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________________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

MAX8211/MAX8212

Microprocessor Voltage Monitors

with Programmable Voltage Detection

________________________________________________________________

Maxim Integrated Products

V+

HYST

THRESH

MAX8211

OUT

GND

V+

LOGIC-SUPPLY UNDERVOLTAGE DETECTOR

(DETAILED CIRCUIT DIAGRAM—FIGURE 5)

µP

NMI

_________________Pin Configurations

TOP VIEW

V+

MAX8211

MAX8212

N.C.

GND

N.C.

HYST

THRESH

OUT

DIP/SO

___________Typical Operating Circuit

19-0539; Rev 5; 9/08

Ordering Information continued on last page.

Contact factory for dice specifications.

Contact factory for availability and processing to MIL-STD-883.

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.

Pin Configurations continued at end of data sheet.

PART TEMP RANGE

PIN -

PA C K A G E

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

MAX8211ETY -40°C to +85°C 8 TO-99

MAX8211MJA -55°C to +125°C 8 CERDIP**

Summary of content (7 pages)

PAGE 1
9-0539; 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.
PAGE 2
MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection ABSOLUTE MAXIMUM RATINGS Supply Voltage .......................................................-0.5V to +18V Output Voltage .......................................................-0.5V to +18V Hysteresis...................+0.5V to -18V with respect to (V+ + 0.5V) Threshold Input Voltage ...............................-0.5V to (V+ + 0.5V) Current into Any Terminal .................................................
PAGE 3
Microprocessor Voltage Monitors with Programmable Voltage Detection (V+ = 5V, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL Output Saturation Voltage VOL Maximum Available Output Current IOH Hysteresis Leakage Current MAX8211 MAX8212 UNITS MIN TYP MAX MIN TYP MAX CONDITIONS IOUT = 2mA, VTH = 1.0V 0.17 0.4 IOUT = 2mA, VTH = 1.3V C temp. range, VOUT = 5V 0.17 VTH = 1.0V (Note 1) 4 0.4 7.0 VTH = 1.3V (Note 2) 12 TA = TMIN to TMAX, C/E temp. ranges, V+ = 16.5V, VTH = 1.
PAGE 4
MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection V+ V+ VIN R2 P THRESH V+ R3 HYST HYST OUT VOUT MAX8211 MAX8212 THRESH OUT 1.15V REFERENCE N GND R1 Figure 2. MAX8212 Block Diagram Figure 3. Basic Overvoltage/Undervoltage Circuit in the networks that set up the trip voltage, since the comparator input (THRESH pin) is a low-leakage MOSFET transistor. This further reduces system current drain.
PAGE 5
Microprocessor Voltage Monitors with Programmable Voltage Detection MAX8211/MAX8212 VIN MAX8211,8212-FIG 4 1.250 1.230 1.210 VTH (V) 1.190 R3 48.7kΩ 1% V+ V+ = 16.5V 1.170 HYST 1.150 1.130 MAX8211 R2 2.2MΩ 1% V+ = 2V 1.110 OUT VOUT (LOW FOR VIN < 4.5V) THRESH 1.090 GND R1 750kΩ 1% 1.070 1.050 -55 -25 25 75 125 TA (°C) Figure 4. MAX8211/MAX8212 Threshold Trip Voltage vs. Ambient Temperature Figure 5.
PAGE 6
MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection _____________________________________________Pin Configurations (continued) TOP VIEW TOP VIEW HYST 7 1 OUT 1 8 THRESH N.C. 2 7 HYST 6 N.C. 5 V+ N.C. 3 GND 4 MAX8211 MAX8212 OUT V+ 8 THRESH 6 2 3 N.C. 5 4 N.C. N.C. GND µMAX TO-99* * CASE IS CONNECTED TO PIN 7 ON TV PACKAGE. CASE IS CONNECTED TO PIN 4 ON TY PACKAGE.
PAGE 7
Microprocessor Voltage Monitors with Programmable Voltage Detection REVISION NUMBER REVISION DATE 0 1/91 Initial release 4 9/02 Updated Figure 5. 5 9/08 Updated Ordering Information. DESCRIPTION PAGES CHANGED — 5 1, 6 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.