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The DS1836 MicroManager performs three vital system functions. First a precision temperaturecompensated reference and comparator circuit monitor the status of the voltage on VCC and when an outof- tolerance condition is detected, an internal power-fail signal is generated which forces the reset active. If VCC continues to degrade it switches to the battery supply when VCC drops below 3.8 volts (2.6 volts for 3.3-volt versions). When VCC exceeds 3.9 volts (2.8 volts for 3.3-volt versions); VOUT will again be supplied from VCC. Reset will remain active for 350 ms after VCC returns to an in-tolerance condition.
Lastly, the DS1836 supports a sense input that sends a non-maskable interrupt whenever the sense input drops below 1.25 volts.
DS1836C Maximum Ratings
Voltage on VCC or VBAT Pin Relative to Ground -0.5V to +7.0V Voltage on any I/O Pin Relative to Ground** -0.5V to VOUT + 0.5V Operating Temperature -40°C to +85°C Storage Temperature -55°C to +125°C Soldering Temperature 260°C for 10 seconds
DS1836C Features
5-volt or 3.3-volt power-on reset True 3-volt operation power switch Switches to battery at 3.8 volts (2.6 volts for 3.3-volt versions) Excellent for systems designed to operate with dual power supplies Asserts resets during power transients Maintains reset for 350 ms after VCC returns to an in-tolerance condition Reduces need for discrete components Precision temperature-compensated voltage reference and voltage sensor 8-pin DIP or space saving 8-pin SOIC surface mount available CMOS reset output for low current operation Operating temperature of -40°C to +85°C Perfect for PIC microprocessor applications