AS1905

The AS1904/AS1905/6 family is an ultra low-power supervisory circuit device.

The device can be used to monitor the supply voltage of digital systems and microprocessors and initiate a reset when the voltage goes below a predefined threshold. The duration of the reset is 5/20/100/500ms (typ.) after the supply voltage has risen above the threshold.

The AS1905 exhibits excellent reliability and can reduce application costs by eliminating all external components.

The device is available with different output drivers:

• The AS1904 has a push-pull driver with an active low reset.
• The AS1905 uses the same output stage as the AS1904, but has an active high reset.
• The AS1906 has an open drain output with active low reset.

All devices operate down to a voltage of 1V.

The reset thresholds of AS1905 are factory-trimmable between 2.2V and 3.08V in steps of approximately 100mV.

Each device of the AS1904/5/6 family is offered with four time-out periods of 5/20/100/500ms.

The extremely low current consumption of only 150nA (typ) at 3.3V makes the device ideal for use in portable applications.

All devices are available in a 3-pin SOT23 package.