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MAX823TEUK Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MAX823TEUK Datasheet(HTML) 11 Page - Micrel Semiconductor |
11 / 14 page Micrel, Inc. MAX823/4/5 January 14, 2014 11 Revision 1.0 Watchdog Input The MAX823/4 has an on-chip watchdog timer that can reset the microprocessor if it fails to strobe the WDI input within a preset timeout period (tWD). If the WDI pin is left unconnected, this function is disabled. The watchdog timeout period starts when the reset outputs are deasserted or either a high-to-low or low-to-high transition occurs before the watchdog timeout period (tWD). If the watchdog timer times out, then the reset outputs will assert and stay asserted for a reset timeout period (tRP). The watchdog timer is also cleared whenever the reset outputs are asserted by /MR, or if VCC falls below VRST. The watchdog timer starts again whenever the reset outputs are de-asserted. Figure 3. Watchdog Input Watchdog Input Current The WDI input current is the current sourced or sinked by the WDI pin when the WDI input is driven low or high, respectively. The WDI input is designed to drive a tri- state output device with a 10µA maximum leakage current and a maximum capacitance of 200pF. VCC Transient The MAX823/4/5 is relatively immune to small negative- going VCC glitches below the reset threshold. As shown in Figure 4, the overdrive voltage is the difference between the threshold voltage and the minimum point of the VCC glitch. Typically, an overdrive of 100mV with duration of 2 μs or less will not cause a reset. Figure 4. VCC Transient Reset Valid up to VCC = 1V The MAX823/4/5 is a supervisory circuit that monitors the power supply voltage level. If the power supply voltage level falls below the factory-programmed threshold level, then the reset signals are asserted. The MAX823/4/5 maintains the reset states with VCC as low as 1V. Supply Bypass Capacitor An optional 0.1µF input bypass capacitor can be placed from VCC (Pin 6) to GND (Pin 2) to increase glitch rejection and provides additional transient immunity. |
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