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Part Number ICL7665AESA+T
Manufacturer Maxim Integrated
Datasheet ICL7665AESA+T Datasheet
Package 8-SOIC (0.154", 3.90mm Width)
In Stock 355 piece(s)
Unit Price $ 2.9866 *
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Part Number # ICL7665AESA+T (PMIC - Supervisors) is manufactured by Maxim Integrated and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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ICL7665AESA+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Supervisors
Datasheet ICL7665AESA+TDatasheet
Package8-SOIC (0.154", 3.90mm Width)
TypeMulti-Voltage Supervisor
Number of Voltages Monitored2
OutputOpen Drain or Open Collector
ResetActive High
Reset Timeout<1 ms Minimum
Voltage - ThresholdAdjustable/Selectable
Operating Temperature-40°C ~ 85°C (TA)
Mounting TypeSurface Mount
Package / Case8-SOIC (0.154", 3.90mm Width)
Supplier Device Package8-SOIC

ICL7665AESA+T Datasheet

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_______________General Description The ICL7665 warns microprocessors (µPs) of overvolt- age and undervoltage conditions. It draws a typical operating current of only 3µA. The trip points and hys- teresis of the two voltage detectors are individually pro- grammed via external resistors to any voltage greater than 1.3V. The ICL7665 will operate from any supply voltage in the 1.6V to 16V range, while monitoring volt- ages from 1.3V to several hundred volts. The Maxim ICL7665A is an improved version with a 2%-accurate VSET1 threshold and guaranteed performance over temperature. The 3µA quiescent current of the ICL7665 makes it ideal for voltage monitoring in battery-powered sys- tems. In both battery- and line-powered systems, the unique combination of a reference, two comparators, and hysteresis outputs reduces the size and compo- nent count of many circuits. ________________________Applications µP Voltage Monitoring Low-Battery Detection Power-Fail and Brownout Detection Battery Backup Switching Power-Supply Fault Monitoring Over/Undervoltage Protection High/Low Temperature, Pressure, Voltage Alarms ____________________________Features µP Over/Undervoltage Warning Improved Second Source Dual Comparator with Precision Internal Reference 3µA Operating Current 2% Threshold Accuracy (ICL7665A) 1.6V to 16V Supply Voltage Range On-Board Hysteresis Outputs Externally Programmable Trip Points Monolithic, Low-Power CMOS Design ______________Ordering Information Ordering Information continued on last page. IC L 7 6 6 5 Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection ________________________________________________________________ Maxim Integrated Products 1 1 + 2 3 4 8 7 6 5 OUT2 SET2 HYST2GND SET1 HYST1 OUT1 ICL7665 DIP/SO TOP VIEW V+ _________________Pin Configurations ICL7665 OUT1 OUT2 SET2SET1 V+ VIN2VIN1 V+ 8 4 1 7 63 GND OVERVOLTAGE DETECTION UNDERVOLTAGE DETECTION SIMPLE THRESHOLD DETECTOR NMI __________Typical Operating Circuit 19-0001; Rev 3; 11/15 PART TEMP. RANGE PIN-PACKAGE ICL7665CPA 0°C to +70°C 8 Plastic DIP ICL7665ACPA 0°C to +70°C 8 Plastic DIP ICL7665BCPA 0°C to +70°C 8 Plastic DIP ICL7665CSA 0°C to +70°C 8 SO ICL7665ACSA 0°C to +70°C 8 SO ICL7665BCSA 0°C to +70°C 8 SO ICL7665CJA 0°C to +70°C 8 CERDIP ICL7665ACJA 0°C to +70°C 8 CERDIP ICL7665BCJA 0°C to +70°C 8 CERDIP + + + + + + + + + +Denotes a lead(pb)-free/RoHS-compliant package.

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IC L 7 6 6 5 Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (V+ = 5V, TA = +25°C, unless otherwise noted.) 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. Note 1: Due to the SCR structure inherent in the CMOS process used to fabricate these devices, connecting any terminal to volt- ages greater than (V+ + 0.3V) or less than (GND - 0.3V) may cause destructive latchup. For this reason, we recommend that inputs from external sources that are not operating from the same power supply not be applied to the device before its supply is established, and that in multiple supply systems, the supply to the ICL7665 be turned on first. If this is not possi- ble, currents into inputs and/or outputs must be limited to ±0.5mA and voltages must not exceed those defined above. Supply Voltage (Note 1) .........................................-0.3V to +18V Output Voltages OUT1 and OUT2 (with respect to GND) (Note 1) ..........................-0.3V to +18V Output Voltages HYST1 and HYST2 (with respect to V+) (Note 1) .............................+0.3V to -18V Input Voltages SET1 and SET2 (Note 1)........................................(GND - 0.3V) to (V+ + 0.3V) Maximum Sink Output Current OUT1 and OUT2.............................................................25mA Maximum Source Output Current HYST1 and HYST2 ........................................................-25mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW SO (derate 5.88mW/°C above +70°C) ........................471mW CERDIP (derate 8.00mW/°C above +70°C) ................640mW TO-99 (derate 6.67mW/°C above +70°C) ...................533mW Operating Temperature Ranges ICL7665C_ _.......................................................0°C to +70°C ICL7665I_ _ .....................................................-20°C to +85°C ICL7665E_ _....................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V+ ICL7665 TA = +25°C 1.6 16 V TA = TMIN to TMIN 1.8 16 ICL7665A TA = TMIN to TMIN 2.0 16 ICL7665B TA = +25°C 1.6 10 Input Trip Voltage VSET ICL7665, ICL7665B, TA = +25°C VSET1 1.150 1.300 1.450 V VSET2 1.200 1.300 1.400 ICL7665A, TA = +25°C VSET1 1.275 1.300 1.325 VSET2 1.225 1.300 1.375 ICL7665A, TA = TMIN to TMAX VSET1 1.250 1.300 1.350 VSET2 1.215 1.300 1.385 VSET Tempco 100 ppm/°C ROUT1, ROUT2, RHYST1, RHYST2 = 1MΩ 0.004 %/V Supply Current I+ GND ≤ VSET1, VSET2 ≤ V+, all outputs open circuit V+ = 2V 2.5 10 µ A V+ = 9V 2.6 10 V+ = 15V 2.9 15 ICL7665B, TA = +25°C V+ = 2V 2.5 10 V+ = 9V 2.6 10 TA = TMIN to TMIN 1.8 10 ICL7665, TA = +25°C; ICL7665A, TA = TMIN to TMAX Supply Voltage Sensitivity of VSET1, VSET2

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IC L 7 6 6 5 Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (V+ = 5V, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS Output Leakage Current IOLK, IHLK All grades, VSET = 0V or VSET ≥ 2V, TA = +25°C OUT1, OUT2 10 200 nA HYST1, HSYT2 -10 -100 OUT1, OUT2 2000 HYST1, HSYT2 -500 ICL7665B, V+ = 9V, TA = TMIN to TMAX OUT1, OUT2 2000 HYST1, HSYT2 -500 VOUT1 Saturation Voltage VSET1 = 2V, IOUT1 = 2mA ICL7665, ICL7665B: V+ = 2V 0.20 0.50 ICL7665A: V+ = 2V 0.20 All grades: V+ = 5V 0.10 0.30 ICL7665, ICL7665A: V+ = 15V 0.06 0.20 ICL7665B: V+ = 9V 0.06 0.25 All grades: V+ = 2V -0.15 -0.30 All grades: V+ = 5V -0.05 -0.15 ICL7665, ICL665A: V+ = 15V -0.02 -0.10 ICL7665B: V+ = 9V -0.02 -0.15 VOUT2 Saturation Voltage VSET2 = 0V, IOUT2 = 2mA All grades: V+ = 2V 0.20 0.50 V All grades: V+ = 5V 0.15 0.30 ICL7665, ICL665A: V+ = 15V 0.11 0.25 ICL7665B: V+ = 9V 0.11 0.30 VHYST2 Saturation Voltage All grades: V+ = 2V -0.25 -0.80 V All grades: V+ = 5V -0.43 -1.00 ICL7665: V+ = 15V -0.35 -0.80 ICL7665A: V+ = 15V -0.35 -1.00 ICL7665B: V+ = 9V -0.35 -1.00 ISET GND ≤ VSET ≤ V+ ±0.01 ±10 nA ∆ VSET 0.1 mV VSET1– VSET2 ±5 ±50 mV ±0.1 mV SYMBOL V VHYST1 Saturation Voltage V VSET1 = 2V, IHYST1 = -0.5mA ICL7665, ICL7665A, V+ = 15V, TA = TMIN to TMAX VSET2 = 2V, IHYST2 = -0.2mA VSET2 = 2V, IHYST2 = -0.5mA VSET Input Leakage Current ROUT, RHYST = 1MΩ ROUT, RHYST = 1MΩ ROUT = 4.7kΩ , RHYST = 20kΩ , VOUTLO = 1% V+, VOUTHI = 99% V+ VSET Input Change for Complete Output Change Difference in Trip Voltage Output/Hysteresis Difference

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IC L 7 6 6 5 Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection 4 _______________________________________________________________________________________ AC OPERATING CHARACTERISTICS (V+ = 5V, TA = +25°C, unless otherwise noted.) VSET switched between 1.0V and 1.6V, ROUT = 4.7kΩ , CL = 12pF, RHYST = 20kΩ µs 1.8tH2f Output Fall Times 4.0tH1f 0.7tO2f 0.6tO1f VSET switched between 1.0V and 1.6V, ROUT = 4.7kΩ , CL = 12pF, RHYST = 20kΩ µs 0.7tH2r Output Rise Times 7.5tH1r 0.8tO2r 0.6tO1r VSET switched from 1.6V to 1.0V, ROUT = 4.7kΩ , CL = 12pF, RHYST = 20kΩ µs 60tSH2d Output Delay Time, Input Going Low 60tSO2d 80tSH1d 75tSO1d VSET switched from 1.0V to 1.6V, ROUT = 4.7kΩ , CL = 12pF, RHYST = 20kΩ CONDITIONS µs 55tSH2d Output Delay Time, Input Going High 55tSO2d 90tSH1d 85tSO1d UNITSMIN TYP MAXSYMBOLPARAMETER INPUT OUT1 HYST1 OUT2 HYST2 tO1f tSO1d tH1r tSO2d tSH2d tO2r tO2f tSH2d tO1r 1.6V 1.0V V+ (5V) GND V+ (5V) GND V+ (5V) GND V+ (5V) GND VSET1,VSET2 tSH1d tH2r tH2f tSO2d tSH1d tH1f tSO1d _______________________________________________________Switching Waveforms

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IC L 7 6 6 5 Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection _______________________________________________________________________________________ 5 2.0 0 0 15 OUT1 SATURATION VOLTAGE AS A FUNCTION OF OUTPUT CURRENT 0.5 1.5 IC L 7 6 6 5 -0 1 IOUT OUT1 (mA) V O L T A G E S A T U R A T IO N ( V ) 1.0 105 20 V+ = 2V V+ = 9V V+ = 15V V+ = 5V SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE S U P P LY C U R R EN T (µ A ) 0 0 SUPPLY VOLTAGE (V) IC L 7 6 6 5 -0 2 2 4 6 8 10 12 14 16 0.5 1.0 TA = +25°C TA = +70°C 0V ≤ VSET1, VSET2 ≤ V+ 1.5 2.0 2.5 3.0 3.5 5.0 4.5 4.0 TA = -20°C SUPPLY CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE -20 0 20 40 60 AMBIENT TEMPERATURE (°C) IC L 7 6 6 5 -0 3 S U P P LY C U R R EN T (µ A ) 0 0.5 1.5 2.0 2.5 3.0 3.5 4.0 5.0 1.0 4.5 V+ = 15V V+ = 9V V+ = 2V 0V ≤ VSET1, VSET2 ≤ V+ -2.0 -1.6 -1.2 -0.8 -0.4 0 -20 -16 -12 -8 -4 0 HYST1 OUTPUT SATURATION VOLTAGE vs. HYST1 OUTPUT CURRENT H Y S T1 O U TP U T S A TU R A TI O N V O LT A G E (V ) HYST1 OUTPUT CURRENT (mA) IC L 7 6 6 5 -0 4 V+ = 2VV+ = 5V V+ = 9V V+ = 15V -5 -4 -3 -2 -1 0 -5 -4 -3 -2 -1 0 HYST2 OUTPUT SATURATION VOLTAGE vs. HYST2 OUTPUT CURRENT H Y S T2 O U TP U T S A TU R A TI O N V O LT A G E (V ) HYST2 OUTPUT CURRENT (mA) IC L 7 6 6 5 -0 5 V+ = 2V V+ = 15V V+ = 9V V+ = 5V 2.0 1.5 1.0 0.5 0 20151050 OUT2 SATURATION VOLTAGE AS A FUNCTION OF OUTPUT CURRENT V O LT A G E S A TU R A TI O N (V ) IOUT OUT2 (mA) IC L 7 6 6 5 -0 6 V+ = 2V V+ = 5V V+ = 9V V+ = 15V __________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.)

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IC L 7 6 6 5 _______________Detailed Description As shown in the block diagram of Figure 2, the Maxim ICL7665 combines a 1.3V reference with two com- parators, two open-drain N-channel outputs, and two open-drain P-channel hysteresis outputs. The refer- ence and comparator are very low-power linear CMOS circuits, with a total operating current of 10µ A maxi- mum, 3µ A typical. The N-channel outputs can sink greater than 10mA, but are unable to source any cur- rent. These outputs are suitable for wire-OR connections and are capable of driving TTL inputs when an external pull-up resistor is added. The ICL7665 Truth Table is shown in Table 1. OUT1 is an inverting output; all other outputs are noninverting. HYST1 and HYST2 are P-channel current sources whose sources are connected to V+. OUT1 and OUT2 are N-channel current sinks with their sources connect- ed to ground. Both OUT1 and OUT2 can drive at least one TTL load with a VOL of 0.4V. In spite of the very low operating current, the ICL7665 has a typical propagation delay of only 75µ s. Since the comparator input bias current and the output leakages are very low, high-impedance external resistors can be used. This design feature minimizes both the total sup- ply current used and loading on the voltage source that is being monitored. Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection 6 _______________________________________________________________________________________ Figure 1. Test Circuit HYST2 = OFF = LOWOUT2 = ON = LOWVSET2 < 1.3V HYST2 = ON = HIOUT2 = OFF = HIVSET2 > 1.3V HYST1 = OFF = LOWOUT1 = OFF = HIVSET1 < 1.3V HYST1 = ON = HIOUT1 = ON = LOWVSET1 > 1.3V HYSTERESISOUTPUTINPUT* Table 1. ICL7665 Truth Table V+ HYST1 HYST2 OUT1 OUT2 TO V+ SET2 SET1 1.3V BANDGAP REFERENCE Figure 2. Block Diagram 1 2 3 4 8 7 6 5 ICL7665 OUT1 HYST1 SET1 GND V+ OUT2 SET2 HSYT2 12pF 12pF 12pF 12pF OUT1 HYST1 OUT2 HSYT2 4.7k 4.7k V+ 1.6V 1.0V INPUT 20k20k * See Electrical Characteristics OUT1 is an inverting output; all others are noninverting. OUT1 and OUT2 are open-drain, N-channel current sinks. HYST1 and HYST2 are open-drain, P-channel current sinks.

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Basic Over/Undervoltage Detection Circuits Figures 3, 4, and 5 show the three basic voltage detec- tion circuits. The simplest circuit, depicted in Figure 3, does not have any hysteresis. The comparator trip-point formulas can easily be derived by observing that the comparator changes state when the VSET input is 1.3V. The exter- nal resistors form a voltage divider that attenuates the input signal. This ensures that the VSET terminal is at 1.3V when the input voltage is at the desired compara- tor trip point. Since the bias current of the comparator is only a fraction of a nanoamp, the current in the volt- age divider can be less than one microamp without los- ing accuracy due to bias currents. The ICL7665A has a 2% threshold accuracy at +25°C, and a typical temper- ature coefficient of 100ppm/°C including comparator offset drift, eliminating the need for external poten- tiometers in most applications. Figure 4 adds another resistor to each voltage detector. This third resistor supplies current from the HYST out- put whenever the VSET input is above the 1.3V thresh- old. As the formulas show, this hysteresis resistor affects only the lower trip point. Hysteresis (defined as the difference between the upper and lower trip points) keeps noise or small variations in the input signal from repeatedly switching the output when the input signal remains near the trip point for a long period of time. The third basic circuit, Figure 5, is suitable only when the voltage to be detected is also the power-supply voltage for the ICL7665. This circuit has the advantage that all of the current flowing through the input divider resistors flows through the hysteresis resistor. This allows the use of higher-value resistors, without hysteresis output leakage having an appreciable effect on the trip point. Resistor-Value Calculations Figure 3 1) Choose a value for R11. This value determines the amount of current flowing though the input divider, equal to VSET / R11. R11 can typically be in the range of 10kΩ to 10MΩ . 2) Calculate R21 based on R11 and the desired trip point: VTRIP – VSET VTRIP – 1.3V R21 = R11 (———————)= R11 (——————)VSET 1.3V IC L 7 6 6 5 Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection _______________________________________________________________________________________ 7 Figure 3. Simple Threshold Detector Figure 4. Threshold Detector with Hysteresis ICL7665 OUT1 OUT2 SET2SET1 R21 R11 R22 R12 VIN1 V+ VIN2 OUT1 VIN1 VTRIP1 VTRIP2 OUT2 VIN2 ICL7665 OUT1 OUT2 SET2SET1 R21 R11 R22 R12 VIN1 V+ VIN2 HYST1 HYST2 R31 R32 V+ OUT1 VL1 VU1 0V V+ VU2 OUT2 VIN1 0V VL2VIN2

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IC L 7 6 6 5 Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection 8 _______________________________________________________________________________________ Figure 4 1) Choose a resistor value for R11. Typical values are in the 10kΩ to 10MΩ range. 2) Calculate R21 for the desired upper trip point, VU, using the formula: VU - VSET VU – 1.3V R21 = R11 (——————) = R11 (—————)VSET 1.3V 3) Calculate R31 for the desired amount of hysteresis: (R21) (V+ – VSET) (R21) (V+ – 1.3V) R31 = ————————— = ————————— VU – VL VU – VL or, if V+ = VIN: (R21) (VL – VSET) (R21) (VL – 1.3V) R31 = ————————— = ————————— VU – VL VU – VL 4) The trip voltages are not affected by the absolute value of the resistors, as long as the impedances are high enough that the resistance of R31 is much greater than the HYST output’s resistance, and the current through R31 is much higher than the HYST output’s leakage current. Normally, R31 will be in the 100kΩ to 22MΩ range. Multiplying or dividing all three resistors by the same factor will not affect the trip voltages. Figure 5 1) Select a value for R11, usually between 10kΩ and 10MΩ . 2) Calculate R21: VL – VSET VL – 1.3V R21 = R11 (——————) = R11 (—————)VSET 1.3 3) Calculate R31: VU – VL R31 = R11 (—————)VSET 4) As in the other circuits, all three resistor values may be scaled up or down in value without changing VU and VL. VU and VL depend only on the ratio of the three resistors, if the absolute values are such that the hysteresis output resistance and the leakage currents of the VSET input and hysteresis output can be ignored. __________Applications Information Fault Monitor for a Single Supply Figure 6 shows a typical over/undervoltage fault monitor for a single supply. In this case, the upper trip points (con- trolling OUT1) are centered on 5.5V, with 100mV of hys- teresis (VU = 5.55V, VL = 5.45V); and the lower trip points (controlling OUT2) are centered on 4.5V, also with 100mV of hysteresis. OUT1 and OUT2 are connected together in a wire-OR configuration to generate a power-OK signal. Multiple-Supply Fault Monitor The ICL7665 can simultaneously monitor several power supplies, as shown in Figure 7. The easiest way to calculate the resistor values is to note that when the VSET input is at the trip point (1.3V), the current through R11 is 1.3V / R11. The sum of the currents through R21A, R21B and R31 must equal this current when the two input voltages are at the desired low-voltage detection point. Ordinarily, R21A and R21B are chosen so that the current through the two resis- tors is equal. Note that, since the voltage at the ICL7665 VSET input depends on the voltage of both supplies being monitored, there will be some interaction between the low- voltage trip points for the two supplies. In this example, OUT1 will go low when either supply is 10% below nominal (assuming the other supply is at the nominal voltage), or when both supplies are 5% or more below their nominal voltage. R31 sets the hysteresis, in this case, to about 43mV at the 5V supply or 170mV at the 15V supply. The second section of ICL7665 can be used to detect overvoltage or, as shown in Figure 7, can be used to detect the absence of negative supplies. Note that the trip points for OUT2 depend on both the voltages of the negative power supplies and the actual voltage of the +5V supply. Figure 5. Threshold Detector, VIN = V+ VL2 VU2 ICL7665 OUT1 OUT2 SET2SET1 R21 R11 VIN HYST1 HYST2 OUT1 OUT2 VIN V+ GND OVERVOLTAGE UNDERVOLTAGE R31 R32 R22 R12 VL1 VU1

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IC L 7 6 6 5 Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection _______________________________________________________________________________________ 9 Combination Low-Battery Warning and Low-Battery Disconnect Nickel cadmium (NiCd) batteries are excellent recharge- able power sources for portable equipment, but care must be taken to ensure that NiCd batteries are not damaged by overdischarge. Specifically, a NiCd battery should not be discharged to the point where the polarity of the lowest-capacity cell is reversed, and that cell is reverse charged by the higher-capacity cells. This reverse charging will dramatically reduce the life of a NiCd battery. The Figure 8 circuit both prevents reverse charging and gives a low-battery warning. A typical low-battery warning voltage is 1V per cell. Since a NiCd “9V” battery is ordi- narily made up of six cells with a nominal voltage of 7.2V, a low-battery warning of 6V is appropriate, with a small hysteresis of 100mV. To prevent overdischarge of a bat- tery, the load should be disconnected when the battery voltage is 1V x (N – 1), where N = number of cells. In this case, the low-battery load disconnect should occur at 5V. Since the battery voltage will rise when the load is disconnected, 800mV of hysteresis is used to prevent repeated on/off cycling. Power-Fail Warning and Power-Up/Power-Down Reset Figure 9 illustrates a power-fail warning circuit that monitors raw DC input voltage to the 7805 three-termi- nal 5V regulator. The power-fail warning signal goes high when the unregulated DC input falls below 8.0V. When the raw DC power source is disconnected or the AC power fails, the voltage on the input of the 7805 decays at a rate of IOUT / C (in this case, 200mV/ms). Since the 7805 will continue to provide a 5V output at 1A until VIN is less than 7.3V, this circuit will give at least 3.5ms of warning before the 5V output begins to drop. If additional warning time is needed, either the trip voltage or filter capacitance should be increased, or the output current should be decreased. The ICL7665 OUT2 is set to trip when the 5V output has decayed to 3.9V. This output can be used to prevent the microprocessor from writing spurious data to a CMOS battery-backup memory, or can be used to acti- vate a battery-backup system. AC Power-Fail and Brownout Detector By monitoring the secondary of the transformer, the cir- cuit in Figure 10 performs the same power-failure warn- ing function as Figure 9. With a normal 110V AC input to the transformer, OUT1 will discharge C1 every 16.7ms when the peak transformer secondary voltage exceeds 10.2V. When the 110V AC power-line voltage is either interrupted or reduced so that the peak voltage is less than 10.2V, C1 will be charged through R1. OUT2, the power-fail warning output, goes high when the voltage on C1 reaches 1.3V. The time constant R1 x C1 determines the delay time before the power-fail warning signal is activated, in this case 42ms or 21⁄2 line cycles. Optional components R2, R3 and Q1 add hysteresis by increasing the peak secondary voltage required to dis- charge C1 once the power-fail warning is active. Battery Switchover Circuit The circuit in Figure 11 performs two functions: switch- ing the power supply of a CMOS memory to a backup battery when the line-powered supply is turned off, and lighting a low-battery-warning LED when the backup battery is nearly discharged. The PNP transistor, Q1, connects the line-powered +5V to the CMOS memory whenever the line-powered +5V supply voltage is greater than 3.5V. The voltage drop across Q1 will only be a couple of hundred millivolts, since it will be satu- rated. Whenever the input voltage falls below 3.5V, OUT1 goes high, turns off Q1, and connects the 3V lithium cell to the CMOS memory. The second voltage detector of the ICL7665 monitors the voltage of the lithium cell. If the battery voltage falls below 2.6V, OUT2 goes low and the low-battery-warning LED turns on (assuming that the +5V is present, of course). Another possible use for the second section of the ICL7665 is the detection of the input voltage falling below 4.5V. This signal could then be used to prevent the microprocessor from writing spurious data to the CMOS memory while its power-supply voltage is out- side its guaranteed operating range. Simple High/Low Temperature Alarm The circuit in Figure 12 is a simple high/low tempera- ture alarm, which uses a low-cost NPN transistor as the sensor and an ICL7665 as the high/low detector. The NPN transistor and potentiometer R1 form a Vbe multi- plier whose output voltage is determined by the Vbe of the transistor and the position of R1’s wiper arm. The voltage at the top of R1 will have a temperature coeffi- cient of approximately -5mV/°C. R1 is set so that the voltage at VSET2 equals the VSET2 trip voltage when the temperature of the NPN transistor reaches the level selected for the high-temperature alarm. R2 can be adjusted so that the voltage at VSET1 is 1.3V when the NPN transistor’s temperature reaches the low-tempera- ture limit.

ICL7665AESA+T Reviews

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June 29, 2020

Absolutely the best source for wire, connectors, terminal strips, panel lights, etc. for model railroaders. Web site is the best in the business.


June 28, 2020

Purchased this in May and didn't use it until last week. worked and all was good.


June 24, 2020

Bought these to help prevent solar panels from feeding back. Works great and doesn't get as hot.


June 20, 2020

Sure appreciate your quality, expertise and professional service. Thank you so much!!!


June 19, 2020

the parts work as they should. Amazing price perfect all round many thanks

Ju***** Ali

June 10, 2020

It arrived earlier than the deadline. All is OK. Thank you


June 1, 2020

This help solved the extra electricity flowing back.


May 31, 2020

Competitively priced set of diodes, tested as described. Quality is about what you would expect for no- or off-brand.


May 23, 2020

They work great and I hope to find more used for the extra ones.


May 14, 2020

received with well packed and good parts, every piece of the ICL7665AESA+T works well.

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