MAX8211CPA

Evaluation Kit Available Design Resources Tools and Models Support Click here to ask an associate for production status of specific part numbers. MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection General Description The Maxim’s MAX8211 and MAX8212 are CMOS micropower voltage detectors that warn microprocessors (μPs) of power failures. Each contains a comparator, a 1.15V 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 1.15V internal reference. In the MAX8212, a voltage greater than 1.15V at the threshold pin turns the output stage on (no current limit). Features ● ● ● ● ● ● ● ● ● 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) Ordering Information 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. PART TEMP RANGE 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 Applications 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** ● ● ● ● ● ● μP Voltage Monitoring Undervoltage Detection Overvoltage Detection Battery-Backup Switching Power-Supply Fault Monitoring Low-Battery Detection PIN- PACKAGE Ordering Information continued on last page. *Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883. Pin Configurations Typical Operating Circuit V+ TOP VIEW R3 N.C. 1 HYST 2 THRESH 3 OUT 4 MAX8211 MAX8212 8 V+ 7 N.C. 6 N.C. 5 GND V+ HYST R2 MAX8211 THRESH R1 DIP/SO µP NMI OUT GND LOGIC-SUPPLY UNDERVOLTAGE DETECTOR (DETAILED CIRCUIT DIAGRAM—FIGURE 5) Pin Configurations continued at end of data sheet. 19-0539; Rev 6; 8/20 ©  2020 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2021 Analog Devices, Inc. All rights reserved. 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 .................................................±50mA Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)...727mW 8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C).......640mW 8-Pin TO-99 (derate 6.67mW/°C above +70°C)...........533mW Operating Temperature Ranges MAX821_C_ _.....................................................0°C to +70°C MAX821_E_ _..................................................-40°C to +85°C MAX821_M_ _...............................................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s)...................................+300°C 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 = +25°C, unless otherwise noted.) PARAMETER Supply Current Threshold Trip Voltage Threshold Voltage Disparity between Output and Hysteresis Output SYMBOL I+ VTH VTHP Guaranteed Operating Supply Voltage Range VSUPP Typical Operating Supply Voltage Range VSUPP Threshold Voltage Temperature Coefficient DVTH/DT Variation of Threshold Voltage with Supply Voltage Threshold Input Current Output Leakage Current Output Saturation Voltage www.analog.com DVTH ITH ILOUT VOL CONDITIONS 2V ≤ V+ ≤ 16.5V, GND ≤ VTH ≤ V+ TA = +25°C TA = TMIN to TMAX MAX8211 MIN TA = +25°C TYP MAX 5 15 TA = TMIN to TMAX V+ = 16.5V, IOUT = 4mA V+ = 2V, IOUT = 500µA V+ = 16.5V, IOUT = 3mA V+ = 2.2V, IOUT = 500µA See Figure 4 MIN TYP MAX 5 20 15 20 1.11 1.19 1.11 1.19 1.05 1.25 1.05 1.25 UNITS µA V IOUT = 4mA, IHYST = 1mA TA = +25°C TA = TMIN to TMAX MAX8212 ±0.1 ±0.1 mV 2.0 2.2 16.5 16.5 2.0 2.2 16.5 16.5 V 1.5 16.5 1.5 16.5 V -200 -200 ppm/°C V+ = 4.5V to 5.5V 1.0 0.2 mV 0V ≤ VTH ≤ V+, TA = +25°C TA = TMIN to TMAX 0.01 VOUT = 16.5V, VTH = 1.0V TA = TMIN to V OUT = 16.5V, VTH = 1.3V TMAX, C/E V OUT = 5V, VTH = 1.0V temp. ranges VOUT = 5V, VTH = 1.3V VOUT = 16.5V, VTH = 0.9V TA = TMIN VOUT = 16.5V, VTH = 1.3V to TMAX, M temp. range VOUT = 5V, VTH = 0.9V VOUT = 5V, VTH = 1.3V IOUT = 2mA, VTH = 1.0V IOUT = 2mA, VTH = 1.3V 10 20 0.01 10 20 10 nA 10 1 1 30 µA 30 10 0.17 10 0.4 0.17 0.4 V Analog Devices │  2 MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection Electrical Characteristics (continued) (V+ = 5V, TA = +25°C, unless otherwise noted.) PARAMETER Maximum Available Output Current Hysteresis Leakage Current SYMBOL IOH ILHYS MAX8211 CONDITIONS C temp range, VTH = 1.0V (Note 1) VOUT = 5V VTH = 1.3V (Note 2) MIN TYP 4 7.0 MAX8212 MAX MIN 12 TA = TMIN to TMAX, C/E temp. ranges, V+ = 16.5V, VTH = 1.0V, VHYST = -16.5V with respect to V+ 0.1 TA = TMIN to TMAX, M temp. range, V+ = 16.5V, VTH = 0.9V, VHYST = -16.5V with respect to V+ 3 Hysteresis Saturation Voltage VHYS (MAX) IHYST = 0.5mA, VTH = 1.3V, measured with respect to V+ Maximum Available Hysteresis Current VHYS (MAX) VTH = 1.3V, VHYS = 0V TYP MAX UNITS mA 35 0.1 µA -0.1 2 3 -0.2 10 -0.1 2 -0.2 10 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+ P THRESH N HYST OUT 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 www.analog.com Figure 1. MAX8211 Block Diagram Analog Devices │  3 MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection V+ P THRESH V+ VIN R2 HYST V+ R3 HYST VOUT OUT MAX8211 MAX8212 1.15V REFERENCE THRESH OUT N GND R1 Figure 2. MAX8212 Block Diagram Figure 3. Basic Overvoltage/Undervoltage Circuit less than in the bipolar parts. Higher-value resistors can also be used 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. Applications Information The available current from the HYST output has been increased from 21μA 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. www.analog.com 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 MAX8211 MAX8212 t(on) 40µs 250µs t(off) 1.5ms 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. Analog Devices │  4 MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection MAX8211,8212-FIG 4 1.250 1.230 1.210 VTH (V) 1.190 V+ = 16.5V 1.170 R3 48.7kΩ 1% V+ HYST 1.150 R2 2.2MΩ 1% V+ = 2V 1.130 1.110 1.090 MAX8211 OUT -55 -25 25 75 VOUT (LOW FOR VIN < 4.5V) THRESH GND R1 750kΩ 1% 1.070 1.050 VIN 125 TA (°C) 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: Calculate resistor values for Figure 5 as follows: 1) Choose a value for R1. Typical values are in the 1) Choose a value for R1. Typical values are in the 10kΩ to 10MΩ range. 10kΩ to 10MΩ range. 2) Calculate R2 for the desired upper trip point VU using the formula: V − V TH V − 1.15V R2 = R1× U = R1× U V TH 1.15V 3) Calculate R3 for the desired amount of hysteresis, where VL is the lower trip point: (V + − V TH ) (V + − 1.15V) R3 = R2 × = R2 × (VU − VL ) (VU − VL ) or, if V+ = VIN: (V − V TH ) (V − 1.15V) R3 = R2 × L = R2 × L (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. www.analog.com 2) Calculate R2: (V − V TH ) (V − 1.15V) R2 = R1× L = R1× L V TH 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 generated, even with worst-case threshold trip values and resistor tolerances. R3 provides approximately 75mV of hysteresis. Analog Devices │  5 MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection Pin Configurations (continued) TOP VIEW TOP VIEW HYST THRESH OUT 1 N.C. 2 N.C. 3 MAX8211 MAX8212 GND 4 8 THRESH 7 HYST 6 N.C. 5 V+ OUT 8 1 7 2 N.C. V+ 6 3 4 µMAX 5 N.C. N.C. GND TO-99* * CASE IS CONNECTED TO PIN 7 ON TV PACKAGE. CASE IS CONNECTED TO PIN 4 ON TY PACKAGE. Ordering Information (continued) PART TEMP RANGE PIN- PACKAGE MAX8211MSA/PR -55°C to +125°C 8 SO** MAX8211MSA/PR-T -55°C to +125°C 8 SO** MAX8211MTV -55°C to +125°C 8 TO-99** MAX8212CPA -0°C to +70°C 8 Plastic DIP MAX8212CSA -0°C to +70°C 8 SO 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°C 8 SO 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** MAX8212MSA/PR -55°C to +125°C 8 SO** MAX8212MSA/PR-T -55°C to +125°C 8 SO** MAX8212MTV -55°C to +125°C 8 TO-99** Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 8 CERDIP J8-2 21-0045 8 Plastic DIP P8-1 21-0043 8 SO S8-2 21-0041 8 TO-99 T99-8 21-0022 8 µMAX U8-1 21-0036 *Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883. www.analog.com Analog Devices │  6 MAX8211/MAX8212 Microprocessor Voltage Monitors with Programmable Voltage Detection Revision History REVISION NUMBER REVISION DATE 0 1/91 Initial release 4 9/02 Updated Figure 5 5 9/08 Updated Ordering Information 6 8/20 Updated General Description section DESCRIPTION PAGES CHANGED — 5 1, 6 1 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.Specifications subject to change without notice. No license is granted by implicationor otherwise under any patent or patent rights of Analog Devices. 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