PACVGA105QR ON Semiconductor

PACVGA105 VGA Port Companion Circuit Product Description The PACVGA105 incorporates 7 channels of ESD protection for signal lines commonly found in a VGA port for PCs. ESD protection is implemented with current steering diodes designed to safely handle PACVGA105 SIMPLIFIED ELECTRICAL SCHEMATIC V V CC AUX V RGB 1.8 k 1.8 k 50 k 50 k DDC CLK VSYNC OUT R G B GNDD DDC DATA HSYNC OUT HSYNC GNDA VSYNC PACKAGE / PINOUT DIAGRAMS Top View HSYNC OUT 1 16 V CC HSYNC 2 15 VSYNC OUT GNDD 3 14 VSYNC V 4 13 V RGB AUX B 5 12 DDC CLK G 6 11 GNDD R 7 10 DDC DATA GNDA 8 9 V CC 16 Pin QSOP Table 1. PIN DESCRIPTIONS Lead(s) Name Description 1 HSYNC OUT Horizontal sync signal buffer output. Connects to the video connector side of the horizontal sync line. 2 HSYNC Horizontal sync signal buffer input. Connects to the VGA Controller side of the horizontal sync line. 3, 11 GNDD Digital ground reference supply pin. 4 V V supply pin. This is an isolated supply pin for the R, G and B ESD protection circuits. RGB RGB 5 B Blue signal video protection channel. This pin is typically tied to the B video line between the VGA controller device and the video connector. 6 G Green signal video protection channel. This pin is typically tied to the G video line between the VGA controller device and the video connector. 7 R Red signal video protection channel. This pin is typically tied to the R video line between the VGA controller device and the video connector. 8 GNDA Analog ground reference supply pin. 9, 16 V V supply pin. This is the main supply input for the DDC CLK and DDC DATA pullup resistors and CC CC ESD protection circuits. It is also connected to the sync buffers and to the ESD protection diodes present on the HSYNC OUT and VSYNC OUT lines. 10 DDC DATA DDC data pin. 12 DDC CLK DDC clock pin. 13 V V supply pin. This is the supply input for the 50 k pullups connected to the HSYNC and VSYNC AUX AUX buffer inputs. 14 VSYNC Vertical sync signal buffer input. Connects to the VGA Controller side of the vertical sync line. 15 VSYNC OUT Vertical sync signal buffer output. Connects to the video connector side of the vertical sync line.