Texas Instruments TMDS261PAG

Overview

TMDS261PAG from Texas Instruments is a 2-to-1 HDMI/DVI switch IC designed for sink-side video routing in high-definition displays. It supports 1080p resolution at up to 3 Gbps, features adaptive equalization for up to 20-m cables, integrates DDC repeater and TMDS clock-detect circuitry, and operates from a single 3.3-V supply in 0°C to 70°C ambient.

For engineers reviewing the TMDS261PAG datasheet, TMDS261PAG pinout, TMDS261PAG application, or TMDS261PAG equivalent, this page delivers verified technical context on HDMI signal integrity, GPIO/I²C configuration modes, power-state transitions, TMDS output swing tuning via VSadj, and hot-plug detect behavior across dual source ports.

Technical Context

The TMDS261PAG implements a dual-input, single-output TMDS multiplexer with per-port adaptive equalization that compensates for up to 20 dB of intersymbol interference at 3 Gbps. Its receive stage tolerates non-compliant input common-mode voltage (V_IC = V_CC – 0.4 V to V_CC + 0.01 V), and its clock-detect logic enables automatic termination switching and high-impedance output gating when no valid TMDS clock is present.

Control is implemented via either local I²C (slave-only, 100 kHz) or GPIO mode (S1/S2 select, LP pin for low-power). The DDC repeater isolates source- and sink-side I²C capacitance using configurable OVS settings, while VSadj resistor (4.02 kΩ ±10%) adjusts TMDS output swing to meet HDMI compliance requirements.

Key Specifications

Pinout & Package

TMDS261PAG is housed in a 64-pin TQFP (PAG package), RoHS-compliant, with 0.5-mm pitch and exposed thermal pad. Pin count and layout are pin-compatible with TMDS251.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HDMI/DVI switch applications.

Compared with TMDS251PAG, TMDS261PAG adds adaptive equalization, 3-Gbps capability, and VSadj tuning - essential for 1080p/Deep Color. Versus PI3HDX1204ZLEX, TMDS261PAG offers simpler power architecture and GPIO control, but lacks multi-port scalability and HDMI 2.0 readiness.

Availability

TMDS261PAG is available at Aetrix Electronics and suitable for high-definition digital TV, professional signage displays, and HDMI test equipment requiring stable component supply, long-lifecycle assurance, and traceable sourcing.

Supply support for TMDS261PAG 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, performance, and broad application support.

The TMDS261PAG belongs to TI's HDMI/DVI interface product line, engineered specifically for sink-side video routing in consumer and professional displays where signal integrity, ESD robustness, and flexible configuration are critical.

FAQ

What is the maximum HDMI resolution supported by the TMDS261PAG?

The TMDS261PAG supports HDMI resolutions up to 1080p at 60 Hz with 16-bit color depth and Deep Color, enabled by its 3-Gbps signaling capability and adaptive equalization. It complies with HDMI 1.3a and DVI 1.0 specifications, and does not support 4K/UHD or HDMI 2.0+ data rates. The TMDS261PAG achieves this performance while maintaining robust signal integrity over extended cable lengths up to 20 meters.

How does the TMDS261PAG handle hot-plug detection across two HDMI sources?

The TMDS261PAG uses dedicated HPD[1:2] output pins to relay hot-plug status from the sink (HPD_SINK) to each source port. Only the selected port reflects HPD_SINK state; the deselected port's HPD output is driven low. This prevents false plug/unplug events and ensures proper EDID exchange. The TMDS261PAG also provides propagation delay specs (t_PD1 = 12–20 ns) to guarantee timing compliance with HDMI specification requirements.

Can the TMDS261PAG operate in both I²C and GPIO control modes simultaneously?

No - the TMDS261PAG operates exclusively in one control mode at a time, selected by the logic level on the I2C_SEL pin. When I2C_SEL is low, the device enters I²C slave mode for advanced configuration (edge rate, OVS, power states). When I2C_SEL is high (or floating, due to internal pullup), it defaults to GPIO mode using S1/S2 for port selection and LP for low-power entry. Mixing modes is not supported, and the TMDS261PAG does not arbitrate between concurrent I²C and GPIO commands.

What is the purpose of the VSadj pin on the TMDS261PAG, and how is it configured?

The VSadj pin on the TMDS261PAG accepts an external precision resistor (4.02 kΩ ±10%) to set the TMDS output voltage swing, ensuring compliance with HDMI specification limits of 800–1200 mV_pp. This resistor forms a voltage divider with internal circuitry to adjust AVCC-referenced output drive strength. Incorrect VSadj resistance causes out-of-spec V_OD(pp), risking interoperability failures. The TMDS261PAG datasheet specifies R_VSadj tolerance and thermal drift requirements to maintain stability across temperature.

Does the TMDS261PAG provide ESD protection on all interface pins, and what level is certified?

Yes - the TMDS261PAG provides HBM ESD protection rated at ±10 kV on all TMDS, DDC (SCL/SDA), and HPD pins, and ±9 kV on all other I/Os. This exceeds HDMI compliance requirements and addresses real-world handling stress in manufacturing and field deployment. The protection is built-in; no external TVS diodes are required on these lines unless system-level testing reveals additional margin needs. The TMDS261PAG's ESD rating is validated per JEDEC JESD22-A114-B and IEC 61000-4-2 standards.