CCVGA7C5 Datasheet | Unisonic Technologies

UNISONIC TECHNOLOGIES CO., LTD CCVGA7C5 Preliminary TVS VGA PORT PANION CIRCUIT - DESCRIPTION The UTC CCVGA7C5 is an ESD solution for the VGA port connector. This device integrates ESD protection for all signals, Two non-inverting drivers provide buffering for the HSYNC and VSYNC signals from the video controller IC. These buffers accept TTL input levels and convert them to CMOS output levels that swing between Ground and VCC 。 These drivers have a nominal 60Ω output impedance to match the characteristic impedance of the HSYNC and VSYNC lines of the video cables typically used. The inputs of these drivers also have high impedance pull- ups (50kΩ nom.) pulling up to the VAUX rail. In addition, the DDC_CLOCK and DDC_DATA channels have 1.8kΩ resistors pulling these inputs up to the main 5V (VCC) rail. The upper ESD diodes for the R, G and B channels are connected to a separate supply rail (VRGB) to facilitate interfacing to graphics controller ICs with low voltage supplies. The remaining channels are connected to the main 5 V rail (VCC). The lower diodes for the R, G and B channels are also connected to a dedicated ground pin (GNDA) to minimize crosstalk due to mon ground impedance. ESD protection is implemented with current steering diodes designed to safely handle the high peak surge currents associated with the IEC- 1000- 4- 2 Level- 4 ESD Protection Standard (±8k V contact discharge). When the channels are subjected to an electrostatic discharge, the ESD current pulse is diverted via the protection diodes into the positive supply rails or ground where they may be safely dissipated. - Features - TTL to CMOS Level- Translating Buffers for the HSYNC and VSYNC Lines - High impedance Pull- Ups (50kΩ Nominal to VAUX) for HSYNC and VSYNC Inputs - Pull- Up Resistors (1.8kΩ Nominal to VCC) for DDC_CLK and DDC_DATA Lines - 7 Channels of ESD Protection Designed to Meet IEC- 1000- 4- 2 Level- 4 ESD Requirements (±8k V Contact Discharge) - Three Independent Supply Pins (VCC,...