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M74HC138B1R Scheda tecnica(PDF) 2 Page - STMicroelectronics |
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2 / 10 page M74HC138 2/10 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE X : Don’t Care LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays PIN No SYMBOL NAME AND FUNCTION 1, 2, 3 A, B, C Address Inputs 4, 5 G2A, G2B Enable Inputs 6 G1 Enable Input 9, 10, 11, 12, 13, 14, 15, 7 Y0 to Y7 Data Outputs 8 GND Ground (0V) 16 VCC Positive Supply Voltage INPUTS OUTPUTS ENABLE SELECT G2B G2A G1 CBA Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X L X X X HHHHH HHH XH XXXX HHHHH HHH HXXXXX HHHHH HHH LL H LLLL HHHH HHH L LHL LH HLH H H H H H L LHLHLH HLH H H H H L L H L HHHHH L H HHH L L HH L L HHHH L HHH L L HH L HHHHHH L H H L L HHH L HHHHH H L H L L HHHHHHHHH HH L |
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