1. Overview & Functionality

️· Device: LR393
️· Type: Dual Comparator
️· Purpose: The LR393 is a dual comparator integrated circuit (IC). Comparators are used to compare two voltages and output a high or low signal depending on which voltage is greater. The "dual" designation means there are two independent comparators within the same chip.
️· Applications: This comparator is suitable for a wide variety of applications, including:
- Zero-crossing detectors
- Waveform shaping
- Voltage comparators
- Fast response time for fast logic circuits
- Temperature detection

2. Pinout & Description (Refer to the diagram in the full document)

️· Dual supply voltages: Able to work with single or dual supply voltages
️· Common pins: Each comparator has an Inverting Input (–), a Non-inverting Input (+), an Output (Out), and a Ground (GND) pin. A VCC (Positive Supply) pin.

3. Absolute Maximum Ratings

️· Supply Voltage (Single): 18V to 36V
️· Supply Voltage (Dual): 36V
️· Differential Input Voltage: 36V
️· Input Common-Mode Voltage Range: 0V to 36V – 2.0V (relative to VCC)
️· Output Short-Circuit Current: 20mA
️· Input Current: 50mA
️· Junction Temperature: 125°C
️· Power Dissipation: 570mW
️· Operating Temperature Range: 0°C to 70°C
️· Storage Temperature Range: -65°C to 150°C

4. Electrical Characteristics (Key Values)

️· Input Offset Voltage: Typically 1.0mV to 5.0mV (can be up to 9.0 mV over temp)
️· Input Offset Current: Typically 5.0nA to 50nA (can be up to 150nA over temp)
️· Input Bias Current: Typically 25nA to 250nA (can be up to 400nA over temp)
️· Input Common-Mode Voltage Range: 0V to 36V – 2.0V
️· Supply Current (Dual Comparators): 0.4mA to 1.0mA
️· Voltage Gain: 50 to 200 V/mV
️· Response Times: Measured in nanoseconds (ns) - typically around 300ns to 1.3ns

5. Application Circuits (Examples)

️· Zero Crossing Detector: This circuit detects when a waveform crosses a specific voltage level. Can be used with a single or dual supply
️· Free-Running Square Wave Oscillator: This configuration uses the comparator to generate a square wave signal.
️· Time Delay Generator: The comparator is used in conjunction with a timing capacitor to create a time delay circuit.

6. Mechanical Dimensions

️· The datasheet includes detailed mechanical drawings for both DIP-8 (Dual Inline Package) and SOP-8 (Small Outline Package) versions of the IC. These drawings provide the physical dimensions of the chip.

Key takeaways:

️· Fast and Versatile: The LR393 is a relatively fast and versatile dual comparator suitable for a wide range of applications.
️· Wide Voltage Range: It can operate with a wide range of supply voltages.
️· Important Specs: Pay close attention to the offset voltage, bias current, and response times when designing circuits using this IC.