Casio QT 6000 Service Manual - Page 93

10. IC DATA s MAIN PCB (E820-1 PCB) 1. ALVCH16244 (IC13, 17) 1OE 1 1Y1 2 1Y2 3 GND 4 1Y3 5 1Y4 6 VCC 7 2Y1 8 2Y2 9 GND 10 2Y3 11 2Y4 12 3Y1 13 3Y2 14 GND 15 3Y3 16 3Y4 17 VCC 18 4Y1 19 4Y2 20 GND 21 4Y3 22 4Y4 23 4OE 24 48 2OE 47 1A1 46 1A2 45 GND 44 1A3 43 1A4 42 VCC 41 2A1 40 2A2 39 GND 38 2A3 37 2A4 36 3A1 35 3A2 34 GND 33 3A3 32 3A4 31 VCC 30 4A1 29 4A2 28 GND 27 4A3 26 4A4 25 3OE terminal assignments 1 2 A 1OE NC B 1Y2 1Y1 C 1Y4 1Y3 D 2Y2 2Y1 E 2Y4 2Y3 F 3Y1 3Y2 G 3Y3 3Y4 H 4Y1 4Y2 J 4Y3 4Y4 K 4OE NC NC No internal connection 3 NC GND VCC GND GND VCC GND NC logic diagram (positive logic) 1 1OE 47 1A1 46 1A2 44 1A3 1A4 43 2 1Y1 3 1Y2 5 1Y3 6 1Y4 25 3OE 36 3A1 35 3A2 33 3A3 3A4 32 48 2OE 41 2A1 40 2A2 38 2A3 2A4 37 8 2Y1 9 2Y2 11 2Y3 12 2Y4 24 4OE 30 4A1 29 4A2 27 4A3 4A4 26 13 3Y1 14 3Y2 16 3Y3 17 3Y4 19 4Y1 20 4Y2 22 4Y3 23 4Y4 4 5 6 NC NC 2OE GND 1A1 1A2 VCC 1A3 1A4 GND 2A1 2A2 2A3 2A4 3A2 3A1 GND 3A4 3A3 VCC 4A2 4A1 GND 4A4 4A3 NC NC 3OE FUNCTION TABLE (each 4-bit buffer) INPUTS OE A OUTPUT Y L H H L L L H X Z - 91 -