a few years ago I designed a circuit using an NE555 D timer. After a few days or months, the timer fails in the follwing way:
Pin 2 seems shorted to ground, internally.Providing a 1k path to VCC does not "pull up" the voltage, I think there's a short to ground
Pins 6&7 Remain high, and the discharge transistor in the 555 doesn't seem to reset the external timing cap, even though it's voltage is close to VCC
Pin 3 remains high
Pin 2 seems shorted to ground, internally.Providing a 1k path to VCC does not "pull up" the voltage, I think there's a short to ground
Pins 6&7 Remain high, and the discharge transistor in the 555 doesn't seem to reset the external timing cap, even though it's voltage is close to VCC
Pin 3 remains high