NE556DT;SA556DT;NE556N;SA556N;NE556D;中文规格书,Datasheet资料.pdfVIP

January 2009 Rev 2 1/16 16 NE556 SA556 - SE556 General-purpose dual bipolar timers Features ■ Low turn-off time ■ Maximum operating frequency greater than 500 kHz ■ Timing from microseconds to hours ■ Operates in both astable and monostable modes ■ Output can source or sink up to 200 mA ■ Adjustable duty cycle ■ TTL compatible ■ Temperature stability of 0.005% per °C Description The 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. The circuits may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200 mA. N DIP14 (Plastic package) D SO14 (Plastic micropackage) Pin connections (top view)                        !     #           !  / Schematic diagrams NE556 - SA556 - SE556 2/16 1 Schematic diagrams Figure 1. Block diagram Figure 2. Schematic diagram $!%$ () * * * !+%! ! ,+)-,) . +$/!% 0 +#$+1+2 !%% !%% () 3 #!/%  2#% 0)0 #! /% $!%$ ()/!/!  ! 4* !  . . . . . ! 4* ! * ! * . . . . . . . . $!%$ !+%! !%% +$/!% #     . . ! * ! * ! * ! * . . . ! *  !  ! 4* !  . . ! 4*  .   . . . ! 4*  !+%!()/!/! ,+),) ! * 4* / NE556 - SA556 - SE556 Absolute maximum ratings and operating conditions 3/16 2 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol Parameter Value Unit VCC Supply voltage 18 V I