CM2009-02QR

CM2009-02QR Features

• Includes ESD Protection, Level−Shifting, Buffering and

CM2009-02QR Product Description

The CM2009 connects between a video graphics controllerembedded in a PC, graphics adapter card or set top box and the VGAor DVI−I port connector. The CM2009 incorporates ESD protectionfor all signals, level shifting for the DDC signals and buffering for theSYNC signals. ESD protection for the video, DDC and SYNC lines isimplemented with low−capacitance current steering diodes.All ESD diodes are designed to safely handle the high current spikesspecified by IEC−61000−4−2 Level 4 (±8 kV contact discharge ifCBYP is present, ±4 kV if not). The ESD protection for the DDC signalpins are designed to prevent “back current” when the device ispowered down while connected to a monitor that is powered up.Separate positive supply rails are provided for the VIDEO, DDCand SYNC channels to facilitate interfacing with low voltage videocontroller ICs to provide design flexibility in multi−supply−voltageenvironments.Two non−inverting drivers provide buffering for the HSYNC andVSYNC signals from the video controller IC (SYNC1, SYNC2).These buffers accept TTL input levels and convert them to CMOSoutput levels that swing between Ground and VCC_SYNC, which istypically 5 V. Additionally, each driver has a series termination resistor(RT) connected to the SYNC_OUT pin, eliminating the externaltermination resistors typically required for the HSYNC and VSYNClines of the video cable. There are three versions with different valuesof RT to allow termination at typically 65 � (CM2009−00) or 15 �

CM2009-02QR Applications

• VGA and DVI−I Ports in:♦ Desktop and Notebook PCs

CM2009-02QR Description

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CM2009-02QR Description