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19-0539; Rev 5; 9/08
Microprocessor Voltage Monitors with Programmable Voltage Detection MAX8211/MAX8212
________________General Description
Maxim's MAX8211 and MAX8212 are CMOS micropower voltage detectors that warn microprocessors (Ps) 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 several performance advantages, including reduced supply current, a more tightly controlled bandgap reference, and more available current from the hysteresis output.
____________________________Features
o P Power-Fail Warning o Improved 2nd Source for ICL8211/ICL8212 o Low-Power CMOS Design o o o o o o 5A 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)
_______________Ordering Information
PART MAX8211CPA MAX8211CSA MAX8211CUA MAX8211CTY MAX8211EPA MAX8211ESA MAX8211EJA MAX8211ETY MAX8211MJA TEMP RANGE -0C to +70C -0C to +70C -0C to +70C -0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -55C to +125C PINPACKAGE 8 Plastic DIP 8 SO 8 MAX 8 TO-99 8 Plastic DIP 8 SO 8 CERDIP 8 TO-99 8 CERDIP**
________________________Applications
P 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. **Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
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 P 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
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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.
Microprocessor Voltage Monitors with Programmable Voltage Detection MAX8211/MAX8212
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 .................................................50mA Continuous Power Dissipation (TA = +70C) 8-Pin Plastic DIP (derate 9.09mW/C above +70C) .....727mW 8-Pin SO (derate 5.88mW/C above +70C)..................471mW 8-Pin CERDIP (derate 8.00mW/C above +70C)..........640mW 8-Pin TO-99 (derate 6.67mW/C above +70C).............533mW Operating Temperature Ranges MAX821_C_ _ .......................................................0C to +70C MAX821_E_ _.....................................................-40C to +85C MAX821_M_ _ ..................................................-55C to +125C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 5V, TA = +25C, unless otherwise noted.) PARAMETER Supply Current SYMBOL I+ CONDITIONS 2V V+ 16.5V, GND VTH V+ TA = +25C Threshold Trip Voltage VTH TA = TMIN to TMAX Threshold Voltage Disparity between Output and Hysteresis Output Guaranteed Operating Supply Voltage Range Typical Operating Supply Voltage Range Threshold Voltage Temperature Coefficient Variation of Threshold Voltage with Supply Voltage Threshold Input Current IOUT = 4mA, IHYST = 1mA TA = +25C TA = TMIN to TMAX 2.0 2.2 1.5 -200 1.0 0.01 10 20 VOUT = 16.5V, VTH = 1.0V TA = TMIN to TMAX, VOUT = 16.5V, VTH = 1.3V C/E temp. ranges VOUT = 5V, VTH = 1.0V Output Leakage Current ILOUT VOUT = 5V, VTH = 1.3V VOUT = 16.5V, VTH = 0.9V TA = TMIN to TMAX, VOUT = 16.5V, VTH = 1.3V M temp. range VOUT = 5V, VTH = 0.9V VOUT = 5V, VTH = 1.3V 30 10 10 10 1 1 30 A TA = +25C TA = TMIN to TMAX V+ = 16.5V, IOUT = 4mA V+ = 2V, IOUT = 500A V+ = 16.5V, IOUT = 3mA V+ = 2.2V, IOUT = 500A 1.11 1.05 MAX8211 MAX8212 UNITS MIN TYP MAX MIN TYP MAX 5 15 20 1.19 1.11 1.25 1.05 5 15 20 1.19 V 1.25 A
VTHP
0.1 16.5 16.5 16.5 2.0 2.2 1.5
0.1 16.5 16.5 16.5 -200 0.2 0.01 10 20 10
mV
VSUPP VSUPP
V V ppm/C mV nA
VTH/T See Figure 4 VTH ITH V+ = 4.5V to 5.5V 0V VTH V+, TA = +25C TA = TMIN to TMAX
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Microprocessor Voltage Monitors with Programmable Voltage Detection MAX8211/MAX8212
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, TA = +25C, unless otherwise noted.) PARAMETER Output Saturation Voltage Maximum Available Output Current SYMBOL VOL IOH CONDITIONS IOUT = 2mA, VTH = 1.0V IOUT = 2mA, VTH = 1.3V C temp. range, VOUT = 5V VTH = 1.0V (Note 1) VTH = 1.3V (Note 2) 0.1 4 7.0 12 35 0.1 A TA = TMIN to TMAX, M temp. range, V+ = 16.5V, VTH = 0.9V, VHYST = -16.5V with respect to V+ VHYS (MAX) VHYS (MAX) IHYST = 0.5mA, VTH = 1.3V, measured with respect to V+ VTH = 1.3V, VHYS = 0V 2 -0.1 10 3 3 MAX8211 MAX8212 UNITS MIN TYP MAX MIN TYP MAX 0.17 0.4 0.17 0.4 V mA
Hysteresis Leakage Current
TA = TMIN to TMAX, C/E temp. ranges, V+ = 16.5V, VTH = 1.0V, VHYST = -16.5V with respect to V+ ILHYS
Hysteresis Saturation Voltage Maximum Available Hysteresis Current
-0.2 2
-0.1 10
-0.2
V mA
Note 1: The maximum output current of the MAX8211 is limited by design to 30mA under any operating condition. The output voltage may be sustained at any voltage up to +16.5V as long as the maximum power dissipation of the device is not exceeded. 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.
_______________Detailed Description
As shown in the block diagrams of Figures 1 and 2, the MAX8211 and MAX8212 each contain a 1.15V reference, a comparator, an open-drain n-channel output transistor, and an open-drain p-channel hysteresis output. The MAX8211 output n-channel turns on when the voltage applied to the THRESH pin is less than the internal reference (1.15V). The sink current is limited to 7mA (typical), allowing direct drive of an LED without a series resistor. The MAX8212 output turns on when the voltage applied to THRESH is greater than the internal reference. It is not current limited, and will typically sink 35mA.
V+
THRESH
P HYST
OUT N 1.15V REFERENCE
Compatibility with ICL8211/ICL8212
The CMOS MAX8211/MAX8212 are plug-in replacements for the bipolar ICL8211/ICL8212 in most applications. The use of CMOS technology has several advantages. The quiescent supply current is much less than in the bipolar parts. Higher-value resistors can also be used
Figure 1. MAX8211 Block Diagram
________________________________________________________________________________________
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Microprocessor Voltage Monitors with Programmable Voltage Detection MAX8211/MAX8212
V+ VIN R2 THRESH P HYST R3 HYST V+
V+ OUT VOUT
MAX8211 MAX8212
THRESH OUT 1.15V REFERENCE N R1 GND
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. The tolerance of the internal reference has also been significantly improved, allowing for more precise voltage detection without the use of potentiometers. The available current from the HYST output has been increased from 21A to 10mA, making the hysteresis feature easier to use. The disparity between the HYST output and the voltage required at THRESH to switch the OUT pin has also been reduced in the MAX8211 from 8mV to 0.1mV to eliminate output "chatter" or oscillation. Most voltage detection circuits operate with supplies of 15V or less; in these applications, the MAX8211/ MAX8212 will replace ICL8211/ICL8212s with the performance advantages described above. However, note that the CMOS parts have an absolute maximum supply-voltage rating of 18V, and should never be used in applications where this rating could be exceeded. Exercise caution when replacing ICL8211/ICL8212s in closed-loop applications such as programmable zeners. Although neither the ICL8211/ICL8212 nor the MAX8211/MAX8212 are internally compensated, the CMOS parts have higher gain and may not be stable for the external compensation-capacitor values used in lower-gain ICL8211/ICL8212 circuits.
__________Applications Information
Basic Voltage Detectors
Figure 3 shows the basic circuit for both undervoltage detection (MAX8211) and overvoltage detection (MAX8212). For applications where no hysteresis is needed, R3 should be omitted. The ratio of R1 to R2 is then chosen such that, for the desired trip voltage at VIN, 1.15V is applied to the THRESH pin. Since the comparator inputs are very low-leakage MOSFET transistors, the MAX8211/MAX8212 can use much higher resistors values in the attenuator network than can the bipolar ICL8211/ICL8212. See Table 1 for switching delays.
Table 1. Switching Delays
TYPICAL DELAYS t(on) t(off) MAX8211 40s 1.5ms MAX8212 250s 3ms
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) supplied from the HYST output to the mid-point of the resistor divider, and hence the magnitude of the hysteresis, or dead-band.
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________________________________________________________________________________________
Microprocessor Voltage Monitors with Programmable Voltage Detection MAX8211/MAX8212
VIN 1.230 1.210 1.190 VTH (V) 1.170 1.150 1.130 1.110 1.090 1.070 1.050 -55 -25 25 TA (C) 75 125 V+ = 2V V+ = 16.5V R2 2.2M 1% THRESH R1 750k 1% GND
MAX8211,8212-FIG 4
1.250
R3 48.7k 1% HYST
V+
MAX8211
OUT VOUT (LOW FOR VIN < 4.5V)
Figure 4. MAX8211/MAX8212 Threshold Trip Voltage vs. Ambient Temperature
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 10k to 10M range. 2) Calculate R2 for the desired upper trip point VU using the formula:
(VU - VTH ) (VU - 1.15V) R2 = R1 x = R1 x VTH 1.15V
Calculate resistor values for Figure 5 as follows: 1) Choose a value for R1. Typical values are in the 10k to 10M range. 2) Calculate R2:
R2 = R1 x (VL - VTH ) (VL - 1.15V) = R1 x VTH 1.15V
3) Calculate R3:
R3 = R1 x (VU - VL ) 1.15V
3) Calculate R3 for the desired amount of hysteresis, where VL is the lower trip point:
R3 = R2 x (V + - VTH ) (V + - 1.15V) = R2 x (VU - VL ) (VU - VL )
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 generated, even with worst-case threshold trip values and resistor tolerances. R3 provides approximately 75mV of hysteresis.
or, if V+ = VIN:
R3 = R2 x (VL - VTH ) (VL - 1.15V) = R2 x (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.
________________________________________________________________________________________
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Microprocessor Voltage Monitors with Programmable Voltage Detection MAX8211/MAX8212
_____________________________________________Pin Configurations (continued)
TOP VIEW TOP VIEW HYST THRESH 1
OUT 1 N.C. 2 N.C. 3 GND 4 8 THRESH HYST N.C. V+
8 7
V+ 6 N.C.
OUT
2 3 5 4 GND TO-99*
MAX8211 MAX8212 MAX
7 6 5
N.C.
N.C.
* CASE IS CONNECTED TO PIN 7 ON TV PACKAGE. CASE IS CONNECTED TO PIN 4 ON TY PACKAGE.
_Ordering Information (continued)
PART MAX8211MSA/PR MAX8211MSA/PR-T MAX8211MTV MAX8212CPA MAX8212CSA MAX8212CUA MAX8212CTY MAX8212EPA MAX8212ESA MAX8212EJA MAX8212ETY MAX8212MJA MAX8212MSA/PR MAX8212MSA/PR-T MAX8212MTV TEMP RANGE -55C to +125C -55C to +125C -55C to +125C -0C to +70C -0C to +70C -0C to +70C -0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -55C to +125C -55C to +125C -55C to +125C -55C to +125C PINPACKAGE 8 SO** 8 SO** 8 TO-99** 8 Plastic DIP 8 SO 8 MAX 8 TO-99 8 Plastic DIP 8 SO 8 CERDIP 8 TO-99 8 CERDIP** 8 SO** 8 SO** 8 TO-99**
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 8 CERDIP 8 Plastic DIP 8 SO 8 TO-99 8 MAX PACKAGE CODE J8-2 P8-1 S8-2 T99-8 U8-1 DOCUMENT NO. 21-0045 21-0043 21-0041 21-0022 21-0036
*Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883.
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Microprocessor Voltage Monitors with Programmable Voltage Detection
Revision History
REVISION NUMBER 0 4 5 REVISION DATE 1/91 9/02 9/08 Initial release Updated Figure 5. Updated Ordering Information. DESCRIPTION PAGES CHANGED -- 5 1, 6
MAX8211/MAX8212
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.
7 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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