IT66313 is a single-in, single-out HDMI retiming buffer that supports a signaling rate of up to 12Gbps per channel. It is compliant with the latest HDMI 2.1b specification and backward compatible with HDMI1.4b/2.0b specification. With 48-Gbps/4-channel capability, IT66313 can support extra-high resolution content stream, such as the ultra-HD 8Kx4K format. At extremely high data rates, signal quality drops significantly with extended board trace or cable length, making an additional retiming buffer necessary in many systems.

The IT66313 supports both the traditional TMDS signal as defined in the HDMI1.4b/2.0b specification and the FRL signal developed in the HDMI 2.1b specification. It detects which type of signal is being transmitted from the source, and switches to the appropriate communication mode automatically. Moreover, video contents with features such as VRR, FVA, or DSC compression enabled as defined in the HDMI 2.1b are fully supported. The insertion of the re-timer into the system is essentially transparent to both the source and the sink devices.

The IT66313 equalizes incoming TMDS/FRL signals to optimal and outputs retimed data to downstream sinks. The highly acclaimed equalization technology of ITE TECH. INC. provides for support of long or low-quality on-board PCB trace at even the highest speeds. Moreover, digital technique is utilized in IT66313 for achieving better capability of signal regeneration. The TMDS/FRL input termination is detachable and programmable, and the output termination and current level are also configurable. A digital DDC buffer is equipped in IT66313 to isolate downstream DDC loading from upstream source, while communication on the DDC bus, such as EDID, SCDC, or HDCP Read/Write, is not affected.

With embedded MCU and Flash, IT66313 can be easily programmed via ISP or DDC interface for firmware update and configuration. The integrated MCU independently manages IT66313 operation, thus reducing customer development and programming efforts.

Furthermore, the IT66313 employs crystal-free FRL signal regeneration. The overall BOM cost and board size could be minimized with the fewest external components required.

IT66313 is suitable in applications such as trace or cable extender with variable receiver side path length. It could be utilized as the output buffer or input enhancer on the HDMI signals of AV products as well.

• Supports both TMDS and FRL signal re-timing.
• Total serial data bandwidth up to 48 Gbps/4-channel in FRL mode, capable of supporting ultra-HD resolution 8K4K format.
• Bandwidth up to 18 Gbps/3-channel in TMDS mode, supporting 4K2K@60 format.
• Supports DSC compression video stream.
• Supports HDMI 2.1b VRR and FVA features.
• Error recovery ability included by built-in RS decoder and encoder, enhancing link data integrity under harsh environment.
• Support AC-coupling at TMDS inputs for level-shifting.
• Adaptive and programmable input equalization supporting long and short cables.
• Auto-calibrated and programmable TMDS/FRL output current level, with optional output pre-emphasis and source termination.
• Embedded MCU with Flash enables software automatically control to reduce customer’s programming effort.
• Crystal-free design for reduced BOM cost.
• Auto power-saving feature to save power when down-stream device is not present or source device is not transmitting high speed data.

• PC/Laptop/AV center mother board output re-timer.
• TV/Monitor input enhancement.
• External AV or cable extender.
• Intern

As 8K ultra-high-resolution displays, 120Hz+ gaming content, and HDR video become mainstream, maintaining HDMI signal integrity over high-speed and long-distance transmission has become a critical challenge in system design.
ITE Tech. Inc. presents the IT66313, a high-performance HDMI 2.1 retimer IC that restores signal quality through a fully digital architecture—enhancing image clarity, transmission stability, and system compatibility.

The IT66313 features a single-input, single-output structure and supports both FRL (Fixed Rate Link) and TMDStransmission modes. With up to 48Gbps bandwidth, it supports advanced display formats such as 8K@60Hz、4K@144Hz, and beyond.
Key HDMI 2.1 features such as DSC compression, VRR (Variable Refresh Rate), and FVA (Frame Rate Adaptation)are fully supported, enabling use in gaming monitors, 8K players, and immersive video systems.

With built-in adaptive equalization and compensation circuitry, the IT66313 effectively restores degraded or jittered HDMI signals caused by long cables or poor signal paths. It significantly enhances image clarity and ensures reliable transmission, making it ideal for notebooks, desktops, monitors, TVs, and embedded AV platforms.

The IT66313 has been widely adopted in HDMI signal extenders, dongles, laptops, desktops, and ProAV solutions. Its stable performance is validated by successful deployments across various high-speed HDMI applications. The device meets HDMI Compliance Test Specification (CTS) requirements, enabling efficient certification and streamlined mass production.

The chip integrates an MCU and on-chip Flash for independent initialization, in-system programming (ISP) via DDC or I²C. Adjustable settings include output drive strength, termination resistance, and pre-emphasis, reducing BOM cost and accelerating product development.

With a high-accuracy internal clock generator, the IT66313 operates without the need for an external crystal oscillator—minimizing system cost and simplifying board layout.

• HDMI output enhancement for laptops and desktops
• HDMI input signal restoration for TVs and monitors
• HDMI signal extenders, switchers, adapters, and multimedia hubs
• High-speed board-to-board HDMI transmission in embedded/industrial systems

As the flagship HDMI retimer solution from ITE, the IT66313 combines robust signal recovery, high-speed support, and flexible system integration. It seamlessly integrates into existing HDMI designs without protocol changes, empowering your products with next-level AV performance.

ITE Tech. Inc. — Your Trusted Partner in High-Speed HDMI Signal Integrity. Start with IT66313.

ITE Official Site: https://www.ite.com.tw/tw
Macnica Anstek Inc. (Taiwan Distributer): marketing.anstek@macnica.com