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LS7211 数据表(PDF) 7 Page - LSI Computer Systems |
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LS7211 数据表(HTML) 7 Page - LSI Computer Systems |
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7 / 8 page ![]() FIGURE 9. PROGRAMMABLE ACCURATE REAL-TIME DELAY GENERATION 17 10 11 12 13 14 15 16 18 V DD WB0 WB1 WB2 WB3 WB4 WB5 WB6 WB7 1 2 3 4 10M A B TRIG XTLI 5 XTLO 6 PSCLS 7 RESET 8 9 OUT Vss OUTPUT +V S1 +V 470K ƒ 25pF 25pF TRIGGER IN +V 1s/1m 2s/2m 4s/4m 8s/8m 16s/16m 32s/32m 64s/64m 128s/128m NOTE : Crystal Frequency, ƒ = 32,768Hz Switch: S1 low: Delay increment = 1s; Maximum Delay = 255s S1 high: Delay increment = 1m; Maximum Delay = 255m LS7212 s = seconds m = minutes |
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