Texas Instruments TMDS171IRGZT

Overview

TMDS171IRGZT from Texas Instruments is a 3.4 Gbps HDMI/DVI retimer IC with integrated adaptive equalizer, four-channel TMDS re-timing, ARC/SPDIF audio support, and dual 1.2 V / 3.3 V power rails. It operates in automatic redriver-to-retimer mode crossover at 0.75–1.25 Gbps and supports 4k2k30p, WUXGA 12-bit color, and 1080p high-refresh applications in digital TVs and projectors.

For engineers reviewing the TMDS171IRGZT datasheet, TMDS171IRGZT pinout, TMDS171IRGZT application, or TMDS171IRGZT equivalent, this page delivers verified electrical specs, validated VQFN-48 pin functions, confirmed HDMI 1.4b compliance, real-world inter-pair skew compensation (≤1.8 ns), and precise power consumption data across retimer/redriver/standby modes.

Technical Context

The TMDS171IRGZT implements a CDR-based retimer architecture with programmable PLL bandwidth (0.4–1 MHz) and automatic mode switching: redriver below 1 Gbps, retimer above 1.2 Gbps. Its input stage features adaptive or fixed-gain (7.5 dB / 14 dB) equalization per TMDS lane, while output stage supports programmable de-emphasis and voltage-swing control via VSADJ (7.06 kΩ to GND).

It integrates dual DDC paths (source/sink), bidirectional HPD signaling, single-ended ARC_OUT (3.687–13.517 MHz) and SPDIF_IN interfaces, and failsafe termination (90–115 Ω differential). All TMDS I/Os comply with HDMI 1.4b electrical parameters including jitter tolerance (≤0.3 Tbit clock, ≤150 ps data), intra-pair skew (≤112 ps), and inter-pair skew (≤1.8 ns).

Key Specifications

Pinout & Package

TMDS171IRGZT uses a 48-pin VQFN package (7.0 mm × 7.0 mm, 0.5 mm pitch) with exposed thermal pad tied to GND. Pin functions are validated per TI SLLSEN7E datasheet Rev E (September 2017).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMDS171IRGZT, TMDS181IRGZT adds HDCP 2.2 and higher bandwidth but increases BOM cost and power; PS8409B-VL provides full HDCP stack but demands different layout, firmware integration, and licensing - TMDS171IRGZT remains optimal for cost-sensitive, non-HDCP HDMI 1.4b applications requiring proven reliability and minimal design overhead.

Availability

TMDS171IRGZT is available at Aetrix Electronics and suitable for digital television, projector, and active cable applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TMDS171IRGZT 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 technologies, with decades of HDMI interface IP development.

The TMDS171 product line targets HDMI signal integrity enhancement in cost-sensitive consumer electronics, delivering robust retiming without HDCP complexity or excessive power draw.

FAQ

What is the maximum supported data rate for TMDS171IRGZT?

The TMDS171IRGZT supports up to 3.4 Gbps per TMDS lane, enabling 4k2k30p at 24 bits per pixel and WUXGA resolution with 12-bit color depth. This maximum rate is validated under HDMI 1.4b electrical compliance conditions with proper termination and VSADJ biasing.

Does TMDS171IRGZT support HDCP?

No, TMDS171IRGZT does not include HDCP encryption or authentication logic. It is a physical-layer retimer only, designed for HDMI 1.4b signal integrity enhancement without content protection - HDCP must be handled upstream or downstream of the TMDS171IRGZT.

How does TMDS171IRGZT handle automatic mode switching between redriver and retimer?

TMDS171IRGZT automatically switches from redriver mode (<1 Gbps) to retimer mode (>1.2 Gbps) based on detected input data rate, with hysteresis (0.75–1.25 Gbps crossover range). No external control is needed - the decision is made internally by the signal detector circuit.

What is the function of the VSADJ pin on TMDS171IRGZT?

The VSADJ pin on TMDS171IRGZT sets TMDS output voltage swing via an external 7.06 kΩ resistor to GND, producing a nominal 500 mVpp single-ended output. Deviations adjust swing linearly: ±20 mV per 100 Ω change in VSADJ resistance.

Can TMDS171IRGZT operate with only a 3.3 V supply?

No - TMDS171IRGZT requires two independent supplies: 1.2 V on VDD pins (pins 14, 23, 24, 37, 48) and 3.3 V on VCC pins (pins 13, 43). Both rails must be present and within recommended operating ranges (1.1–1.27 V for VDD; 3.135–3.465 V for VCC) for functional operation.