Texas Instruments TMDS351PAGR

Overview

TMDS351PAGR from Texas Instruments is a 3-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, integrated 50-Ω receiver termination, and selectable EQ for short/long HDMI cables. It operates with dual supplies (3.3 V for TMDS, 5 V for HPD/DDC) and is used in digital TV, projector, and game console inputs.

For engineers reviewing the TMDS351PAGR datasheet, TMDS351PAGR pinout, TMDS351PAGR application, or TMDS351PAGR equivalent, key selection criteria include HDMI 1.3a compliance, intra-pair skew < 40 ps, inter-pair skew < 65 ps, integrated termination, and EQ-controlled cable-length adaptation - all critical for robust high-speed video switching in production AV equipment.

Technical Context

The TMDS351PAGR implements a 3-port × 4-channel TMDS switch with independent hot-plug detect (HPD) outputs per source and shared sink-side DDC (I²C) pass-through. Its control logic uses S1/S2 to select one of three input ports while disconnecting terminations on unselected ports to reduce leakage and power.

Each TMDS receiver includes frequency-responsive equalization (EQ pin-selectable), supporting HDMI 1.3a-compliant cables at low EQ and up to 10 m / 28 AWG at high EQ. The device maintains DDC link integrity during standby by powering HPD/DDC circuits from VDD (5 V) while disabling TMDS I/O via VCC (3.3 V) shutdown.

Key Specifications

Pinout & Package

TMDS351PAGR is housed in a 64-pin TQFP (PAG) package with exposed thermal pad, RoHS-compliant and 260 °C reflow-rated.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HDMI switching applications.

Compared with TMDS351PAGR, TMDS341APAGR offers identical performance per channel but lacks the third input port and associated control logic, while NB7L573MNR2G provides higher bandwidth at the cost of increased design complexity and no native HDMI system-level features.

Availability

TMDS351PAGR is available at Aetrix Electronics and suitable for digital TV, projector, and game console designs requiring stable component supply, HDMI 1.3a compliance, and production-ready signal integrity.

Supply support for TMDS351PAGR 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 focused on analog, embedded processing, and connectivity technologies with broad industrial and consumer applications.

The TMDS351 product line was designed specifically for HDMI/DVI video routing in cost-sensitive, high-volume consumer electronics - delivering integrated termination, EQ, and system-level HPD/DDC management in a single IC.

FAQ

What is the maximum supported resolution and color depth for TMDS351PAGR?

The TMDS351PAGR supports up to 1080p resolution with 12-bit color depth at 2.5 Gbps signaling rate. This is confirmed in the datasheet's DESCRIPTION section and validated by its compliance with HDMI 1.3a specifications for deep color. The TMDS351PAGR achieves this using four fully differential TMDS channels - one clock and three data lanes - with precise skew control (<40 ps intra-pair, <65 ps inter-pair) to maintain signal integrity at full bandwidth.

How does the EQ pin affect TMDS351PAGR performance with different HDMI cables?

The EQ pin on TMDS351PAGR configures receiver equalization strength: EQ = Low supports HDMI 1.3-compliant cables (e.g., 3 m/30 AWG), while EQ = High enables reliable operation with longer 10 m/28 AWG cables. This is implemented via frequency-responsive analog equalization circuits per TMDS receiver, as detailed in the APPLICATION INFORMATION section. The TMDS351PAGR datasheet provides measured jitter curves showing <20 ps residual peak-to-peak jitter under both EQ settings at 2.5 Gbps.

Can TMDS351PAGR operate in low-power standby mode while maintaining HPD/DDC functionality?

Yes - TMDS351PAGR supports true standby operation: VCC (3.3 V) can be powered off to disable TMDS I/O and internal switching, while VDD (5 V) remains active to sustain HPD status reporting and DDC (I²C) pass-through. This allows the connected display to detect source presence and read EDID even when the main video path is inactive. The TMDS351PAGR datasheet explicitly describes this dual-supply architecture in the DESCRIPTION and APPLICATION INFORMATION sections.

What is the purpose of the VSADJ pin on TMDS351PAGR, and what resistor value is required?

The VSADJ pin on TMDS351PAGR sets the TMDS output voltage swing via an external precision resistor to ground. A 4.02 kΩ ±10 % resistor is specified to achieve HDMI-compliant 500 mV typical (400–600 mV) single-ended swing, as verified in the RECOMMENDED OPERATING CONDITIONS and ELECTRICAL CHARACTERISTICS tables. This resistor directly controls the current source in the output driver stage, ensuring consistent differential amplitude across process/voltage/temperature variations.

Does TMDS351PAGR require external termination resistors on its TMDS inputs?

No - TMDS351PAGR integrates 50-Ω termination resistors at each TMDS receiver input (Axx/Bxx pins), pulled to VCC. External terminations are not required, as stated in the DESCRIPTION section: "Termination resistors (50-Ω), pulled up to VCC, are integrated at each TMDS receiver input. External terminations are not required." These terminations are enabled only when the corresponding port is selected, minimizing power draw and leakage from unconnected sources.