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www.SiliconStandard.com 1 of 7 Microprocessor Voltage Monitor with Manual Reset Features Precision monitoring of +3V, +3.3V, and +5V power-supply voltages Fully specified over temperature Available in two output configurations Push-pull RESET output (SS8039L) Push-pull RESET output (SS8039H) Manual reset input Power-on reset pulse width of 140ms min Supply current of 5µA Guaranteed reset valid to VCC = +1V Power supply transient immunity No external components 4-Pin SOT-143 package Applications Computers Controllers Intelligent instruments Critical µP and µC power monitoring Portable / battery-powered equipment Automotive General Description The SS8039 is a microprocessor (µP) supervisory circuit used to monitor the power supplies in µP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V- pow- ered circuits. These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The SS8039 has a push-pull output stage. The SS8039L has an active-low RESET output, while the SS8039H has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V. Low supply current makes the SS8039 ideal for use in portable equipment, and it is available in a 4-pin SOT-143 package. Pin Configuration Typical Application Rev.2.02 1/06/2004 Compatible with the popular "811" series RESET INPUT GND V CC RESET (RESET) GND V CC V CC MR RESET INPUT GND V CC RESET (RESET) GND V CC V CC MR RESET INPUT GND µP V CC RESET (RESET) GND SS8039 V CC V CC MR V CC 4 GND 2 RESET(RESET) MR 3 1 V CC 4 GND 2 RESET(RESET) MR 3 1 V CC SOT143 SS8039 4 GND 2 RESET(RESET) MR 3 (RESET) for SS8039H 1 (RESET) for SS8039H SS8039 |
