GENERAL DESCRIPTION
The MIC1555 can be used as an astable (oscillator) or monostable (one-shot) with separate threshold and trigger inputs. In the one-shot mode, the output pulse width is precisely controlled by an external resistor and a capacitor. Time delays may be accurately controlled from microseconds to hours. In the oscillator mode, the output is used to provide precise feedback, with a minimum of one resistor and one capacitor producing a 50% duty cycle square wave. The MIC1557 is designed for astable (oscillator) operation only, with a chip select/reset (CS) input for low power shutdown. One resistor and one capacitor provide a 50% duty cycle square wave. Other duty-cycle ratios may be produced using two diodes and two resistors. The MIC1555/7 is powered from a +2.7V to +18V supply voltage and is rated for –40°C to +85°C ambient temperature range. The MIC1555/7 is available in SOT-235, and thin SOT23-5 5-pin packages. A low profile, ultrathin, (UTDFN), version of the MIC1555 (with chip select) is also available.
Micrel
