________________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.

________________________Applications

µP Voltage Monitoring

Undervoltage Detection

Overvoltage Detection

Battery-Backup Switching

Power-Supply Fault Monitoring

Low-Battery Detection

____________________________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)

_______________Ordering Information

Microprocessor Voltage Monitors

with Programmable Voltage Detection

________________________________________________________________

Maxim Integrated Products

1

V+

HYST

THRESH

MAX8211

OUT

GND

V+

R3

R2

R1

LOGIC-SUPPLY UNDERVOLTAGE DETECTOR

(Detailed Circuit Diagram–Figure 5)

µP

NMI

___________________Pin Configuration

TOP VIEW

V+

MAX8211

MAX8212

N.C.

N.C.

GND

8

7

6

5

2

3

4

N.C.

1

HYST

THRESH

OUT

Pin Configurations continued at end of data sheet.

DIP/SO

___________Typical Operating Circuit

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PART

TEMP. RANGE

PIN-PACKAGE

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

MAX8211ESA

-40°C to +85°C

8 SO

MAX8211EJA

-40°C to +85°C

8 CERDIP

MAX8211MJA

-55°C to +125°C

8 CERDIP

MAX8211MTV

-55°C to +125°C

8 TO-99

MAX8211ETY

-40°C to +85°C

8 TO-99

19-0539; Rev 3; 1/95

Ordering Information continued on last page.

* Contact factory for dice specifications.