SGM811

SGM811/SGM812 Microprocessor Supervisory Circuits with Manual Reset Input GENERAL DESCRIPTION The SGM811/SGM812 supervisory circuits monitor the power supply voltage in microprocessor and digital systems. The SGM811/SGM812 are designed to monitor eight different voltages; these voltages have been selected for the effective monitoring of 1.8V, 2.5V, 3V, 3.3V and 5V supply voltage levels. They provide a reset output during power-up, powerdown and brownout conditions. On power-up, an internal timer holds reset asserted for 240ms. This holds the microprocessor in a reset state until conditions have stabilized. The nRESET output remains operational with VCC as low as 1V. The SGM811 provides an active low reset signal (nRESET) while the SGM812 provides an active high signal (RESET) output. Included in this circuit is a manual reset input. The manual reset function is very useful, especially if the circuit in which the SGM811/SGM812 is operating enters into a state that can only be detected by the user. Allowing the user to reset a system manually can reduce the damage or danger that could otherwise be caused by an out-of-control or locked system. The devices come in SOT-143 and SOT-23-5 packages. FEATURES ● Superior Upgrade for MAX811/MAX812 and ADM811/ADM812 ● Full Specified over Temperature ● Low Power Consumption: 13μA (TYP) ● Precision Voltage Monitor: 1.8V, 2.5V, 3V, 3.3V and 5V Options ● Reset Assertion Down to 1V VCC ● 150ms (MIN) Power-On Reset Logic Low nRESET Output (SG...