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MAX6753KA-T Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX6753KA-T Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 14 page Applications Information Selecting Reset/Watchdog Timeout Capacitor The reset timeout period is adjustable to accommodate a variety of µP applications. Adjust the reset timeout period (tRP) by connecting a capacitor (CSRT) between SRT and ground. Calculate the reset timeout capacitor as folllows: CSRT = tRP / (5.06 x 106), with tRP in seconds and CSRT in Farads. The watchdog timeout period is adjustable to accom- modate a variety of µP applications. With this feature, the watchdog timeout can be optimized for software execution. The programmer can determine how often the watchdog timer should be serviced. Adjust the watchdog timeout period (tWD) by connecting a specif- ic value capacitor (CSWT) between SWT and GND. For normal mode operation, calculate the watchdog time- out capacitor as follows: CSWT = tWD/(5.06 x 106), with tRP in seconds and CSRT in Farads. For the MAX6752 and MAX6753 windowed watchdog function, calculate the slow watchdog period, tWD2 as follows: tWD2 = 0.65 x 109 x CSWT CSRT and CSWT must be a low-leakage (< 10nA) type capacitor. Ceramic capacitors are recommended. Transient Immunity In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, these supervi- sors are relatively immune to short-duration supply tran- sients (glitches). The Maximum Transient Duration vs. Reset Threshold Overdrive graph in the Typical Operating Characteristics shows this relationship. The area below the curves of the graph is the region in which these devices typically do not generate a reset pulse. This graph was generated using a falling pulse applied to VCC , starting above the actual reset threshold (VTH) and ending below it by the magnitude indicated (reset-threshold overdrive). As the magnitude of the tran- sient increases (farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 50µs or less does not cause a reset pulse to be issued. µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay 10 ______________________________________________________________________________________ MAX6747 MAX6749 MAX6451 MAX6753 GND N RESET RESET 5V VCC VCC GND 3.3V µP 100k Ω Figure 6. Interfacing to Other Voltage Levels WDI (a) FAST FAULT (b) SLOW FAULT WDI RESET (c) NORMAL OPERATION (NO PULSING, OUTPUT STAYS HIGH) RESET WDI RESET tWDI < tWD1 (MIN) tWDI > tWD2 (MAX) tWD1 (MAX) < tWDI < tWD2 (MIN) Figure 5. MAX6752/MAX6753 Window Watchdog Diagram |
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