MB3771_06 Datasheet, PDF (1/21 Pages) Fujitsu Component Limited. – Power Supply Monitor

FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27400-11E
ASSP For power supply applications
BIPOLAR
Power Supply Monitor
MB3771
■ DESCRIPTION
The Fujitsu 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.
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