555

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555
Ground1 8V+
Trigger2 7Discharge
Output3 6Threshold
Reset4 5CV

The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation and oscillator applications. The part is still in widespread use, thanks to its ease of use, low price and good stability. As of 2003, it is estimated that 1 billion units are manufactured every year.

List of integrated circuits
Opamps Single: 741 · LM308 · NE5534 · TL0x1 · Dual: 4558 · LM358 · LF353 · LF442 · NE5532 · OPA2134 · TL0x2 · Quad: TL0x4
OTA Single: CA3080 · CA3094 · Dual: LM13x00
CMOS 4000 4013 · 4046 · 4049 · 4051 · 4052 · 4053 · 4066 · 4069 · 4093 · 40106
Delay BBD: MN3001 · MN3005 · MN3007 · MN3008 · MN3205 · MN3207 · MN3208 · SAD512 · SAD1024 · Digital: PT2399
Power Voltage regulators: 78xx · 79xx · LM317 · LM337 · Charge pumps: ICL7660 · LT1054 · MAX1044
Programmable Atmel AVR MCUs · Microchip PIC MCUs
Misc 555 · LM386 · LM391x