The Fujitsu MB3771 is designed to monitor the voltage level of one or two power supplies (+5 V and an arbitraryvoltage) in a microprocessor circuit, memory board in large-size computer, for example.If the circuit’s power supply deviates more than a specified amount, then the MB3771 generates a reset signal tothe microprocessor. Thus, the computer data is protected from accidental erasure.Using the MB3771 requires few external components. To monitor only a +5 V supply, the MB3771 requires theconnection of one external capacitor. The level of an arbitrary detection voltage is determined by two externalresistors. The MB3771 is available in an 8-pin Dual In-Line, Single In-Line Package or space saving Flat Package.