19-0539; Rev 5; 9/08
Microprocessor Voltage Monitors
with Programmable Voltage Detection
____________________________Features
Maxim’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).
o µP Power-Fail Warning
o Improved 2nd Source for ICL8211/ICL8212
o Low-Power CMOS Design
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.
o
o
o
o
o
o
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)
_______________Ordering Information
TEMP RANGE
PINPACKAGE
MAX8211CPA
-0°C to +70°C
8 Plastic DIP
MAX8211CSA
-0°C to +70°C
8 SO
MAX8211CUA
-0°C to +70°C
8 µMAX
MAX8211CTY
-0°C to +70°C
8 TO-99
MAX8211EPA
-40°C to +85°C
8 Plastic DIP
µP Voltage Monitoring
MAX8211ESA
-40°C to +85°C
8 SO
Undervoltage Detection
MAX8211EJA
-40°C to +85°C
8 CERDIP
MAX8211ETY
-40°C to +85°C
8 TO-99
MAX8211MJA
-55°C to +125°C
8 CERDIP**
________________________Applications
Overvoltage Detection
Battery-Backup Switching
PART
Ordering Information continued on last page.
*Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
Power-Supply Fault Monitoring
Low-Battery Detection
_________________Pin Configurations
___________Typical Operating Circuit
V+
TOP VIEW
R3
V+
N.C.
1
HYST
2
THRESH
3
OUT
4
8
7
N.C.
6
N.C.
5
MAX8211
MAX8212
V+
GND
HYST
OUT
R2
µP
NMI
MAX8211
THRESH
GND
R1
DIP/SO
Pin Configurations continued at end of data sheet.
LOGIC-SUPPLY UNDERVOLTAGE DETECTOR
(DETAILED CIRCUIT DIAGRAM—FIGURE 5)
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX8211/MAX8212
________________General Description
