GENERAL DESCRIPTION
The SGM803/SGM809/SGM810 supervisory circuits
monitor the power supply voltage in microprocessor and
digital systems. They provide a reset output during
power-up, power-down and brownout conditions. On
power-up, an internal timer holds reset asserted for 240 ms.
This holds the microprocessor in a reset state until
conditions have stabilized. The RESET output remains
operational with V CC as low as 1 V. The SGM803/SGM809
provides an active low reset signal ( RESET ) while the
SGM810 provides an active high signal (RESET) output.
The SGM809/SGM810 have push-pull outputs, whereas the
SGM803 has an open-drain output, which requires an
external pull-up resistor.
Seven reset threshold voltage options are available suitable
for monitoring 2.5V, 3V, 3.3V, and 5V supply voltages.
The reset comparator features built-in glitch immunity,
making it immune to fast transients on V CC .
The low supply current of typically 17 μ A makes the
SGM803/SGM809/SGM810 ideal for use in portable, battery
operated equipment. They are available in the 3-pin SOT23
package.
