yassin.kraouch
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I can be done purely analog.why it cant be done by a capacitor + resistor?
Something wrong with your pocket calculator? Time constant is 1.6 sec, may result in about 1 sec monostable interval.10megohm and 0.16uf will give you around 180 sec
That's not the right way to read a datasheet. They do specify RC ranges with respective timing in a diagram. Unless otherwise said, you should use the chip within this range, or need to conclude from other specifications that a wider range is possible. There are two restrictions to consider:but they did not give requirement on the capacitor or the resistor? why not it cannot work ? they have no maximum value right ? and also they have no requirement on timing.
Perfectly, e.g. a tiny 6-pin PIC.do you think that with microcontroller it can be done ?
Hi Fvm, i found a solution to avoid discharge capacitor problem, see page 3 of this chip, https://www.fairchildsemi.com/ds/74/74VHC123A.pdf simply i need to add a protection diode.That's not the right way to read a datasheet. They do specify RC ranges with respective timing in a diagram. Unless otherwise said, you should use the chip within this range, or need to conclude from other specifications that a wider range is possible. There are two restrictions to consider:
- peak current/dissipated energy when discharging the capacitor. You should consider that capacitors above a certain value might damage the chip.
- Rt/Ct pin leage currents. There's a specification that raises doubts if 10 Mohm will work.
Perfectly, e.g. a tiny 6-pin PIC.
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