Description

The AS1907/AS1908/AS1909 microprocessor supervisory circuits are ideal for monitoring the supply voltage of digital systems and microprocessors.

The devices are designed to initiate a reset if the supply voltage goes below a predefined threshold. The duration of the reset is either 1.5, 30, or 150ms (typ.) after the supply voltage has risen above the pre-set threshold.

The devices are available as the following standard products:

	Model	Output Type	Reset Type
	AS1907	Push/Pull	Active-Low
	AS1908	Push/Pull	Active-High
	AS1909	Open-Drain	Active-Low

The reset thresholds are factory-set between 1.6 and 2.5V in steps of approximately 100mV.

The devices exhibit excellent reliability, and can reduce system costs by eliminating the need for external components. The extremely low current consumption makes the devices ideal for use in portable applications.

The integrated reset comparator was specifically designed to ignore fast transients on VCC.