CM2009 Datasheet | CMD

.. CM2009 VGA Port panion Circuit Features - - Includes ESD protection, level-shifting, buffering and sync impedance matching 7 channels of ESD protection for all VGA port connector pins meeting IEC-61000-4-2 Level 4 ESD requirements (±8k V contact discharge) Very low loading capacitance from ESD protection diodes on VIDEO lines, 4p F maximum 5V drivers for HSYNC and VSYNC lines Integrated impedance matching resistors on sync lines Bi-directional level shifting N-channel FETs provided for DDC_CLK & DDC_DATA channels Backdrive protection on DDC lines pact 16-lead QSOP package Product Description The CM2009 connects between a video graphics controller embedded in a PC, graphics adapter card or set top box and the VGA or DVI-I port connector. The CM2009 incorporates ESD protection for all signals, level shifting for the DDC signals and buffering for the SYNC signals. ESD protection for the video, DDC and SYNC lines is implemented with low-capacitance current steering diodes. All ESD diodes are designed to safely handle the high current spikes specified by IEC-61000-4-2 Level 4 (±8KV contact discharge if CBYP is present, ±4KV if not). The ESD protection for the DDC signal pins are designed to prevent "back current" when the device is powered down while connected to a monitor that is powered up. Separate positive supply rails are provided for the VIDEO, DDC and SYNC channels to facilitate interfacing with low voltage video controller ICs to provide design flexibility in multi-supply-voltage environments. (cont’d next page) - - - - - - Applications - VGA and DVI-I ports in: - Desktop and Notebook PCs - Graphics Cards - Set Top Boxes Simplified Electrical Schematic VCC_VIDEO DDC_OUT1 DDC_OUT2 VCC_DDC VCC_SYNC VIDEO_1 VIDEO_2 VIDEO_3 3 4 5 RT RT 16 14 DDC_IN1 DDC_IN2 SYNC_IN1 SYNC_IN2 10 11 13 15 SYNC_OUT2 SYNC_OUT1 © 2004 California Micro Devices Corp. All rights reserved. 08/12/04 430 N. Mc Carthy...