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In 1972, Signetics originally released the 555 timer in DIP-8 and TO5-8 metal can packages, and the 556 timer was released in a DIP-14 package. [ 4 ] In 2006, the dual 556 timer was available in through-hole packages as DIP-14 (2.54 mm pitch), [ 21 ] and surface-mount packages as SO-14 (1.27 mm pitch) and SSOP-14 (0.65 mm pitch).
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Date/Time Thumbnail Dimensions User Comment; current: 21:06, 18 February 2012: 275 × 250 (27 KB): Wdwd: fix connection (dot in the upper left corner) SVG optimization
English: Pinout diagram of the 555 timer IC. Inputs are green, outputs are blue and power pins are red. Inputs are green, outputs are blue and power pins are red. Date
English: Diagram of a bistable circuit made using the 555 timer IC.A low pulse on the trigger line flips to set, and a low pulse on reset flops to reset.
English: Diagram of a monostable circuit made using the 555 timer IC. ... 555 timer IC. A low pulse on the {{overline|trigger}} line starts the monostable.}} ...
Date/Time Thumbnail Dimensions User Comment; current: 21:26, 20 June 2006: 275 × 313 (37 KB): Jjbeard {{Information |Description=Circuit diagram of a 555 Astable circuit with variable mark-space ratio.
English: The NE555 contains 24 bipolar transistors, two diodes and 15 resistors that form six functional blocks: Between the supply voltage VCC (+) and the ground GND (-) is a voltage divider consisting of three identical resistors which, when connected not from the outside, the two reference voltages ¹ / 3 VCC and ² / 3 VCC supplies.