MB3771PF Fujitsu Microelectronics, Inc., MB3771PF Datasheet
MB3771PF
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MB3771PF Summary of contents
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FUJITSU SEMICONDUCTOR DATA SHEET 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 microprocessor ...
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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 ...
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FUNCTIONAL DESCRIPTIONS Comparators Comp.A and Comp.B apply a hysteresis to the detected voltage, so that when the voltage at either the pin falls below 1.23 V the RESET output signal goes to “low” level Comp. ...
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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 ...
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ELECTRICAL CHARACTERISTICS 1. DC Characteristics Parameter Symbol Power supply current (DOWN) Detection voltage V SAH Hysterisis width Detection voltage Deviation of detection voltage Hysterisis width Input current Output voltage Output sink current CT charge current Input current Detection voltage Deviation ...
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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. SC ...
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APPLICATION CIRCUIT 1. 5V Power Supply Monitor Monitored Detection threshold voltage Power Supply Voltage Monitor (Externally Fine-Tuned Type) The V detection voltage can be adjusted externally. SA Resistance ...
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MB3771 3. Arbitrary Voltage Supply Monitor (1) Case • Detection Voltage can be set by R Detection Voltage = ( • Connect Pin when • ...
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V and 12 V Power Supply Monitor (2 types of power supply monitor V • monitored Detection voltage is about 4 • monitored When ...
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MB3771 Power Supply Monitor with forced RESET input (V RESIN is an TTL compatible input. RESIN Power Supply Monitor with Non-inverted RESET In this case, Comparator C is used to ...
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Dual (Positive/Negative) Power Supply Voltage Monitoring (V Supply) Monitors and a negative (any given level) power supply. R Detection Voltage = Example ...
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MB3771 ( Reference Voltage Generation and 5V Monitoring (No.1) Detection Voltage = 4 the above examples, the output voltage and the detection voltage are determined by the following equations: Output Voltage = ( ...
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Low Voltage and Over Voltage Detection (V V has no hysteresis. When over voltage is detected, RESET is held in the constant time as well as when SH low voltage is detected ...
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MB3771 13. Back-up Power Supply System (V • Use CMOS Logic and connect V • The back-up battery works after CS goes high as V • During t , memory access is prohibited. PO • CS‘s threshold voltage V is ...
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TYPICAL CHARACTERISTICS Power supply current vs. power supply voltage 700 600 500 Ta 400 300 200 25 C 100 Power supply voltage V Power supply current ...
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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 ...
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... ORDERING INFORMATION Part number MB3771P MB3771PS MB3771PF 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 ...
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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 6.20±0.25 1 PIN INDEX (.244±.010) 0.51(.020)MIN 0.25±0.05 ...
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Plastic SIP (SIP-8P-M03) INDEX-1 INDEX-2 +0.30 0.99 –0 +.012 .039 –0 2.54(.100) TYP 1994 FUJITSU LIMITED S08010S-3C-2 C 8-pin Plastic SOP (FPT-8P-M01) +0.25 +.010 6.35 .250 –0.20 –.008 INDEX 1.27(.050) 0.45±0.10 TYP (.018±.004) 3.81(.150)REF "A" 0.10(.004) 2000 FUJITSU ...
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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 and circuit diagrams in this document are presented as examples ...