View max821 m datasheet:

19-1122; Rev 2; 5/00 4-Pin µP Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay General Description Features The MAX821/MAX822 microprocessor (µP) supervisory ¦ Pin-Selectable, Precision Power-On Reset Delay: circuits monitor power supplies in µP and digital sys- 1ms (max), 20ms (min), or 100ms (min) tems. They provide excellent circuit reliability and low ¦ Precision Monitoring of +3V to +5V Power-Supply cost by eliminating external components and adjust- Voltages ments when used with 5V-powered or 3V-powered cir- cuits. The MAX821/MAX822 also provide a power-on ¦ 2.5µA Supply Current reset timeout delay that is pin selectable to 1ms (max), ¦ Guaranteed Over Temperature (-40°C to +125°C) 20ms (min), or 100ms (min). ¦ Guaranteed RESET Valid to VCC = 1V (MA