MAX8212 Maxim Integrated Products, MAX8212 Datasheet

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MAX8212

Manufacturer Part Number
MAX8212
Description
Manufacturer
Maxim Integrated Products
Datasheet

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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
___________________Pin Configuration
19-0539; Rev 3; 1/95
________________General Description
Call toll free 1-800-998-8800 for free samples or literature.
Pin Configurations continued at end of data sheet.
TOP VIEW
µP Voltage Monitoring
Undervoltage Detection
Overvoltage Detection
Battery-Backup Switching
Power-Supply Fault Monitoring
Low-Battery Detection
THRESH
HYST
N.C.
OUT
4
1
2
3
________________________________________________________________ Maxim Integrated Products
with Programmable Voltage Detection
MAX8211
MAX8212
DIP/SO
Microprocessor Voltage Monitors
8
5
7
6
N.C.
GND
N.C.
V+
____________________________Features
___________Typical Operating Circuit
_______________Ordering Information
Ordering Information continued on last page.
* Contact factory for dice specifications.
MAX8211CPA
MAX8211CSA
MAX8211CUA
MAX8211CTY
MAX8211EPA
MAX8211ESA
MAX8211EJA
MAX8211ETY
MAX8211MJA
MAX8211MTV
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)
PART
LOGIC-SUPPLY UNDERVOLTAGE DETECTOR
R3
R2
R1
(Detailed Circuit Diagram–Figure 5)
HYST
THRESH
-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
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX8211
V+
V+
GND
OUT
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
PIN-PACKAGE
NMI
P
1

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MAX8212 Summary of contents

Page 1

... 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). ...

Page 2

... OUT 16.5V 0.9V OUT 16.5V 1. OUT TH MIN MAX 0.9V OUT 5V 1.3V OUT TH MAX8211 MAX8212 UNITS MIN TYP MAX MIN TYP MAX µ 1.11 1.19 1.11 1.19 V 1.05 1.25 1.05 1.25 ±0.1 ±0.1 mV 2.0 16.5 2.0 16.5 V 2.2 16.5 2.2 16.5 1 ...

Page 3

... Note 2: The maximum output current of the MAX8212 is not defined, and systems using the MAX8212 must therefore ensure that the output current does not exceed 50mA and that the maximum power dissipation of the device is not exceeded. ...

Page 4

... Voltage Detectors with Hysteresis To ensure noise-free output switching, hysteresis is frequently used in voltage detectors. For both the MAX8211 and MAX8212 the HYST output is on for threshold voltages greater than 1.15V. R3 (Figure 3) controls the amount of current (positive feedback) sup- plied from the HYST output to the mid-point of the resis- tor divider, and hence the magnitude of the hysteresis, or dead-band ...

Page 5

... T (°C) A Figure 4. MAX8211/MAX8212 Threshold Trip Voltage vs. Ambient Temperature Calculate resistor values for Figure 3 as follows: 1) Choose a value for R1. Typical values are in the 10k to 10M range. 2) Calculate R2 for the desired upper trip point V using the formula 1.15V) ...

Page 6

... MAX8212CUA 0°C to +70°C 8 µMAX MAX8212CTY 0°C to +70°C 8 TO-99 MAX8212EPA -40°C to +85°C 8 Plastic DIP MAX8212ESA -40°C to +85° MAX8212EJA -40°C to +85°C 8 CERDIP MAX8212ETY -40°C to +85°C 8 TO-99 MAX8212MJA -55°C to +125°C 8 CERDIP MAX8212MTV -55°C to +125°C 8 TO-99 * Contact factory for dice specifications. ...

Page 7

Microprocessor Voltage Monitors with Programmable Voltage Detection ________________________________________________________Package Information A 0.101mm 0.004 _______________________________________________________________________________________ C L 8-PIN MAX MICROMAX SMALL OUTLINE PACKAGE 0°-8° 0.101mm 0.004in ...

Page 8

... 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. 8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1995 Maxim Integrated Products ...

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