Datenblatt-Suchmaschine für elektronische Bauteile |
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CA0555T Datenblatt(PDF) 4 Page - Harris Corporation |
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CA0555T Datenblatt(HTML) 4 Page - Harris Corporation |
4 / 6 page 8-6 Since the charge rate and threshold level of the comparator are both directly proportional to V+, the timing interval is rel- atively independent of supply voltage variations. Typically, the timing varies only 0.05% for a 1V change in V+. Applying a negative pulse simultaneously to the reset termi- nal (4) and the trigger terminal (2) during the timing cycle discharges CT and causes the timing cycle to restart. Momentarily closing only the reset switch during the timing interval discharges CT, but the timing cycle does not restart. 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. 1 CA555 EO 8 5 2 6 7 3 4 680 RESET R1 CT 4.7K 680 10K 0.01 µF RELAY COIL 1N4001 V+ 5V S1 START NOTE: All resistance values are in ohms. FIGURE 1. RESET TIMER (MONOSTABLE OPERATION) 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, LM555, LM555C, NE555 |
Ähnliche Teilenummer - CA0555T |
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Ähnliche Beschreibung - CA0555T |
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