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74VHC138T Datasheet(PDF) 2 Page - STMicroelectronics |
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74VHC138T Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 8 page INPUT EQUIVALENT CIRCUIT LOGIC DIAGRAM PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCT ION 1, 2, 3 A, B, C Address Inputs 4, 5 G2A, G2B Enable Inputs 6 G1 Enable Input 15, 14, 13, 12, 11, 10, 9, 7 Y0 to Y7 Outputs 8 GND Ground (0V) 16 VCC Positive Supply Voltage TRUTH TABLE INPUT S OUTPUTS ENABL E SELECT G2B G2A G 1 C B A Y0Y1Y2Y3 Y4 Y5Y6Y7 X X L X X X HHHHH H H H X H X X X X HHHHH H H H H X X X X X HHHHH H H H L L H L L L L HHHH H H H L L HL LH HLH H H H H H L L HLHL H H LH H H H H L L H L HH HHH L H H H H L L HH L L HHHH L H H H L L HH L H HHHHH L H H L L HHH L HHHHH H L H L L HHHH HHHHH H H L X:Don’t Care Thislogic diagram has notbe used to estimate propagation delays 74VHC138 2/8 |
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