ICL7665 Maxim Integrated Products, ICL7665 Datasheet
ICL7665
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ICL7665 Summary of contents
Page 1
... V threshold and guaranteed performance over SET1 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 ...
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... 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. ...
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... ICL7665, ICL7665A 15V ICL7665B All grades All grades 2V, SET1 I = -0.5mA HYST1 ICL7665, ICL665A 15V ICL7665B All grades All grades 0V, SET2 I = 2mA ICL7665, ICL665A 15V OUT2 ICL7665B 2V, SET2 All grades -0.2mA HYST2 All grades ICL7665 15V V = 2V, SET2 I = -0.5mA ICL7665A 15V HYST2 ...
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Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection AC OPERATING CHARACTERISTICS ( +25°C, unless otherwise noted.) A PARAMETER SYMBOL t SO1d t Output Delay Time, SH1d Input Going High t SO2d t SH2d t SO1d t Output ...
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Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A OUT1 SATURATION VOLTAGE AS A FUNCTION OF OUTPUT CURRENT ...
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... 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+ ...
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... 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 ...
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... 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 ...
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... 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 ...
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... ICL7665 SET2 SET1 R11 OUT2 OUT1 301k 49.9k +5V -5V -15V POWER OK +5V, 1A 100 OUTPUT OUT1 OUT2 SENSE ICL7663 SET GND LOW-BATTERY WARNING 7805 4700 F 5V REGULATOR +5V V+ HYST1 HYST2 R1 ICL7665 SET1 SET2 R2 OUT1 OUT2 POWER-FAIL 100k 787k 5V, 1A WARNING ...
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... TEMPERATURE LIMIT ADJUSTMENT Figure 12. Simple High/Low Temperature Alarm ______________________________________________________________________________________ Q1 1k 2N7000 1M OUT1 V+ HYST1 HYST2 5.6M ICL7665 SET1 SET2 1M GND OUT2 V+ HYST2 HYST1 R4 22M ICL7665 SET2 R5 27k OUT2 OUT1 CMOS MEMORY 1 F 2N4393 3V 22M 1.15M LITHIUM 1% CELL LOW-TEMPERATURE 22M LIMIT ADJUST SET1 ...
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... NiCd and lead acid batteries; b) the battery is connected directly to the ICL7665 or is switched on via a mechanical switch with low resistance there is little or no input filter capacitance near the ICL7665. In line- ...