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MAX705C/D Arkusz danych(PDF) 8 Page - Maxim Integrated Products |
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MAX705C/D Arkusz danych(HTML) 8 Page - Maxim Integrated Products |
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8 / 12 page ![]() Interfacing to μPs with Bidirectional Reset Pins μPs with bidirectional reset pins, such as the Motorola 68HC11 series, can contend with the MAX705–MAX708 RESET output. If, for example, the RESET output is driven high and the μP wants to pull it low, indeterminate logic levels may result. To correct this, connect a 4.7kΩ resistor between the RESET output and the μP reset I/O, as in Figure 8. Buffer the RESET output to other system components. Figure 5. RESET Valid to Ground Circuit Figure 7. Monitoring a Negative Voltage Figure 6. Monitoring Both +5V and +12V Figure 6. Monitoring Both +5V and +12V MAX70_ RESET R1 MAX70_ RESET R2 R1 +5V V- VCC PFI GND MR PFO TO µP 100kΩ 100kΩ 2N3904 MR PFO +5V 0V +5V 0V VTRIP 0V V- 5 1.25 R1 1.25 VTRIP R2 ,VTRIP 0 – = – < MAX70_ RESET 130kΩ 1% PARAMETER MIN TYP MAX UNIT +12V Reset Threshold at +25°C 10.67 10.87 11.50 V 1MΩ 1% +5V +12V VCC PFI GND MR PFO TO µP MAX70_ BUFFERED RESET TO OTHER SYSTEM COMPONENTS 4.7kΩ VCC GND RESET VCC GND RESET µP MAX705–MAX708/MAX813L MAX705–MAX708/MAX813L Low-Cost, μP Supervisory Circuits www.maximintegrated.com Maxim Integrated │ 8 |
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