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MAX16057ATT__+T Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX16057ATT__+T Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page Interfacing to Other Voltages for Logic Compatibility The open-drain RESET output can be used to interface to a µP with other logic levels. The open-drain output is connected to a voltage from 0V to 5.5V as shown in Figure 5. Generally, the pullup resistor connected to RESET connects to the supply voltage that is being monitored at the device’s VCC input. However, some systems use the open-drain output to level-shift from the supervisor’s monitored supply to another supply voltage. As the supervisor’s VCC decreases, so does the device’s ability to sink current at RESET. Ensuring a Valid RESET Down to VCC = 0V (Push-Pull RESET) When VCC falls below 1.1V, the current-sinking capabil- ity of RESET decreases drastically. The high-imped- ance CMOS logic inputs connected to RESET can drift to undetermined voltages. This presents no problems in most applications, since most µPs and other circuitry do not operate with VCC below 1.1V. In those applica- tions where RESET must be valid down to 0, add a pull- down resistor between the MAX16056/MAX16057 push-pull RESET output and GND. The resistor sinks any stray leakage currents, holding RESET low (Figure 6). Choose a pulldown resistor that accommodates leakages, such that RESET is not significantly loaded and is capable of pulling to GND. The external pull- down cannot be used with the open-drain RESET out- put of the MAX16058/MAX16059. 125nA Supervisory Circuits with Capacitor- Adjustable Reset and Watchdog Timeouts ______________________________________________________________________________________ 11 Figure 5. Interfacing with Other Voltage Levels 5V GND µP RESET 100k Ω 3.3V MAX16058 MAX16059 VCC VCC GND RESET Figure 6. Ensuring RESET Valid to VCC = GND VCC VCC GND RESET 2M Ω MAX16056 MAX16057 |
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