DVI Connector Pinout: TMDS Clock+ Pin Number

This article provides a direct guide to identifying the TMDS Clock+ pin on a standard Digital Visual Interface (DVI) connector. It covers the exact pin assignment, the role of Transition-Minimized Differential Signaling (TMDS) clock channels in digital video transmission, and the configuration of adjacent related pins across DVI-D and DVI-I specifications.

The TMDS Clock+ Pin Assignment

The exact pin number for TMDS Clock+ in a DVI connector is Pin 23.

In the standard DVI pinout layout (applicable to DVI-D and DVI-I connectors in both single-link and dual-link configurations), the pins are arranged in a 3-row by 8-column digital grid. Pin 23 is situated in the bottom row:

• Pin 22: TMDS Clock Shield
• Pin 23: TMDS Clock+
• Pin 24: TMDS Clock-

Function of TMDS Clock+

Digital Visual Interface uses TMDS to transmit high-speed serial data. TMDS utilizes differential signaling, requiring paired conductors carrying complementary signals (+ and -) to reduce electromagnetic interference and signal degradation over cable runs.

Pin 23 carries the positive half of the differential reference clock signal. Together with Pin 24 (TMDS Clock-), it provides the timing frequency required by the receiving display device (such as a monitor) to synchronize and decode the incoming digital color data channels (TMDS Data 0, 1, and 2, as well as secondary links 3, 4, and 5 in dual-link cables). Pin 22 serves as the dedicated ground shield specifically shielding this clock pair from adjacent data crosstalk.