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Texas Instruments TMDS341APFC
- Part No.:
- TMDS341APFC
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 80-TQFP
- Datasheet:
-
TMDS341APFC.pdf
- Description:
- IC INTERFACE SPECIALIZED 80TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,652
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Product details
Overview
TMDS341APFC from Texas Instruments is a 3-to-1 DVI/HDMI switch IC for digital video routing in consumer AV systems. It supports up to 2.25 Gbps signaling, 80-pin TQFP package, 3.3-V operation, HDMI 1.3a compliance, and integrated 8-dB input equalization for 5-m cable compensation - deployed in digital TV, audio/video receivers, and game machines.
For engineers reviewing the TMDS341APFC datasheet, TMDS341APFC pinout, TMDS341APFC application, or TMDS341APFC equivalent, key selection criteria include TMDS channel count (3 inputs × 4 channels), hot-plug detector isolation per port, DDC bus pass-through logic, output de-emphasis control (PRE pin), and TMDS differential skew specs (<100 ps inter-pair, <50 ps intra-pair).
Technical Context
The TMDS341APFC implements a 3:1 multiplexer architecture with independent TMDS receiver stages per port, each featuring fixed 8-dB equalization and integrated 50-Ω termination. Its control logic routes selected TMDS data, DDC (I²C) signals, and HPD status while isolating unused ports' DDC buses and pulling HPD outputs low.
It uses LVTTL-compatible digital control (S1/S2/S3, OE, PRE) and supports 5-V-tolerant DDC/HPD_SINK pins. Output drive complies with TMDS voltage swing (400–600 mV single-ended) via external VSADJ resistor (4.64 kΩ), and enables high-impedance outputs when OE = high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Signaling Rate | Up to 2.25 Gbps - supports 1080i/p and 720p at 12-bit color depth |
| Supply Voltage | 3.3 V (3.0–3.6 V range) - requires local 0.01-µF bypass per VCC pin |
| Input Equalization | Fixed 8-dB - compensates ISI loss in 5-m 28-AWG DVI/HDMI cables |
| Differential Skew | Intra-pair <50 ps, inter-pair <100 ps - ensures pixel-level timing integrity across channels |
| DDC Interface | Bi-directional I²C pass gate with 5-V tolerance - eliminates level-shifter requirement |
| ESD Protection | HBM ≥5 kV on TMDS inputs - meets robustness requirements for consumer AV interfaces |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade digital display applications |
Pinout & Package
Package: 80-pin TQFP (PFC), 12 mm × 12 mm, 0.5-mm pitch, RoHS-compliant and 260°C reflow rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A11–A14, A21–A24, A31–A34 | TMDS positive inputs (Port 1–3) | Accept differential video/audio data; each pair requires 100-Ω controlled-impedance routing |
| B11–B14, B21–B24, B31–B34 | TMDS negative inputs (Port 1–3) | Complement to A-pins; internal 50-Ω termination to VCC eliminates external resistors |
| Y1–Y4, Z1–Z4 | TMDS positive/negative outputs | Deliver switched TMDS stream; output impedance controlled by VSADJ resistor and OE state |
| S1, S2, S3 | Source select inputs | LVTTL logic selects active port (see Table 1); "LLL" disables all outputs (high-Z) |
| OE | Output enable (active low) | Drives Y/Z outputs to high-Z when high - enables power-gated sink-side termination |
| HPD1–HPD3, HPD_SINK | Hot-plug detect I/O | Open-drain outputs (Ports 1–3); HPD_SINK is 5-V tolerant input for sink EDID readiness detection |
| SCL1–SCL3, SDA1–SDA3, SCL_SINK, SDA_SINK | DDC I²C interface | Bi-directional pass gates isolate unused ports; support standard-mode (100 kHz) I²C without level shifters |
| VSADJ | Voltage swing adjustment | Connects to ground via 4.64-kΩ precision resistor to set compliant TMDS differential output (560–840 mVpp) |
| PRE | Output de-emphasis control | High = 3-dB pre-emphasis; Low = 0-dB - optimizes signal integrity over long PCB traces or cables |
Key Features
| Feature | Design Value |
|---|---|
| 3-port HDMI/DVI switching | Enables single-display aggregation of three independent sources without protocol translation or firmware |
| Isolated DDC buses | Prevents I²C bus contention between unselected sources - critical for EDID handshake reliability |
| Integrated TMDS termination | Eliminates 12 external 50-Ω resistors; reduces BOM count and layout complexity |
| 5-V tolerant HPD/SDA/SCL pins | Direct connection to HDMI source/sink connectors without external clamping or level-shifting circuitry |
| 80-ps max inter-pair skew | Maintains pixel clock alignment across four TMDS channels - essential for 1080p/12-bit color fidelity |
| 190–230 mA supply current | Enables thermal design within 80-TQFP power dissipation limits (≤657 mW at 25°C) |
Applications
| Home Theater AV Receiver | Digital Television Set-Top Box |
|---|---|
Use Scenario: Aggregating HDMI outputs from Blu-ray player, game console, and streaming stick into one HDMI input of an AV receiver. IC Role / Device Role / Timing Role: 3-to-1 TMDS switch with isolated DDC buses and HPD passthrough - preserves EDID negotiation and hot-plug detection per source. Use Value: Enables seamless source switching without manual EDID re-reads or display blanking; supports 2.25 Gbps for lossless 1080p60 12-bit RGB. | Use Scenario: Integrating multiple HDMI inputs (cable box, USB media player, built-in tuner) into a single SoC-based digital TV platform. IC Role / Device Role / Timing Role: Front-end video switch with integrated TMDS termination and 8-dB equalization - extends reach over internal 10-cm PCB traces. Use Value: Reduces signal integrity margin loss by >6 dB at 1 GHz; eliminates need for external equalizers or repeaters. |
| Professional Digital Projector | Gaming Console Docking Station |
Use Scenario: Supporting simultaneous HDMI inputs from PC, Mac, and conference room laptop in a presentation projector with auto-input detection. IC Role / Device Role / Timing Role: Source selector with independent HPD monitoring and DDC isolation - prevents false plug/unplug events during multi-source arbitration. Use Value: Ensures stable EDID handshaking across all inputs; intra-pair skew <50 ps maintains pixel-clock jitter below 0.1 UI for 1080p120. | Use Scenario: Routing HDMI output from Nintendo Switch or PlayStation portable mode to external monitor while maintaining audio/video sync. IC Role / Device Role / Timing Role: Low-latency TMDS switch with <10 ns select-to-output delay and 5-V-tolerant DDC - preserves CEC and ARC compatibility. Use Value: Enables sub-frame latency switching (<1 video line); PRE pin allows 3-dB de-emphasis to compensate for dock-to-monitor cable losses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DVI/HDMI switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TMDS341BPFC | Same pinout and function; supports extended temperature range (–40°C to 85°C) and enhanced ESD (HBM 8 kV) | Required for industrial or automotive infotainment displays operating beyond 70°C ambient | Select TMDS341BPFC when extended temp or higher ESD immunity is mandatory; otherwise TMDS341APFC suffices for commercial AV gear |
| ON Semiconductor NB7L573MNR2G | 3:1 LVDS/PECL switch; no integrated DDC/HPD logic or TMDS equalization; 3.3-V only; no 5-V tolerance | Used in non-HDMI protocols (e.g., DisplayPort alternate mode, custom LVDS panels) where DDC passthrough is handled externally | Choose NB7L573MNR2G only for non-HDMI systems requiring ultra-low jitter (<15 ps) and no DDC integration; not drop-in compatible |
Compared with TMDS341BPFC, the TMDS341APFC offers lower cost and sufficient robustness for consumer digital TVs and receivers, while the NB7L573MNR2G serves specialized high-speed serial links lacking HDMI-specific control logic - making TMDS341APFC the optimal choice for HDMI/DVI source aggregation with full protocol transparency.
Availability
TMDS341APFC is available at Aetrix Electronics and suitable for digital television, audio/video receivers, and gaming console docking stations requiring stable component supply and long-term production continuity.
Supply support for TMDS341APFC 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The TMDS341APFC belongs to TI's high-speed interface product line, engineered specifically for HDMI/DVI signal routing in cost-sensitive, high-volume AV equipment with strict signal integrity and protocol compliance requirements.
FAQ
What is the maximum supported resolution and color depth for TMDS341APFC?
The TMDS341APFC supports resolutions up to 1080i/p at 2.25 Gbps signaling rate with 12-bit color depth, meeting HDMI 1.3a specifications. It handles 720p, 1080i, and 1080p formats across all three input ports, provided pixel clock frequencies remain within the 2.25 Gbps limit per TMDS channel. The TMDS341APFC does not support 4K/UHD due to bandwidth constraints.
Does TMDS341APFC require external termination resistors on TMDS inputs?
No, the TMDS341APFC integrates 50-Ω termination resistors pulled to VCC on all TMDS input pins (A/B groups), eliminating the need for external terminations. This simplifies PCB layout and reduces BOM count. External termination is only required at the sink side, per HDMI/DVI specification - the TMDS341APFC itself provides receiver-side matching.
How does the VSADJ pin configure TMDS output voltage swing in TMDS341APFC?
The VSADJ pin on the TMDS341APFC sets differential output voltage swing by connecting an external 4.64-kΩ ±1% resistor to ground. This adjusts the internal current source to deliver 560–840 mVpp differential output, compliant with TMDS standards. Deviation from 4.64 kΩ alters swing amplitude and may cause eye diagram closure or receiver lock failure in the TMDS341APFC.
Can TMDS341APFC be used in a 2-to-1 switch configuration?
Yes, the TMDS341APFC can be configured as a 2-to-1 switch by tying one source selector input (e.g., S3) low and leaving its corresponding TMDS inputs (A31–A34/B31–B34), HPD3, SCL3, and SDA3 unconnected. The remaining two ports operate normally, with DDC isolation and HPD control preserved - enabling flexible design reuse without hardware modification to the TMDS341APFC.
What is the role of the PRE pin in TMDS341APFC, and how should it be used?
The PRE pin on the TMDS341APFC enables 3-dB output de-emphasis when driven high, improving signal integrity over longer PCB traces or cables by pre-compensating for high-frequency loss. For typical 5-m HDMI cable applications or short-board routing, PRE should be held low (0-dB). Driving PRE high is recommended only when measured eye diagrams show excessive intersymbol interference at the sink input - verified via oscilloscope analysis of TMDS341APFC outputs.
TMDS341APFC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 80-TQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- 3:1 Switchable DVI/HDMI Receiver
- Interface:
- DVI, HDMI
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 80-TQFP (12x12)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
TMDS341APFC FAQ
1.How can I place an order for TMDS341APFC through Aetrix?
Please submit a Request for Quotation (RFQ) for TMDS341APFC 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 TMDS341APFC reliable?
The price and inventory of TMDS341APFC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMDS341APFC is usually 5 days.
3.What payment methods are accepted for TMDS341APFC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMDS341APFC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMDS341APFC?
TMDS341APFC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMDS341APFC 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 TMDS341APFC?
For technical support, including TMDS341APFC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMDS341APFC requirements.
6.How does Aetrix verify that TMDS341APFC is sourced from the original manufacturer or authorized distributors?
All TMDS341APFC 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 TMDS341APFC meets industry standards.
7.What is the process for return or replacement of TMDS341APFC?
All TMDS341APFC units undergo pre-shipment inspection (PSI). If there is an issue with TMDS341APFC, 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 TMDS341APFC part is unused and in its original packaging.
Return procedure for TMDS341APFC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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