■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, memoryboard 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 datais 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.