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N74F842D Datasheet(PDF) 7 Page - NXP Semiconductors |
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N74F842D Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 18 page Philips Semiconductors Product specification 74F841/74F842/74F843/ 74F845/74F846 Bus interface latches 1999 Jun 23 7 LOGIC DIAGRAM for 74F843 1 OE VCC = Pin 24 GND = Pin 12 LQ C DP Q0 23 13 LE 11 MR 14 PRE D0 2 LQ C DP Q1 22 D1 3 LQ C DP Q2 21 D2 4 LQ C DP Q3 20 D3 5 LQ C DP Q4 19 D4 6 LQ C DP Q5 18 D5 7 LQ C DP Q6 17 D6 8 LQ C DP Q7 16 D7 9 LQ C DP Q8 15 D8 10 SF01299 FUNCTION TABLE for 74F843 INPUTS OUTPUTS INPUTS 74F843 OPERATING MODE OE PRE MR LE Dn Qn L L X X X H Preset L H L X X L Clear L H H H L L Transparent L H H H H H Transparent L H H ↓ l L Latched L H H ↓ h H Latched H X X X X Z High Impedance L H H L X NC Hold H = High voltage level L = Low voltage level h = High state one setup time before the High-to-Low LE transition l = Low state one setup time before the High-to-Low LE transition ↓ = High-to-Low transition X = Don’t care NC= No change Z = High impedance “off” state |
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