MAX6301 Maxim Integrated Products, MAX6301 Datasheet
MAX6301
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MAX6301 Summary of contents
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... A watchdog select pin extends the watchdog timeout period to 500x. The reset function features immunity to power-supply transients. These four devices differ only in the structure of their reset outputs (see Selector Guide ). The MAX6301–MAX6304 are available in the space-saving 8-pin µMAX package, as well as 8-pin DIP/SO. ________________________Applications ...
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... Low-Power µP Supervisory Circuits with Adjustable Reset/Watchdog ABSOLUTE MAXIMUM RATINGS V .......................................................................-0.3V to +7.0V CC RESET IN, SWT, SRT ..................................-0. WDI, WDS..............................................................-0.3V to +7.0V RESET, RESET MAX6301 ...........................................................-0.3V to +7.0V MAX6302/6303/6304 ..............................-0. Input Current V ...............................................................................±20mA CC GND..............................................................................±20mA Output Current RESET, RESET..............................................................±20mA Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied ...
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Low-Power µP Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued +2V to +5.5V MIN MAX PARAMETER SYMBOL WATCHDOG TIMER V WDI, WDS Input Threshold V WDI Pulse Width t WDI, WDS Leakage Current ...
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Low-Power µP Supervisory Circuits with Adjustable Reset/Watchdog ____________________________Typical Operating Characteristics (continued 1500pF +25°C, unless otherwise noted.) SWT SRT A SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.2 RESET DEASSERTED 4.0 NO LOAD 3.8 3.6 3.4 ...
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... WDI or WDS. The watchdog timer is cleared when reset is asserted and restarted after reset deasserts. In the extended watchdog mode (WDS = V driving WDI with a three-stated driver or by leaving WDI unconnected. Open-Drain, Active-Low Reset Output (MAX6301) RESET (MAX6301/3) Push/Pull, Active-Low Reset Output (MAX6303) ...
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... Reset Function/Output The reset output is typically connected to the reset input of a microprocessor (µP). A µP’s reset input starts or restarts the µ known state. The MAX6301– MAX6304 µP supervisory circuits provide the reset logic to prevent code-execution errors during power- up, power-down, and brownout conditions (see Typical Operating Circuit ) ...
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... WDI. WDI is a high-impedance input in this mode. Do not leave WDI unconnected in normal mode. _______________________________________________________________________________________ with Adjustable Reset/Watchdog 500 When WDI SRT Figure 3. Calculating the Reset ( Timeout Capacitor Values SWT GND CC MAX6301 SRT MAX6302 MAX6303 SWT MAX6304 C SWT RST SWT 2.67 2. RST SWT t in µ ...
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... In some applications advantageous to put a µP into sleep mode, periodically “wake it up” to perform checks and/or tasks, then put it back into sleep mode. The MAX6301 family supervisors can easily accommo- date this technique. Figure 5 illustrates an example using the MAX6302 and an 80C51. In Figure 5, just before the µC puts itself into sleep mode, it pulls WDS high. The µ ...
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... Figure 6. Adding a Manual Reset Function Interfacing to µPs with Bidirectional Reset Pins Since RESET is open-drain, the MAX6301 interfaces easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11 (Figure 7). Connecting RESET directly to the µP’s reset pin with a single pull-up allows either device to assert reset ...
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Low-Power µP Supervisory Circuits with Adjustable Reset/Watchdog V MAX6303 V CC RESET GND Figure 9. Ensuring RESET Valid Ensuring a Valid RESET /RESET Output Down (MAX6303/MAX6304) CC falls below 1V, ...
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Low-Power µP Supervisory Circuits _____________Layout Considerations SRT and SWT are precision current sources. When developing the layout for the application, be careful to minimize board capacitance and leakage currents around these pins. Traces connected to these pins should be ...
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... Maxim reserves the right to change the circuitry and specifications without notice at any time. implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © ...