The LM393 is a low-power dual comparator integrated circuit (IC) that is widely used in analog applications. It consists of two independent, high-gain, internally compensated comparators that are capable of comparing voltages and generating an output based on the comparison result. Below is an overview of the LM393 datasheet, which covers its features, specifications, and typical applications.
+-----------+
Vcc | 1 8 | Vcc
-In | 2 7 | -In
+In | 3 6 | +In
Out | 4 5 | Out
+-----------+
| Parameter | Min | Typ | Max | Unit | |---------------------------|-------|-------|-------|-----------| | Supply Voltage (Vcc) | 2.0 | 5.0 | 36.0 | V | | Input Voltage (V_in) | 0 | Vcc | Vcc | V | | Output Low Voltage (V_out) | 0 | - | 0.4 | V | | Output High Voltage (V_out)| Vcc-1.5 | - | Vcc | V | | Input Bias Current (I_b) | - | 50nA | 250nA | A | | Output Saturation Voltage | - | 100mV | - | V | | Quiescent Current (I_q) | - | 1.0uA | 10uA | A | | Operating Temperature | -40 | - | 85 | °C |
| Parameter | Value | |------------------------------|-------| | Supply Voltage (Vcc) | 2.0V to 36V | | Input Offset Voltage | 2mV max | | Input Bias Current | 0.5nA max | | Output Voltage High (V_OH) | Vcc - 1.5V | | Output Voltage Low (V_OL) | 0.4V max | | Propagation Delay Time | 300ns | | Power Supply Current (Icc) | 1mA max |
In a typical comparator circuit, the LM393 is used to compare two voltages. When the voltage at the non-inverting input (+In) exceeds the voltage at the inverting input (-In), the output will be pulled low. Conversely, when the voltage at the inverting input exceeds the non-inverting input, the output will be pulled high.
Vcc
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|
[R_pull-up]
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+------- Out
|
+In ---|
| LM393
-In ---|
|
GND
The LM393 can also be used in a Schmitt trigger configuration to provide hysteresis. This helps eliminate noise and ensures stable switching behavior.
Vcc
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|
[R_pull-up]
|
+------- Out
|
+In ---|
| LM393
|
-In ----|
|
GND
The LM393 is commonly used in window comparator circuits to detect whether an input voltage lies within a specified range.
+----+---+----+
| | | |
[V_ref1] [V_ref2]
| | | |
+----+---+----+
|
LM393
|
Out
The LM393 dual comparator is a versatile and widely used component in analog systems. Its low power consumption, wide voltage range, and open collector output make it suitable for a variety of applications in industrial, automotive, and consumer electronics. The datasheet highlights key specifications that make it easy to integrate into various circuits, offering both flexibility and reliability for analog signal processing tasks.