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74F269 데이터시트(PDF) 3 Page - NXP Semiconductors |
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74F269 데이터시트(HTML) 3 Page - NXP Semiconductors |
3 / 14 page Philips Semiconductors Product specification 74F269 8–bit bidirectional binary counter 1996 Jan 05 3 LOGIC SYMBOL U/D Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 1 24 11 P0 P1 P2 P3 P4 P5 P6 P7 23456 89 10 23 22 21 20 18 17 16 15 14 TC 12 13 PE CEP CET CP VCC=Pin 19 GND=Pin 7 SF00835 LOGIC SYMBOL (IEEE/IEC) SF00836 & G5 EN6 24 M1[LOAD] 23 22 21 20 18 17 16 15 M4[DOWN] 1 13 12 11 2, 3, 5, 6 +/C7 2, 4, 5, 6– M2[COUNT] M3[UP] [1] [2] [4] [8] [16] [32] [64] [128] 3, 5, 6 CT=256 4, 5, 8 CT=0 14 2 3 4 5 6 8 9 10 CTR DIV 256 1, 7D APPLICATION U/D Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 P0 P1 P2 P3 P4 P5 P6 P7 TC PE CEP CET CP SF00851 U/D Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 P0 P1 P2 P3 P4 P5 P6 P7 TC PE CEP CET CP U/D Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 P0 P1 P2 P3 P4 P5 P6 P7 TC PE CEP CET CP U/D Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 P0 P1 P2 P3 P4 P5 P6 P7 TC PE CEP CET CP Most significant 8-bit counter Least significant 8-bit counter CP U/D PE Figure 1. Synchronous Multistage Counting Scheme MODE SELECT FUNCTION TABLE INPUTS OUTPUTS OPERATING MODE CP U/D CEP CET PE Pn Qn TC OPERATING MODE ↑ X X X l l L (a) Parallel load ↑ X X X l h H (a) Parallel load ↑ h l l h X Count Up (a) Count Up ↑ l l l h X Count Down (a) Count Down ↑ X h l h X qn (a) Hold (do nothing) ↑ X X h h X qn H Hold (do nothing) H = High voltage level h = High voltage level one setup prior to the Low-to-High clock transition L = Low voltage level l = Low voltage level one setup time prior to the Low-to-High clock transition q = Lower case letters indicate the state of the referenced output prior to the Low-to-High clock transition X = Don’t care ↑ = Low-to-High clock transition (a) = TC is Low when CET is Low and the counter is at Terminal Count. Terminal Count Up is with all Qn outputs High and Terminal Count Down is with all Qn outputs Low. |
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