, outputs separate CVBS and Ethernet MII/RMII streams. | Must be paired with TW3801-TC1-CR in full SLOC link; not interchangeable as transmitter. | TW3801-TC1-CR and TW3811-TC1-CR form a matched transceiver pair-both required for end-to-end SLOC system deployment. |
Compared with TW3801-TC1-CR-EVAL (evaluation hardware) and TW3811-TC1-CR (receiver-only), the TW3801-TC1-CR is the sole production-grade SLOC transmitter IC capable of encoding CVBS + IP into coax; no drop-in alternatives exist for this specific transmitter function.
Availability
TW3801-TC1-CR is available at Aetrix Electronics and suitable for IP camera manufacturing, coax-to-IP video converter design, and SLOC-based DVR front-end development requiring stable component supply and long-term industrial availability.
Supply support for TW3801-TC1-CR 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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, automotive, and communications markets.
The TW3801-TC1-CR belongs to Intersil's SLOC™ product line, engineered specifically for hybrid analog/digital video transmission over coax in security surveillance systems-enabling cost-effective migration from legacy analog to IP infrastructure.
FAQ
What is the primary function of the TW3801-TC1-CR in a security video system?
The TW3801-TC1-CR is a Security Link Over Coax (SLOC) transmitter IC that encodes both analog CVBS video and digital IP video into a single composite signal for transmission over RG59 coaxial cable up to 500m. In a security video system, the TW3801-TC1-CR serves as the camera-end encoder-accepting CVBS from the image sensor and Ethernet data from the ISP, then generating the SLOC waveform for downstream reception by a TW3811-TC1-CR.
Does the TW3801-TC1-CR support both MII and RMII Ethernet interfaces, and how is the mode selected?
Yes, the TW3801-TC1-CR supports both MII (25MHz) and RMII (50MHz) interfaces via configurable Mode A (MAC emulation) or Mode B (PHY emulation). Selection is controlled by register 0x01[5] (Interface Selection) and register 0x01[6] (RMII Clock Source), or by the LED_0/MII_Mode_Select pin (53) at power-on when register 0x01[0] = 0. The TW3801-TC1-CR does not auto-negotiate; configuration must be explicitly set before link establishment.
What is the maximum coaxial cable distance supported by the TW3801-TC1-CR, and what factors affect it?
The TW3801-TC1-CR supports up to 500m over standard RG59 coaxial cable when operating at its default 36Mbps downlink speed. Distance is affected by coax quality (characteristic impedance, attenuation), ambient EMI, and CVBS signal integrity-particularly high-frequency roll-off. The device's proprietary adaptive analog equalizer helps extend usable CVBS reach, but actual performance must be validated per installation using the TW3801-TC1-CR's Reed-Solomon error counters (registers 0x40–0x43).
How is the SLOC link bitrate configured for the TW3801-TC1-CR, and why is 36Mbps recommended?
Bitrate is configured either by MODE_S0/MODE_S1 pins (when register 0x01[0] = 0) or by register 0x0A (when register 0x01[0] = 1). Valid settings are 21, 25, 28, or 36Mbps. The datasheet explicitly states that 36Mbps is required for maximum compatibility with all cameras; lower bitrates increase buffer overflow risk without meaningfully extending cable distance. Thus, TW3801-TC1-CR should always be configured for 36Mbps in production designs.
Can the TW3801-TC1-CR operate without an external crystal, and what are the clock requirements?
No, the TW3801-TC1-CR requires a 25MHz ±50ppm fundamental-mode crystal connected to XTAL_IN (84) and XTAL_OUT (85) pins. This crystal drives the internal PLL, which generates all digital and analog timing domains-including MII/RMII clocks, ADC/DAC sampling, and SLOC modulation. No external clock source or oscillator substitute is supported; omission or incorrect crystal loading (e.g., wrong capacitor value) will prevent functional operation of the TW3801-TC1-CR.
TW3801-TC1-CR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 100-TQFP
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Security Systems
- Interface:
- MII, RMII
- Voltage - Supply:
- 1.8V, 3.3V
- Supplier Device Package:
- 100-TQFP (12x12)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
TW3801-TC1-CR FAQ
1.How can I place an order for TW3801-TC1-CR through Aetrix?
Please submit a Request for Quotation (RFQ) for TW3801-TC1-CR 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 TW3801-TC1-CR reliable?
The price and inventory of TW3801-TC1-CR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TW3801-TC1-CR is usually 5 days.
3.What payment methods are accepted for TW3801-TC1-CR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TW3801-TC1-CR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TW3801-TC1-CR?
TW3801-TC1-CR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TW3801-TC1-CR 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 TW3801-TC1-CR?
For technical support, including TW3801-TC1-CR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TW3801-TC1-CR requirements.
6.How does Aetrix verify that TW3801-TC1-CR is sourced from the original manufacturer or authorized distributors?
All TW3801-TC1-CR 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 TW3801-TC1-CR meets industry standards.
7.What is the process for return or replacement of TW3801-TC1-CR?
All TW3801-TC1-CR units undergo pre-shipment inspection (PSI). If there is an issue with TW3801-TC1-CR, 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 TW3801-TC1-CR part is unused and in its original packaging.
Return procedure for TW3801-TC1-CR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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