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MC74LCX138D Datasheet(PDF) 2 Page - ON Semiconductor |
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2 / 8 page MC74LCX139 http://onsemi.com 2 13 14 15 16 9 10 11 12 5 4 3 2 1 8 7 6 Ea A1a A0a GND A1b A0b Eb VCC Y0a Y1a Y2a Y3a Y0b Y1b Y2b Y3b Figure 1. Pin Assignment TRUTH TABLE Inputs Outputs E A1 A0 Y0 Y1 Y2 Y3 HX X H H H H LL L L H H H LL H H L H H LH L H H L H LH H H H H L PIN NAMES Function Address Inputs Enable Inputs Outputs Pins A0n−A1n En Y0n−Y3n Figure 2. IEC Logic Diagram A0a A1a Ea A0b A1b 1 Eb Y0a Y1a Y2a Y3a Y0b Y1b Y2b Y3b ACTIVE−LOW OUTPUTS ADDRESS INPUTS ACTIVE−LOW OUTPUTS 3 2 ADDRESS INPUTS 13 14 15 4 5 6 7 12 11 10 9 4 Figure 3. Logic Diagram Y0a Y1a Y2a Y3a Y0b Y1b Y2b Y3b 5 6 7 12 11 10 9 15 14 13 1 2 3 A1a A0a Ea A1b A0b Eb 2 1 EN X/Y 1 0 2 3 0 1 DMUX 1 0 2 3 G 0 3 15 14 13 1 2 3 A1a A0a Ea A1b A0b Eb Y0a Y1a Y2a Y3a Y0b Y1b Y2b Y3b 4 5 6 7 12 11 10 9 En A0 A1 Y0 Y1 Y2 Y3 Figure 4. Expanded Logic Diagram (1/2 of Device) H = High Voltage Level; L = Low Voltage Level; Z = High Impedance State |
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