MB3771
Power Supply Monitor

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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.

Parameter Symbol Rating Unit
Min. Max.
Power supply voltage VCC –0.3 +20 V
Input voltage VSA –0.3 VCC + 0.3 ( < +20) V
VSB –0.3 +20 V
VSC -0.3 +20 V
Power dissipation PD 200 (Ta≤85 °C) mW
Storage temperature Tstg –55 +125 °C
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
                  temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
• Precision voltage detection (VSA = 4.2 V ± 2.5 %)
• User selectable threshold level with hysterisis (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 hyst

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Datasheet

Size: 183.82KB
Page: 20
PDF: MB3771.pdf
  • Description:
    Power Supply Monitor
  • MFG:
    FUJITSU [Fujitsu Media Devices Limited]
 

Abstract


DS04-27400-7E
FUJITSU SEMICONDUCTOR
DATA SHEET
ASSP For power supply applications
BIPOLAR
Power Supply Monitor
MB3771
nnnn 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.
nnnn FEATURES
? Precision voltage detection (VSA = 4.2 V ± 2.5 %)
? User selectable threshold level with hysterisis (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.
nnnn PACKAGES
8-pin plastic DIP 8-pin plastic SIP 8-pin plastic SOIP
(DIP-8P-M01) (SIP-8P-M03) (FPT-8P-M01)

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