MB3771 Fujitsu, MB3771 Datasheet

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MB3771

Manufacturer Part Number
MB3771
Description
Power Supply Monitor
Manufacturer
Fujitsu
Datasheet

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FUJITSU SEMICONDUCTOR
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 (V
• User selectable threshold level with hysterisis (V
• 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 (V
• Minimal number of external components (one capacitor Min)
• Low power dissipation (I
• Detection threshold voltage has hysteresis function
• Reference voltage is connectable.
PACKAGES
DATA SHEET
8-pin plastic DIP
(DIP-8P-M01)
CC
= 0.35 mA Typ, V
SA
= 4.2 V ± 2.5
CC
= 0.8 V Typ)
CC
= 5 V)
8-pin plastic SIP
)
(SIP-8P-M03)
SB
= 1.23 V ± 1.5
)
8-pin plastic SOP
(FPT-8P-M01)
DS04-27400-9E

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MB3771 Summary of contents

Page 1

... MB3771 DESCRIPTION The Fujitsu MB3771 is designed to monitor the voltage level of one or two power supplies (+5 V and an arbitrary voltage 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 ...

Page 2

... MB3771 PIN ASSIGNMENT (TOP VIEW OUT 3 C GND 4 (DIP-8P-M01) (FPT-8P-M01) BLOCK DIAGRAM 100 Comp RESIN SB Comp (FRONT VIEW) 8 RESET /RESIN (SIP-8P-M03 1.24 V REFERENCE VOLTAGE RESET RESIN GND OUT 1. Comp GND 8 3 OUT RESET C ...

Page 3

... TTL input (Sample Application 6). Note that if Comp.B is not used, the V Instantaneous breaks or drops in the power supply can be detected as abnormal conditions by the MB3771 within interval. However because momentary breaks or drops of this duration do not cause problems in ...

Page 4

... MB3771 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Power supply voltage V V Input voltage V V Power dissipation P Storage temperature Tstg 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. RECOMMENDED OPERATING CONDITIONS ...

Page 5

... IHC ILC + 3 OHC OHC mA OLC OUTC 1 OUTC OLC 0 200 A CCL OLR RESET MB3771 = Value Unit Min Typ Max 350 500 A 400 600 A 4.10 4.20 4.30 V 4.05 4.20 4.35 V 4.20 4.30 4.40 V 4.15 4.30 4. 100 150 mV 1.212 1.230 1.248 V 1.200 1.230 1.260 ...

Page 6

... MB3771 2. AC Characteristics Parameter Symbol input pulse width SA SB Reset hold time RESET rise time RESET fall time Propagation delay time *1: In case of V termination. SB *2: In case of V termination Conditions 2 100 2 PHL 100 PLH ( 0. Value Unit Min Typ Max 5.0 s 0.5 1 ...

Page 7

... V /R [V], V SAL SAH 9 and V SAL SAH MB3771 1 8 RESET circuit 4 5 and R . (See the table below << 100 << [ HYSB Detection voltage 2 3.9 4.37 3.9 4.11 MB3771 1 8 RESET Logic 3 6 Circuit MB3771 Logic ( (V) Detection voltage SAL SAH 4.47 4.20 7 ...

Page 8

... Values are actual measured values (using I reduces the minimum supply voltage of the RESET output, but requires resistance with higher allowable loss and less than 4.45 V. greater than 4. MB3771 and and R changes the constant voltage output, thereby changing the 4 5 resistance). ...

Page 9

... Hysterisis width = ( CC2 V CC1 R : 390 390 k and Detection voltage is about 9.0 V.Generally the MB3771 390 (8. the circuit above (200 mV in the circuit above MB3771 R : 100 510 MB3771 = =12 V) CC1 CC2 RESET Logic circuit = CC1 CC2 . RESET IRQ or Port Logic Circuit 9 ...

Page 10

... Supply Voltage Monitoring with Delayed Trigger When the voltage shown in the diagram below is applied at V increased (when C = 1000 pF). 1 The formula for calculating the minimum value of the input pulse width [ [pF MB3771 MB3771 the minimum value of the input pulse width MB3771 RESET Logic Circuit is: PI RESET C 1 ...

Page 11

... In the above examples, the output voltage and the detection voltage are determined by the following equations: Detection Voltage = ( 0. and not output necessary to use a Schottky barrier diode (SBD 5.1 k MB3771 SBD MB3771 7 1.2 k MB3771 = Negative Power CC EE should be the same value. 3 RESET RESET mA 300 ...

Page 12

... In the above examples, the output voltage and the detection voltage are determined by the following equations: Output Voltage = ( 0. Reference Voltage Generation and 5 V Monitoring (No. 2) The value of R should be calculated from the current consumption of the MB3771, the current flowing and the 5 V output current. The table below provides sample resistance values for reference ( ...

Page 13

... This Example circuit detects abnormal low/over voltage of power supply voltage and is indicated by LED indicator. LED is reset by the CLEAR key. • The detection levels of low/over voltages are determined MB3771 and R SA LED MB3771 R : 620 100 MB3771 R 1 RESET R 2 and R respectively CLEAR 13 ...

Page 14

... V or less, connect 7 pin with V 1 When more, 7 pin can be used to open. 1 • The voltage to change V is provided as the following equation However, please set more MB3771 Diode has been added to prevent Comp.C from malfunctionig when V Set V and V with care given characteristics CMOS logic with V ...

Page 15

... Detection voltage (V 1.30 1.25 1. (V) CC Anbient temperature Detection voltage (V 1.30 1.25 1. (V) CC Anbient temperature Detection voltage (V 4.5 4.4 4.3 4.2 4.1 4 Anbient temperature (V) CC MB3771 ) vs. anbient temperature 100 ) vs. anbient temperature SB V SBH V SBL 100 ) vs. anbient temperature SA V SAH V SAL 100 (Continued) 15 ...

Page 16

... MB3771 (Continued) Detection voltage ( vs. Power supply voltage SB SC 1.27 V SBH 1. 1.25 1.24 V SBL 1.23 1.22 1.21 1. Power supply voltage V Reset hold time vs. power supply voltage (C 1 1 Power supply voltage V C pin capacitance vs. reset hold time 100 100 100 p 1000 p 0.01 ...

Page 17

... Do not apply a negative voltage - Applying a negative voltage of 0 less to an LSI may generate a parasitic transistor, resulting in malfunction. ORDERING INFORMATION Part number MB3771P MB3771PS MB3771PF resistors in series. Package 8-pin Plastic DIP (DIP-8P-M01) 8-pin Plastic SIP (SIP-8P-M03) 8-pin Plastic SOP (FPT-8P-M01) MB3771 Remarks 17 ...

Page 18

... MB3771 PACKAGE DIMENSIONS 8-pin Plastic DIP (DIP-8P-M01) 4.36(.172)MAX 3.00(.118)MIN +0.30 0.99 –0 +.012 .039 –0 +0.35 0.89 –0.30 +.014 .035 –.012 1994 FUJITSU LIMITED D08006S-2C +0.40 9.40 –0.30 +.016 .370 –.012 1 PIN INDEX 6.20±0.25 (.244±.010) 0.51(.020)MIN 0.25± ...

Page 19

... Dimensions in mm (inches) . Note : The values in parentheses are reference values. MB3771 3.26±0.25 (.128±.010) 0.25±0.05 (.010±.002) (Continued) 19 ...

Page 20

... MB3771 (Continued) 8-pin Plastic SOP (FPT-8P-M01) +0.25 +.010 * 1 6.35 .250 –0.20 –.008 8 INDEX 1 1.27(.050) 0.10(.004) 0.10(.004) 2002 FUJITSU LIMITED F08002S-c-6 Note These dimensions include resin protrusion. Note These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. ...

Page 21

... MB3771 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of Fujitsu semiconductor device ...

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