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PDF MAX8211MTV Data sheet ( Hoja de datos )
| Número de pieza | MAX8211MTV | |
| Descripción | Microprocessor Voltage Monitors with Programmable Voltage Detection | |
| Fabricantes | Maxim Integrated | |
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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.
________________________Applications
µP Voltage Monitoring
Undervoltage Detection
Overvoltage Detection
Battery-Backup Switching
Power-Supply Fault Monitoring
Low-Battery Detection
___________________Pin Configuration
____________________________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
PART
TEMP. RANGE PIN-PACKAGE
MAX8211CPA
0°C to +70°C
8 Plastic DIP
MAX8211CSA
0°C to +70°C
8 SO
MAX8211CUA
MAX8211CTY
0°C to +70°C
0°C to +70°C
8 µMAX
8 TO-99
MAX8211EPA
-40°C to +85°C
8 Plastic DIP
MAX8211ESA
-40°C to +85°C
8 SO
MAX8211EJA
MAX8211ETY
MAX8211MJA
MAX8211MTV
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
8 CERDIP
8 TO-99
8 CERDIP
8 TO-99
Ordering Information continued on last page.
* Contact factory for dice specifications.
___________Typical Operating Circuit
TOP VIEW
V+
N.C. 1
HYST 2
THRESH 3
OUT 4
MAX8211
MAX8212
8 V+
7 N.C.
6 N.C.
5 GND
R3
V+
HYST
OUT
R2
MAX8211
THRESH
GND
R1
µP
NMI
DIP/SO
Pin Configurations continued at end of data sheet.
LOGIC-SUPPLY UNDERVOLTAGE DETECTOR
(Detailed Circuit Diagram–Figure 5)
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
1 page  
Microprocessor Voltage Monitors
with Programmable Voltage Detection
1.250
1.230
1.210
1.190
1.170
1.150
1.130
1.110
1.090
1.070
1.050
-55
V+ = 16.5V
V+ = 2V
-25 25
TA (°C)
75
125
Figure 4. MAX8211/MAX8212 Threshold Trip Voltage vs.
Ambient Temperature
R3
48.7k
1%
R2
20M
1%
R1
750k
1%
VIN
V+
HYST MAX8211
OUT
THRESH
GND
VOUT
(LOW FOR
VIN < 4.5V)
Figure 5. MAX8211 Logic-Supply Low-Voltage Detector
Calculate resistor values for Figure 3 as follows:
1) Choose a value for R1. Typical values are in
the 10kΩ to 10MΩ range.
2) Calculate R2 for the desired upper trip point
VU using the formula:
R2 = R1 × (VU − VTH) = R1 × (VU − 1.15V)
VTH 1.15V
3) Calculate R3 for the desired amount of
hysteresis, where VL is the lower trip point:
R3 = R2 × (V + − VTH) = R2 × (V + − 1.15V)
(VU − VL)
(VU − VL)
or, if V+ = VIN:
R3 = R2 × (VL − VTH) = R2 × (VL − 1.15V)
(VU − VL)
(VU − VL)
Figure 5 shows an alternate circuit, suitable only when the
voltage being detected is also the power-supply voltage
for the MAX8211 or MAX8212.
Calculate resistor values for Figure 5 as follows:
1) Choose a value for R1. Typical values are in
the 10kΩ to 10MΩ range.
2) Calculate R2:
R2 = R1 × (VL − VTH) = R1 × (VL − 1.15V)
VTH 1.15V
3) Calculate R3:
R3 = R1 × (VU − VL)
1.15V
Low-Voltage Detector for Logic Supply
The circuit of Figure 5 will detect when a 5.0V (nominal)
supply goes below 4.5V, which is the VMIN normally
specified in logic systems. The selected resistor values
ensure that false undervoltage alarms will not be gener-
ated, even with worst-case threshold trip values and
resistor tolerances. R3 provides approximately 75mV of
hysteresis.
________________________________________________________________________________________ 5
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