Microprocessor Voltage Monitors with Programmable Voltage Detection
DescriptionMaxim's MAX8211 and MAX8212 are CMOS micropower voltage detectors that warn microprocessors (µPs) of power failures. Each contains a comparator, a 1.5V bandgap reference, and an open-drain n-channel output driver. Two external resistors are used in conjunction with the internal reference to set the trip voltage to the desired level. A hysteresis output is also included, allowing the user to apply positive feedback for noise-free output switching.
The MAX8211 provides a 7mA current-limited output sink whenever the voltage applied to the threshold pin is less than the 1.5V internal reference. In the MAX8212, a voltage greater than 1.5V at the threshold pin turns the output stage on (no current limit).
The CMOS MAX8211/MAX8212 are plug-in replacements for the bipolar ICL8211/ICL8212 in applications where the maximum supply voltage is less than 16.5V. They offer several performance advantages, including reduced supply current, a more tightly controlled bandgap reference, and more available current from the hysteresis output.
- µP Power-Fail Warning
- Improved 2nd Source for ICL8211/ICL8212
- Low-Power CMOS Design
- 5µA Quiescent Current
- On-Board Hysteresis Output
- ±40mV Threshold Accuracy (±3.5%)
- 2.0V to 16.5V Supply-Voltage Range
- Define Output Current Limit (MAX8211)
- High Output Current Capability (MAX8212)
- µP Voltage Monitoring
- Battery-Backup Switching
- Low-Battery Detection
- Overvoltage Detection
- Power-Supply Fault Monitoring
- Undervoltage Detection
|Part Number||Reset Thresh.|
|Reset Out||tRESET||Watchdog Feature||Supervisor Features||Reset Thresh. Accur.|
|(min)||(@ +25°C)||(max)||(See Notes)|
|<1ms||No Watchdog||High Voltage (>6V)||3||15|
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|