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NE556D

ST Microelectronics
Part Number NE556D
Manufacturer ST Microelectronics
Published May 7, 2005
Description General-purpose dual bipolar timer
Detailed Description NE556 SA556 - SE556 General-purpose dual bipolar timers Features ■ Low turn-off time ■ Maximum operating frequency grea...
Datasheet PDF File NE556D PDF File

NE556D
NE556D


Overview
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) Discharge 1 Threshold 2 Control Voltage 3 Reset 4 Output 5 Trigger 6 GND 7 14 VCC 13 Discharge 12 Threshold 11 Control Voltage 10 Reset 9 Output 8 Trigger January 2009 Rev 2 1/16 www.
st.
com 16 Schematic diagrams 1 Schematic diagrams Figure 1.
Block diagram VCC+ THRESHOLD CONTROL VOLTAGE TRIGGER RESET 5kW COMP R FLIP-FLOP 5kW Q COMP S INHIBIT/ RESET 5kW S NE556 - SA556 - SE556 DISCHARGE OUT 1/2 NE556 Figure 2.
Schematic diagram THRESHOLD COMPARATOR VCC R1 4.
7kW R2 R3 830W 4.
7kW CONTROL VOLTAGE 5 R4 R8 1kW 5kW Q19 Q5 Q6 Q7 Q8 Q9 THRESHOLD TRIGGER RESET DISCHARGE GND R11 5kW Q1 Q2 Q4 Q3 R9 Q11 Q12 5kW D2 2 Q10 Q13 Q16 4 Q15 7 Q14 1 R5 10kW R6 100kW R7 100kW Q17 R10 5kW OUTPUT R12 6.
8kW Q21 Q20 Q22 R13 3.
9kW R17 4.
7kW Q23 D1 3 R14 220W Q24 Q18 R16 100W R15 4.
7kW TRIGGER COMPARATOR FLIP FLOP 2/16 NE556 - SA556 - SE556 Absolute maximum ratings and operating conditions 2 Absolute maximum ratings and operating conditions Table 1.
Absol...


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