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LM555C データシート(PDF) 4 Page - Intersil Corporation |
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LM555C データシート(HTML) 4 Page - Intersil Corporation |
4 / 6 page 4 Figure 2 shows the typical waveforms generated during this mode of operation, and Figure 3 gives the family of time delay curves with variations in R1 and CT. Repeat Cycle Timer (Astable Operation) Figure 4 shows the CA555 connected as a repeat cycle timer. In this mode of operation, the total period is a function of both R1 and R2. T = 0.693 (R1 + 2R2) CT = t1 + t2 where t1 = 0.693 (R1 + R2) CT and t2 = 0.693 (R2) CT the duty cycle is: Typical waveforms generated during this mode of operation are shown in Figure 5. Figure 6 gives the family of curves of free running frequency with variations in the value of (R1 +2R2) and CT. tD 3V 3.3V 5V 0 0 0 SWITCH S1 “OPEN” SWITCH S1 “CLOSED” INPUT VOLTAGE (TERMINAL 2) CAPACITOR VOLTAGE (TERMINALS 6, 7) OUTPUT VOLTAGE (TERMINAL 3) FIGURE 2. TYPICAL WAVEFORMS FOR RESET TIMER TIME DELAY(s) 10 1 10-1 0.1 0.01 0.001 TA = 25 oC R1 = 1kΩ 10k Ω 1 10 100 V+ = 5V 100k Ω 1M Ω 10M Ω 10-2 10-3 10-4 10-5 FIGURE 3. TIME DELAY vs RESISTANCE AND CAPACITANCE 1 CA555 EO 8 5 2 6 7 3 4 R1 CT 0.01 µF RELAY COIL R2 V+ 5V FIGURE 4. REPEAT CYCLE TIMER (ASTABLE OPERATION) t 1 t 1 t 2 + ---------------- = R 1 R 2 + R 1 2R 2 + ------------------------ CA555, CA555C, LM555C |
同様の部品番号 - LM555C |
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同様の説明 - LM555C |
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