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CD74HC237PWG4 Datasheet(PDF) 2 Page - Texas Instruments |
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CD74HC237PWG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 19 page 2 Pinout CD54HC237 (CERDIP) CD74HC137 (PDIP, TSSOP) CD74HCT137 (PDIP, SOIC) CD74HC237 (PDIP, SOIC, SOP, TSSOP) CD74HCT237 (PDIP) TOP VIEW Functional Diagram 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 A0 A1 A3 LE OE1 OE0 GND Y7 VCC Y1 Y2 Y3 Y4 Y5 Y6 Y0 15 14 13 12 10 7 9 11 1 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 3 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 237 137 6 2 4 5 A0 A1 A2 LE OE1 OE0 3-BIT LATCH 1 OF 8 DECODER GND = 8 VCC = 16 HC/HCT HC/HCT ’HC137, ’HCT137 TRUTH TABLE INPUTS OUTPUTS LE OE0 OE1 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X X X HHHHHHHH X L X X X X HHHHHHHH L H LLLLL H H H H H H H L H L L L H H L HHHHHH L H L L H L HH L H HHHH L H L L HHHHH L HHHH L H L H L L HHHH L HHH LHLHLH H H H H H LH H L H L H H L HHHHHH L H L H L H HHHHHHHHH L H H L X X X Depends upon the address previously applied while LE was at a logic low. H = High Voltage Level, L = Low Voltage Level, X = Don’t Care ’HC237, ’HCT237 TRUTH TABLE INPUTS OUTPUTS LE OE0 OE1 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X X X LLLLLLLL X L X X X X LLLLLLLL L H LLLL H LLLLLLL LHL L LHLHL L L L L L L H LL H L LL H L LLLL L H LL H H LLL H LLLL L H L H LLLLLL H L LL LHLHLHL L L L LHL L L H L H H L LLLLLL H L L H L H H H LLLLLLL H H H L X X X Depends upon the address previously applied while LE was at a logic low. H = High Voltage Level, L = Low Voltage Level, X = Don’t Care CD74HC137, CD74HCT137, CD54HC237, CD74HC237, CD74HCT237 |
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