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Texas Instruments TMDS251PAGR
- Part No.:
- TMDS251PAGR
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 64-TQFP
- Datasheet:
-
TMDS251PAGR.pdf
- Description:
- IC VIDEO SWITCH 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,655
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Product details
Overview
TMDS251PAGR from Texas Instruments is a 2-to-1 HDMI/DVI switch IC for digital video routing in consumer AV systems. It supports 2.5 Gbps signaling, 1080p/12-bit color depth, and dual-port source selection with integrated TMDS receiver termination and selectable equalization. It operates with separate 3.3-V (TMDS) and 5-V (HPD/DDC/control) supplies and is used in digital TV, DVD player, and projector inputs.
For engineers reviewing the TMDS251PAGR datasheet, TMDS251PAGR pinout, TMDS251PAGR application, or TMDS251PAGR equivalent, key selection criteria include HDMI 1.3a compliance, intra-pair skew < 40 ps, inter-pair skew < 65 ps, 64-pin TQFP package compatibility with TMDS351 (port 3 disabled), and support for standby-mode DDC/HPD retention while powering off VCC.
Technical Context
The TMDS251PAGR implements a 2:1 multiplexer architecture across four differential TMDS channels per port, with independent hot-plug detect (HPD) outputs per source and a shared sink HPD input. Its control logic decodes S1/S2 states to enable one input port while disconnecting terminations and disabling DDC paths on the inactive port.
It features dual-voltage domain operation: 3.3-V VCC powers TMDS I/Os and switching circuitry, while 5-V VDD sustains HPD, DDC, and source-select logic during system standby. Receiver equalization (EQ pin) configures frequency response for short (EQ = Low) or long (EQ = High) HDMI cables up to 15 m.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Signaling Rate | 2.5 Gbps - supports 1080p at 12-bit color depth without compression |
| Input Equalization | Selectable via EQ pin - Low for HDMI 1.3-compliant cables; High for 10 m / 28 AWG cables |
| Intra-Pair Skew | < 40 ps - ensures timing alignment within each TMDS data pair (A/B) |
| Inter-Pair Skew | < 65 ps - maintains channel-to-channel synchronization across Y1–Y4/Z1–Z4 outputs |
| Supply Voltages | VCC = 3.3 V ±10 % (TMDS I/O); VDD = 5 V ±10 % (HPD/DDC/control logic) |
| ESD Protection | HBM > 8 kV on TMDS inputs - meets IEC 61000-4-2 Level 4 for robust board-level immunity |
| Package | 64-pin TQFP (PAG) - footprint-compatible with TMDS351 when port 3 is disabled |
Pinout & Package
TMDS251PAGR is housed in a 64-pin TQFP (PAG) package with exposed thermal pad, RoHS-compliant and rated for 260°C reflow. Pin layout follows JEDEC MO-179 standard; NC pins must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A11–A14, B11–B14 | Port 1 TMDS+ / TMDS− inputs | Differential video/data inputs from HDMI source 1; internally terminated when selected |
| A21–A24, B21–B24 | Port 2 TMDS+ / TMDS− inputs | Differential video/data inputs from HDMI source 2; terminated only when active |
| Y1–Y4, Z1–Z4 | Sink TMDS+ / TMDS− outputs | Single-ended outputs drive HDMI receiver; swing controlled by VSADJ resistor |
| SCL1/SDA1, SCL2/SDA2 | Port 1/2 DDC I²C bidirectional lines | Pass-through I²C links to source-side EDID EEPROMs; 5-V tolerant with internal pass-gates |
| SCL_SINK/SDA_SINK | Sink DDC I²C bidirectional lines | Connect to display-side EDID; level-shifted to 3.3 V via VPASS clamping |
| HPD1/HPD2 | Source port HPD status outputs | 5-V TTL outputs mirroring HPD_SINK state when selected; low when inactive |
| HPD_SINK | Sink HPD status input | Drives all HPD outputs; enables E-EDID read initiation upon assertion |
| S1/S2 | Source select control inputs | LVTTL logic selects port 1 (S1=H,S2=L), port 2 (S1=L,S2=H), or disables both (S1=S2=L) |
| EQ | Equalization mode control | Configures receiver gain profile: Low = short cable; High = long cable compensation |
| VSADJ | Output voltage swing control | External 4.02-kΩ resistor sets compliant 400–600 mV single-ended swing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated switchable 50-Ω receiver termination | Eliminates need for external resistors; reduces BOM count and PCB area per port |
| Selectively enabled DDC pass-gates | Isolates inactive source DDC buses to prevent bus contention and false EDID reads |
| Standby power partitioning | VCC can be powered off while VDD remains active - preserves HPD/DDC functionality during system sleep |
| TMDS output voltage swing control | VSADJ pin + precision resistor ensures HDMI-compliant 500-mV typical differential output |
| HDMI 1.3a protocol compliance | Validated for 2.5 Gbps operation, 1080p/12-bit, and HDCP-ready signal integrity |
Applications
| Digital Television Input Switching | DVD/Blu-ray Player Hub |
|---|---|
Use Scenario: A digital TV with two HDMI inputs (e.g., set-top box and game console) routes video to a single HDMI receiver ASIC. IC Role / Device Role / Timing Role: 2-to-1 TMDS switch managing physical layer routing, HPD coordination, and DDC passthrough for EDID negotiation. Use Value: Enables seamless source switching without display re-detection; supports 1080p/12-bit color and low-skew timing required for broadcast-grade video. |
Use Scenario: A DVD/Blu-ray player acts as an HDMI repeater hub, accepting input from multiple sources and outputting to a single display. IC Role / Device Role / Timing Role: Dual-source selector providing TMDS path isolation, HPD status forwarding, and DDC transparency for upstream EDID reads. Use Value: Maintains HDCP session continuity across sources; eliminates manual cable swapping while preserving HDMI 1.3a signal integrity up to 2.5 Gbps. |
| Digital Projector Multi-Source Interface | AV Receiver HDMI Input Aggregation |
Use Scenario: A high-end projector accepts HDMI feeds from PC and media server, requiring glitch-free switching and stable EDID handshaking. IC Role / Device Role / Timing Role: Signal router with programmable equalization (EQ) to compensate for varying cable lengths from different sources. Use Value: EQ pin allows optimization for 3 m (EQ=Low) or 10 m (EQ=High) cables - ensuring jitter < 20 ps peak-to-peak at 2.228 Gbps (1080p 12-bit). |
Use Scenario: An AV receiver aggregates HDMI inputs before sending to downstream processing, requiring reliable hot-plug detection and DDC arbitration. IC Role / Device Role / Timing Role: Source selector with independent HPD1/HPD2 outputs and sink HPD_SINK input enabling coordinated plug/unplug detection. Use Value: Prevents phantom EDID reads from inactive ports; supports CEC passthrough in passive-link DTV architectures per Figure 18. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HDMI switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMDS351PAGR | 3-to-1 switch; identical pinout and electrical specs; port 3 disabled in 2-port configuration | Supports future expansion to third HDMI input without PCB redesign | Choose when system roadmap includes adding a third source; requires S3 control line not present on TMDS251PAGR |
| PI3HDX1204ZLEX | 12-Gbps-capable 2:1 HDMI 2.0 switch; 3.3-V only supply; no VDD/VCC separation | Targets 4K@60Hz UHD; lacks native 5-V HPD/DDC support and standby VCC-off capability | Choose for next-gen UHD designs; requires redesign of power and HPD interface circuits |
Compared with TMDS351PAGR, TMDS251PAGR offers lower cost and simpler control (no S3 line), but no upgrade path to three inputs. Compared with PI3HDX1204ZLEX, it delivers proven HDMI 1.3a performance with dual-supply flexibility for legacy DTV standby modes - critical where 5-V HPD signaling and low-power sleep are mandatory.
Availability
TMDS251PAGR is available at Aetrix Electronics and suitable for digital TV, DVD player, and digital projector applications requiring stable component supply, HDMI 1.3a compliance, and long-lifecycle industrial availability.
Supply support for TMDS251PAGR 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 TMDS251PAGR belongs to TI's HDMI/DVI interface product line, designed specifically for cost-sensitive, high-reliability consumer AV equipment requiring robust hot-plug management and multi-source video routing.
FAQ
What is the maximum supported resolution and color depth for TMDS251PAGR?
TMDS251PAGR supports up to 1080p resolution at 12-bit color depth, enabled by its 2.5 Gbps per-channel signaling rate. This meets HDMI 1.3a specifications and accommodates deep color formats including xvYCC and sYCC. The device does not support 4K/UHD resolutions, which require ≥6 Gbps rates per lane as defined in HDMI 2.0.
How does TMDS251PAGR handle power management during system standby?
TMDS251PAGR supports split-rail power management: the 3.3-V VCC supply to TMDS I/Os and switching circuits can be powered off during standby, while the 5-V VDD supply remains active to sustain HPD signaling, DDC link integrity, and source selection logic. This reduces total system standby current to ~2 mA (IDD), preserving remote wake-up capability without compromising EDID accessibility.
Can TMDS251PAGR be used with HDMI 2.0 sources or displays?
No. TMDS251PAGR is specified for HDMI 1.3a compliance with a maximum 2.5 Gbps signaling rate per TMDS channel. HDMI 2.0 requires ≥6 Gbps per lane for 4K@60Hz, exceeding this device's bandwidth. Attempting to use it with HDMI 2.0 sources may result in pixelation, sync loss, or failure to establish link training - TMDS251PAGR must be paired with HDMI 1.3a–compliant endpoints only.
What is the function of the VSADJ pin on TMDS251PAGR?
The VSADJ pin on TMDS251PAGR sets the TMDS output voltage swing by connecting an external precision resistor (recommended 4.02 kΩ ±10 %) to ground. This adjusts the differential output to the HDMI-specified range of 400–600 mVpp (500 mVpp typical), ensuring signal integrity and compatibility with downstream receivers' input thresholds. Incorrect resistor value causes undershoot/overshoot and potential link failure.
Does TMDS251PAGR provide ESD protection on TMDS inputs?
Yes. TMDS251PAGR provides HBM ESD protection exceeding 8 kV on all TMDS input pins (A11–A14, B11–B14, A21–A24, B21–B24), meeting IEC 61000-4-2 Level 4 requirements. This protects against electrostatic discharge during handling and board assembly. However, external ESD diodes are still recommended for end-equipment-level surge immunity in harsh environments.
TMDS251PAGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Switch
- Applications:
- Video Display
- Standards:
- HDMI 1.3a
- Control Interface:
- Logic
- Voltage - Supply:
- 3.0V ~ 3.6V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 64-TQFP (10x10)
TMDS251PAGR FAQ
1.How can I place an order for TMDS251PAGR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMDS251PAGR 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 TMDS251PAGR reliable?
The price and inventory of TMDS251PAGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMDS251PAGR is usually 5 days.
3.What payment methods are accepted for TMDS251PAGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMDS251PAGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMDS251PAGR?
TMDS251PAGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMDS251PAGR 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 TMDS251PAGR?
For technical support, including TMDS251PAGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMDS251PAGR requirements.
6.How does Aetrix verify that TMDS251PAGR is sourced from the original manufacturer or authorized distributors?
All TMDS251PAGR 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 TMDS251PAGR meets industry standards.
7.What is the process for return or replacement of TMDS251PAGR?
All TMDS251PAGR units undergo pre-shipment inspection (PSI). If there is an issue with TMDS251PAGR, 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 TMDS251PAGR part is unused and in its original packaging.
Return procedure for TMDS251PAGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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