DescriptionThe NE556, SA556 and SE556 dual monolithic timing circuits are highly stable controllers capable of producing accurate time delays or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor.gered and reset on falling waveforms, and the output structure can source or sink up to 200mA.N DIP14(Plastic package)D SO14(Plastic micropackage)Pin connections(top view) ! "# ! www.st.comSchematic diagramsNE556 - SA556 - SE5562/16 1 Schematic diagramsFigure 1.Block diagramFigure 2.Schematic diagram$!%&$' () * * * !+""%! ! ,'+)-,') &. +&$/!"% 0 +#$+1+2 !%&% !%&%() &#!' '/"% 2#% 0)0#!' '/"% $!%&$' ()/!/! ! 4* ! ... ! 4* ! * ! * ... ... . $!%&$' !+""%! !%&% +&$/!"% "# .. ! * ! * ! * ! * ... ! * ! ! 4* ! .. ! 4* . ... ! 4* !+""%!()/!/!,'+),') ! * 4* NE556 - SA556 Features Low turn-off timeMaximum operating frequency greater than 500kHz Timing from microseconds to hoursOperates in both astable and monostable modes Output can source or sink up to 200mAAdjustable duty cycleTTL compatibleTemperature stability of 0.005% per CDescriptionThe NE556, SA556 and SE556 dual monolithic timing circuits are highly stable controllers capable of producing accurate time delays or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor.gered and reset on falling waveforms, and the output structure can source or sink up to 200mA.N DIP14(Plastic package)D SO14(Plastic micropackage)Pin connections(top view) ! "# ! www.st.comSche