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CD74HCT138MG4 Datasheet(PDF) 2 Page - Texas Instruments |
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CD74HCT138MG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 18 page 2 Pinout CD54HC138, CD54HCT138, CD54HC238, CD54HCT238 (CERDIP) CD74HC138, CD74HCT138, CD74HCT238 (PDIP, SOIC) CD74HC238 (PDIP, SOIC, SOP, TSSOP) TOP VIEW Signal names in parentheses are for ’HC138 and ’HCT138. Functional Diagram 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 A0 A1 A2 E1 E2 E3 GND (Y7) Y7 VCC Y1 (Y1) Y2 (Y2) Y3 (Y3) Y4 (Y4) Y5 (Y5) Y6 (Y6) Y0 (Y0) 15 14 13 12 10 7 9 11 1 2 3 5 6 4 E3 E2 E1 A2 A1 A0 Y0 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 Y7 Y6 Y5 Y4 Y3 Y2 Y1 HC/HCT 238 HC/HCT 138 TRUTH TABLE ’HC138, ’HCT138 INPUTS OUTPUTS ENABLE ADDRESS E3 E2 E1 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X X X HHHHHHHH L X X X X X HHHHHHHH X H X X X X HHHHHHHH H L LLLLL H H H H H H H H L L L L H H L HHHHHH H L L L H L HH L H HHHH H L L L HHHHH L HHHH H L L H L L HHHH L HHH H L L H L HHHHHH L H H H L L H H L HHHHHH L H H L L H HHHHHHHHH L H = High Voltage Level, L = Low Voltage Level, X = Don’t Care TRUTH TABLE ’HC238, ’HCT238 INPUTS OUTPUTS ENABLE ADDRESS E3 E2 E1 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X X X LLLLLLLL L X X X X X LLLLLLLL X H X X X X LLLLLLLL H L LLLL H LLLLLLL H L LLL H L H LLLLLL H L LL H L LL H L LLLL H L LL H H LLL H LLLL H L L H LLLLLL H L LL HL LHLHL L L L LHL L H L L H H L LLLLLL H L H L L H H H LLLLLLL H H = High Voltage Level, L = Low Voltage Level, X = Don’t Care CD54/74HC138, CD54/74HCT138, CD54/74HC238, CD54/74HCT238 |
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