PDF KA555 Data sheet ( Hoja de datos )

Número de pieza	KA555
Descripción	Single Timer
Fabricantes	Fairchild
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No Preview Available ! KA555 Single Timer Features • High Current Drive Capability (200mA) • Adjustable Duty Cycle • Temperature Stability of 0.005%/°C • Timing From Msec to Hours • Turn Off Time Less Than 2Msec Applications • Precision Timing • Pulse Generation • Time Delay Generation • Sequential Timing www.fairchildsemi.com Description The KA555 is a highly stable controller capable of producing accurate timing pulses. With monos table operation, the time delay is controlled by one external resistor and one capacitor. With astable operation, the frequency and duty cycle are accurately controlled with two external resistors and one capacitor. 8-DIP 1 8-SOP 1 Internal Block Diagram GND 1 R Trigger 2 Comp. RR 8 Vcc Discharging Tr. 7 Discharge Output 3 OutPut Stage F/F Reset 4 Vref 6 Threshold Comp. Control 5 Voltage ©2002 Fairchild Semiconductor Corporation Rev. 1.0.2 1 page KA555 Figure 1 illustrates a monos table circuit. In this mode, the timer generates a fixed pulse whenever the trigger voltage falls below Vcc/3. When the trigger pulse voltage applied to the #2 pin falls below Vcc/3 while the timer output is low, the timer's internal flip-flop turns the discharging Tr. off and causes the timer output to become high by charging the external capacitor C1and setting the flip-flop output at the same time. The voltage across the external capacitor C1, VC1 increases exponentially with the time constant t=RAC and reaches 2Vcc/3 at td=1.1RAC. Hence, capacitor C1 is charged through resistor RA. The greater the time constant RAC, the longer it takes for the VC1 to reach 2Vcc/3. In other words, the time constant RAC controls the output pulse width. When the applied voltage to the capacitor C1 reaches 2Vcc/3, the comparator on the trigger terminal resets the flip-flop, turning the discharging Tr. on. At this time, C1 begins to discharge and the timer output converts to low. In this way, the timer operating in monos table repeats the above process. Figure 2 shows the time constant relationship based on RA and C. Figure 3 shows the general waveforms during monos table operation. It must be noted that, for normal operation, the trigger pulse voltage needs to maintain a minimum of Vcc/3 before the timer output turns low. That is, although the output remains unaffected even if a different trigger pulse is applied while the output is high, it may be affected and the waveform not operate properly if the trigger pulse voltage at the end of the output pulse remains at below Vcc/3. Figure 4 shows such timer output abnormality. Figure 4. Waveforms of Monos table Operation (abnormal) 2. Astable Operation +Vcc 4 RESET 2 TRIG 8 Vcc DISCH 7 THRES 6 RA RB 3 OUT GND CONT 5 C1 RL 1 C2 100 10 1 0.1 0.01 1E-3 100m 1 (RA+2RB) 10 100 1k Frequency(Hz) 10k 100k Figure 5. Astable Circuit Figure 6. Capacitance and Resistance vs. Frequency 5 5 Page Mechanical Dimensions Package 6.40 ±0.20 0.252 ±0.008 #1 #8 8-DIP KA555 Dimensions in millimeters #4 #5 7.62 0.300 5.08 0.200 MAX 3.40 ±0.20 0.134 ±0.008 3.30 ±0.30 0.130 ±0.012 0.33 0.013 MIN 0~15° 0.25 +0.10 –0.05 0.010 +0.004 –0.002 11 11 Page

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