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Cypress Semiconductor Electronic Components Datasheet

MB3771 Datasheet

Power Supply Monitor

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MB3771
Power Supply Monitor
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. *A
• San Jose, CA 95134-1709 • 408-943-2600
Revised March 16, 2016


Cypress Semiconductor Electronic Components Datasheet

MB3771 Datasheet

Power Supply Monitor

No Preview Available !

MB3771
Contents
Pin Assignment ................................................................ 3
Block Diagram .................................................................. 3
Functional Descriptions ................................................... 4
Function Explanation ....................................................... 4
Absolute Maximum Ratings ............................................ 5
Recommended Operating Conditions ............................ 5
Electrical Characteristics ................................................. 6
DC Characteristics ...................................................... 6
AC Characteristics ....................................................... 7
Application Circuit............................................................ 8
5V Power Supply Monitor............................................ 8
5V Power Supply Voltage Monitor
(Externally Fine-Tuned Type) ...................................... 8
Arbitrary Voltage Supply Monitor ................................. 9
5 V and 12 V Power Supply Monitor (2 types of power
supply monitor VCC1 = 5 V, VCC2 =12 V) ................ 10
5 V and 12 V Power Supply Monitor (RESET signal
is generated by 5 V, VCC1 = 5 V, VCC2 = 12 V) ...... 10
5 V Power Supply Monitor with forced RESET
input (VCC = 5 V) ...................................................... 11
5 V Power Supply Monitor with
Non-inverted RESET ................................................. 11
Supply Voltage Monitoring with Delayed Trigger ...... 11
Dual (Positive/Negative) Power Supply
Voltage Monitoring (VCC = 5 V,
VEE = Negative Power Supply) ................................ 12
Reference Voltage Generation and
Voltage Sagging Detection ........................................ 12
Low Voltage and Over Voltage
Detection (VCC = 5 V) ............................................... 14
Detection of Abnormal State of Power
Supply System (VCC = 5 V) ...................................... 14
Back-up Power Supply System (VCC = 5 V) ............ 15
Typical Characteristics .................................................. 17
Notes on Use ................................................................... 19
Ordering Information ...................................................... 19
RoHS Compliance Information of
Lead (Pb) Free version ................................................... 19
Marking Format (Lead Free version) ........................... 20
Labeling Sample (Lead free version) ........................... 20
MB3771PF-❏❏❏E1 Recommended Conditions
of Moisture Sensitivity Level ......................................... 21
Package Dimensions ...................................................... 22
Document History ........................................................... 23
Document Number: 002-08511 Rev. *A
Page 2 of 24


Part Number MB3771
Description Power Supply Monitor
Maker Cypress Semiconductor
Total Page 24 Pages
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