Casio QT 6000 Service Manual - Page 96
HD74LVC08 IC20, HD74LVC244 IC4,5, HD74LVC138 IC11, HD74LVC245 IC6,7
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Page 96 highlights
6. HD74LVC08 (IC20) 1A 1 1B 2 1Y 3 2A 4 2B 5 2Y 6 GND 7 14 VCC 13 4B 12 4A 11 4Y 10 3B 9 3A 8 3Y 7. HD74LVC138 (IC11) A1 B2 C3 G2A 4 G2B 5 G1 6 Y7 7 GND 8 B A Y0 C Y1 G2A Y2 G2B Y3 G1 Y4 Y7 Y6 Y5 8. HD74LVC244 (IC4,5) 1G 1 1A1 2 2Y4 3 1A2 4 2Y3 5 1A3 6 2Y2 7 1A4 8 2Y1 9 GND 10 20 Vcc 19 2G 18 1Y1 17 2A4 16 1Y2 15 2A3 14 1Y3 13 2A2 12 1Y4 11 2A1 Inputs G A H X L H L L H : High L : Low X : Don't care Z : High impedance Output Y Z H L 9. HD74LVC245 (IC6,7) T/R 1 A0 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 GND 10 20 Vcc 19 OE 18 B0 17 B1 16 B2 15 B3 14 B4 13 B5 12 B6 11 B7 Inputs OE T / R L L L H H X Output Y Bus B Data to Bus A Bus A Data to Bus B Z H : High L : Low X : Don t care Z : High impedance 16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6 - 94 -