MC74LCX139DTG ON Semiconductor

MC74LCX139 Dual Low-Voltage CMOS 2-to-4 Decoder/Demultiplexer With 5 VTolerant Inputs The MC74LCX139 is a high performance, 2 to 4 decoder/ MC74LCX139 Ea 1 16 V CC 2 15 A0a Eb X/Y DMUX 3 4 3 4 A1a Y0a A1a Y0a 1 0 0 0 0 2 2 5 G 5 A0a Y1a A0a Y1a 3 14 3 A1a A0b 2 1 1 1 1 1 6 6 Ea Y2a Ea Y2a EN 2 2 4 13 Y0a A1b 7 7 Y3a Y3a 3 3 12 12 Y0b Y0b Y1a 5 12 Y0b 13 13 11 11 A1b Y1b A1b Y1b Y2a 6 11 Y1b 14 14 10 10 A0b A0b Y2b Y2b 15 15 9 9 Eb Y3b Eb Y3b Y2b Y3a 7 10 GND 8 9 Y3b Figure 1. Pin Assignment Figure 2. IEC Logic Diagram PIN NAMES 2 4 A0a Y0a ADDRESS Pins Function INPUTS 3 5 Y1a A1a ACTIVELOW A0n A1n Address Inputs 6 OUTPUTS Y2a En Enable Inputs 7 Y3a Y0n Y3n Outputs 1 Ea TRUTH TABLE Inputs Outputs 14 12 ADDRESS A0b Y0b E A1 A0 Y0 Y1 Y2 Y3 13 11 INPUTS A1b Y1b ACTIVELOW H X X H H H H 10 OUTPUTS Y2b L L L L H H H 9 Y3b L L H H L H H L H L H H L H 15 Eb L H H H H H L H = High Voltage Level Figure 3. Logic Diagram L = Low Voltage Level Z = High Impedance State En Y0 Y1 A0 Y2 Y3 A1 Figure 4. Expanded Logic Diagram (1/2 of Device)