LM393P，DUAL DIFFERENTIAL COMPARATORS
Single Supply or Dual Supplies
Wide Range of Supply Voltage
Max Rating …2 V to 36 V
Tested to 30 V . . . Non-V Devices
Tested to 32 V … V-Suffix Devices
Low Supply-Current Drain Independent of Supply Voltage 0.4 mA Typ Per
ComparatorLow Input Bias Current 25 nA Typ
Low Input Offset Current …3 nA Typ
Low Input Offset Voltage …2 mV Typ
Common-Mode Input Voltage Range Includes Ground
Differential Input Voltage Range Equal to Maximum-Rated Supply Voltage . . . ±36 V
Low Output Saturation Voltage
Output Compatible With TTL, MOS, and CMOS
These devices consist of two independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages. Operation from dual supplies also is possible as long as the difference between the two supplies is 2 V to 36 V, and VCC is at least 1.5 V more positive than the input common-mode voltage. Current drain is independent of the supply voltage. The outputs can be connected to other open-collector outputs to achieve wired-AND relationships
LM393P is a linear voltage comparator IC that can compare two different voltage inputs and output a high or low level based on their relative size. Therefore, its most commonly used application is to detect and control voltage levels, such as:
1 Threshold detection, outputting a high-level signal when a voltage reaches a pre-set threshold.
2 Temperature control, adjusting heater power by comparing a thermistor and reference voltage
3 Liquid level detection, detecting the level of liquid by comparing a liquid level sensor and reference voltage
4 Power supply monitoring, detecting the stability of a power supply by comparing the input voltage and reference voltage. Etc.
