MB3771

MB3771 Power Supply Monitor Description The Cypress MB3771 is designed to monitor the voltage level of one or two power supplies (+5 V and an arbitrary voltage) 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 to the 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 the connection of one external capacitor. The level of an arbitrary detection voltage is determined by two external resistors. The MB3771 is available in an 8-pin Dual In-Line, Single In-Line Package or space saving Flat Package. Features ■ Precision voltage detection (VSA = 4.2 V ± 2.5 %) ■ User selectable threshold level with hysteresis (VSB = 1.23 V ± 1.5 %) ■ Monitors the voltage of one or two power supplies (5 V and an arbitrary voltage, >1.23 V) ■ Usable as over voltage detector ■ Low voltage output for reset signal (VCC = 0.8 V Typ) ■ Minimal number of external components (one capacitor Min) ■ Low power dissipation (ICC = 0.35 mA Typ, VCC = 5 V) ■ Detection threshold voltage has hysteresis function ■ Reference voltage is connectable. ■ One type of package (SOP-8pin : 1 type) Application ■ Industrial Equipment ■ Arcade Amusement etc. Cypress Semiconductor Corporation 198 Champion Court Document Number: 002-08511 Rev. *D San Jose, CA 9513...