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N74F821N Datasheet(PDF) 8 Page - NXP Semiconductors |
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N74F821N Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 18 page Philips Semiconductors Product specification 74F821/822/823/824/825/826 Bus interface registers 1996 Jan 05 8 LOGIC DIAGRAM FOR 74F824 VCC = Pin 24 GND = Pin 12 D0 D R Q Q0 2 23 D1 Q1 3 22 D2 Q2 4 21 D3 Q3 5 20 D4 Q4 6 19 D5 Q5 7 18 D6 Q6 8 17 D7 Q7 9 16 D8 Q8 10 15 11 MR CP CE 14 SF00503A 1 OE 13 CP D R Q CP D R Q CP D R Q CP D R Q CP D R Q CP D R Q CP D R Q CP D R Q CP FUNCTION TABLE for 74F823 and 74F824 INPUTS OUTPUTS INPUTS 74F823 74F824 OPERATING MODE OE MR CE* CP Dn Q Q L L X X X L L Clear L H L ↑ h H L Load and read data L H L ↑ l L H Load and read data L H H X X NC NC Hold H X X X X Z Z High impedance H = High-voltage level h = High state must be present one setup time before the low-to-high clock transition L = Low-voltage level l = Low state must be present one setup time before the low-to-high clock transition NC= No change X = Don’t care Z = High impedance “off” state * = Since CE input is sensitive to very short (<3ns) high-to-low-to-high going spikes while CP is high, users should avoid the use of decoders or other potentially glitch prone device on the CE input. ↑ = Low-to-high clock transition LOGIC DIAGRAM FOR 74F825 VCC = Pin 24 GND = Pin 12 D0 D R Q Q0 3 22 D1 Q1 4 21 D2 Q2 5 20 D3 Q3 6 19 D4 Q4 7 18 D5 Q5 8 17 D6 Q6 9 16 D7 Q7 10 15 11 MR CP CE 14 1 OE0 SF00504A 13 CP 23 2 OE1 OE2 D R Q CP D R Q CP D R Q CP D R Q CP D R Q CP D R Q CP D R Q CP |
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