MB3773P Fujitsu, MB3773P Datasheet
MB3773P
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MB3773P Summary of contents
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... FUJITSU SEMICONDUCTOR DATA SHEET ASSP Power Supply Monitor with Watch-Dog Timer MB3773 DESCRIPTION MB3773 generates the reset signal to protect an arbitrary system when the power-supply voltage momentarily is intercepted or decreased for the power-supply voltage watch and “Power on reset” is generated at the normal return of the power supply. MB3773 sends the microprocessor the reset signal when decreasing more than the voltage, which the power supply of the system specified, and the computer data is protected from an accidental deletion ...
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MB3773 PIN ASSIGNMENT (TOP VIEW RESET 3 CK GND 4 (DIP-8P-M01) (FPT-8P-M01) 2 RESET 8 RESET REF RESET (FRONT VIEW GND 4 ...
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BLOCK DIAGRAM : = 1.24 V Reference Voltage Generator : = 100 k COMP Inhibit 1.2 A COMP.O : ...
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MB3773 FUNCTIONAL DESCRIPTIONS Comp.S is comparator including hysteresis. it compare the reference voltage and the voltage of Vs, so that when the voltage of Vs terminal falls below approximately 1.23 V, reset signal outputs. Instantaneous breaks or drops in the ...
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MB3773 Basic Operation RESET T RESET CK GND 0 RESET (1) (2) Logic Circuit T (ms 1000 · ...
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MB3773 OPERATION SEQUENCE (1) When Vcc rises to about 0.8 V, RESET goes “Low” and RESET goes “High”. The pull-up current of approximately 1 A (Vcc = 0 output from RESET. (2) When Vcc rises ...
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... No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representatives beforehand. Rating Symbol ...
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MB3773 ELECTORICAL CHARACTERISTICS (1) DC Characteristics Parameter Supply current Detection voltage Hysteresis width Reference voltage Reference voltage change rate Reference voltage output loading change rate CK threshold voltage CK input current C discharge current T High level output voltage Output ...
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Characteristics Parameter V input pulse width CC CK input pulse width CK input frequency Watch dog timer watching time Watch dog timer reset time Rising reset hold time Output propagation delay time from V CC Output rising time* Output ...
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MB3773 TYPICAL CHARACTERISTIC CURVES Supply current vs. Supply voltage 0. 0.65 0. 0.25 0.15 0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 Supply ...
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High level output voltage vs. High level output current (RESET 5 4 High level output current OH2 Reference voltage vs. Supply voltage 1.246 Ta 1.244 Ta ...
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MB3773 (Continued) Reset time vs. Temperature (At watch dog timer Temperature terminal capacitance T vs. Watchdog timer watching time ...
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APPLICATION CIRCUIT EXAMPLE 1: Monitoring 5V Supply Voltage and Watchdog Timer VCC (5V Notes : Supply voltage is monitored using V Detection voltage are V EXAMPLE 2: 5V Supply Voltage Monitoring (external fine-tuning type) V (5V) CC MB3773 ...
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MB3773 EXAMPLE 3: With Forced Reset (with reset hold) ( Note : Grounding pin 7 at the time sets RESET (pin 8) to Low and RESET (pin 2) to High. ( ...
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EXAMPLE 4: Monitoring Two Supply Voltages (with hysteresis, reset output and NMI) V (12 V) CC2 CC1 MB3773 1 5 Example ...
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MB3773 EXAMPLE 5: Monitoring Two Supply Voltages (with hysteresis and reset output) V (12 V) CC2 Example : Comp. 1, Comp MB4204, MB47393 Notes : When either ...
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EXAMPLE 6: Monitoring Low voltage and Overvoltage Monitoring (with hysteresis MB3773 1 Notes : Comp. 1 and Comp. 2 are used to monitor for overvoltage while ...
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MB3773 EXAMPLE 7: Monitoring Supply Voltage Using Delayed Trigger Note : Adding voltage such as shown in the figure to V width MB3773 ...
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EXAMPLE 8: Stopping Watch-dog Timer (Monitoring only supply voltage) These are example application circuits in which the MB3773 monitors supply voltage alone without resetting the microprocessor even if the latter, used in standby mode, stops sending the clock pulse to ...
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MB3773 (Continued) (c) Using NPN transistor (d) Using PNP transistor MB3773 ...
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EXAMPLE 9: Reducing Reset Hold Time MB3773 (a) T reduction method PR Notes : RESET is the only output that can be used. Standard T ...
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MB3773 EXAMPLE 10: Circuit for Monitoring Multiple Microprocessor FF1 RESET RESET RESET RESET CK CK GND GND *: Microprocessor Notes : connects from FF1 and FF2 outputs Q ...
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Description of Application Circuits Using one MB3773, this application circuit monitors multiple microprocessor in one system. Signals from each microprocessor are sent to FF1, FF2 and FF3 clock inputs. Figure 2 shows these timings. Each flip-flop operates using signals sent ...
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MB3773 EXAMPLE 11: Circuit for Limiting Upper Clock Input Frequency Notes : This is an example application to limit upper frequency f the microprocessor. If the CK cycle sent from the microprocessor exceeds f ...
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... 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 MB3773P MB3773PS MB3773PF resistors in series. Package 8-pin plastic DIP (DIP-8P-M01) 8-pin plastic SIP (SIP-8P-M03) 8-pin plastic SOP ...
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... 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 (.010±.002) 0.46±0.08 (.018±.003) +0 ...
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... FUJITSU LIMITED F08002S-c-6-7 C Note These dimensions include resin protrusion. Note These dimensions do not include resin protrusion. Note 3 : Pins width and pins thickness include plating thickness. Note 4 : Pins width do not include tie bar cutting remainder. ...
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... MB3773 (Continued) 8-pin 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 +0.15 19.65 –0.35 +.006 .774 –.014 6.20±0.25 (.244±.010) 8.20±0.30 (.323±.012) 4.00±0.30 (.157±.012) +0.30 1.52 0.50±0.08 –0 +.012 (.020±.003) .060 – ...
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... Fujitsu or any third party or does Fujitsu warrant non-infringement of any third-party’s intellectual property right or other right by using such information. ...