MC74VHC138DTR2G

MC74VHC138 3-to-8 Line Decoder The MC74VHC138 is an advanced high speed CMOS 3to8 decoder fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation. MC74VHC138 PIN ASSIGNMENT A0 1 16 V CC 2 15 A1 Y0 3 14 Y1 A2 E1 4 13 Y2 5 E2 12 Y3 6 11 E3 Y4 7 10 Y7 Y5 GND 8 9 Y6 FUNCTION TABLE LOGIC DIAGRAM Inputs Outputs 15 Y0 1 E3 E2 E1 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 14 A0 Y1 SELECT X X H X X X HHH HHHH H 13 2 Y2 A1 INPUTS X H X X X X HHH HHHH H 12 ACTIVE-LOW Y3 3 L X X X X X HHH HHHH H A2 11 OUTPUTS Y4 H L L L L L L H H HHHH H 10 H L L L L H H L H HHHH H Y5 9 H L L L H L HH L HHHH H Y6 7 H L L L H H HHH L HHH H Y7 H L L H L L HHH H L HH H 6 E3 H L L H L H HHH HH L H H ENABLE 5 H L L H H L HHH HHH L H INPUTS E2 H L L H H H HHH HHHH L 4 E1 H = high level (steady state) L = low level (steady state) X = dont care