19-0539; Rev 3; 1/95
Microprocessor Voltage Monitors
with Programmable Voltage Detection
________________General Description
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).
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 sev-
eral performance advantages, including reduced supply
current, a more tightly controlled bandgap reference, and
more available current from the hysteresis output.
____________________________Features
o
µP Power-Fail Warning
o
Improved 2nd Source for ICL8211/ICL8212
o
Low-Power CMOS Design
o
5µA Quiescent Current
o
On-Board Hysteresis Output
o
±40mV Threshold Accuracy (±3.5%)
o
2.0V to 16.5V Supply-Voltage Range
o
Define Output Current Limit (MAX8211)
o
High Output Current Capability (MAX8212)
MAX8211/MAX8212
_______________Ordering Information
PART
MAX8211CPA
MAX8211CSA
MAX8211CUA
MAX8211CTY
MAX8211EPA
MAX8211ESA
MAX8211EJA
MAX8211ETY
MAX8211MJA
MAX8211MTV
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 µMAX
8 TO-99
8 Plastic DIP
8 SO
8 CERDIP
8 TO-99
8 CERDIP
8 TO-99
________________________Applications
µP Voltage Monitoring
Undervoltage Detection
Overvoltage Detection
Battery-Backup Switching
Power-Supply Fault Monitoring
Low-Battery Detection
Ordering Information continued on last page.
* Contact factory for dice specifications.
___________________Pin Configuration
TOP VIEW
___________Typical Operating Circuit
V+
R3
V+
N.C.
HYST
THRESH
OUT
1
2
3
4
8
V+
N.C.
N.C.
GND
R1
R2
HYST
OUT
µP
NMI
MAX8211
MAX8212
7
6
5
MAX8211
THRESH
GND
DIP/SO
LOGIC-SUPPLY UNDERVOLTAGE DETECTOR
(Detailed Circuit Diagram–Figure 5)
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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