The LM556 dual-timing circuit is a highly-stable controller capable of producing accurate
time delays or oscillation. The LM556 device is a dual-timing version of the LM555 device. Timing
is provided by an external resistor and capacitor for each timing function. The two timers operate
independently of each other, sharing only VCC and ground. The circuits may
be triggered and reset on falling waveforms. The output structures may sink or source 200 mA.
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