LM319 - Precision High-Speed Dual Comparator

Overview

The LM319 is a precision high-speed dual comparator fabricated on a single monolithic chip. Designed for versatility, it operates over a wide range of supply voltages, including a single 5V logic supply and ground. The LM319 offers superior performance compared to older devices like the LM710, with higher gain, lower input currents, and faster response times. Its robust design makes it suitable for both analog and digital applications, particularly where high-speed signal processing is required.

The device features an uncommitted collector output stage, allowing for flexible interfacing with various logic families. Although optimized for digital logic supplies, the LM319 is fully specified for power supplies up to ±15V, making it a versatile choice for mixed-signal systems.

Features

• Dual Independent Comparators: Contains two separate comparators on a single chip, enabling compact and efficient designs.
• Wide Supply Voltage Range: Operates from a single 5V supply up to ±15V, accommodating both digital and analog applications.
• High-Speed Response: Typical response time of 80 ns at ±15V, ensuring rapid signal processing.
• Low Input Current: Maximum input current of 1 mA over the full temperature range, minimizing loading effects.
• High Common-Mode Slew Rate: Enhances performance in dynamic signal environments.
• Flexible Output Configuration: Uncommitted collector output allows for easy interfacing with TTL, CMOS, and other logic families.
• Isolated Inputs and Outputs: Can be isolated from system ground for improved noise immunity.
• Minimum Fan-Out of 2: Ensures reliable driving of downstream logic circuits.

Applications

The LM319 is widely used in applications requiring high-speed signal comparison and precision timing. Key application areas include:

• Analog-to-Digital Converters (ADCs): Provides fast and accurate voltage level detection.
• Oscillators and Timers: Enables precise timing control in pulse generation circuits.
• Voltage Monitoring: Used in power supply supervision and battery management systems.
• Signal Conditioning: Ideal for filtering and threshold detection in sensor interfaces.
• Digital Logic Interfaces: Facilitates level shifting and signal conversion between logic families.
• Motor Control: Provides fast response for overcurrent and fault detection.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V+ to V-): ±18V
• Input Voltage: ±15V
• Output Sink Current: 20 mA
• Operating Temperature Range: -55°C to +125°C
• Storage Temperature Range: -65°C to +150°C

Typical Performance Characteristics

• Response Time (to 5V step): 80 ns (typical) at ±15V
• Input Bias Current: 150 nA (typical) at 25°C
• Input Offset Voltage: 2 mV (typical)
• Common-Mode Rejection Ratio (CMRR): 90 dB (typical)
• Supply Current (per comparator): 5 mA (typical) at ±15V

Package Information

The LM319 is available in multiple package options to suit different assembly and thermal requirements. Below are the most common configurations:

• 8-Pin PDIP (Plastic Dual In-Line Package): Industry-standard through-hole package for easy prototyping and testing.
• 8-Pin SOIC (Small Outline Integrated Circuit): Surface-mount package for space-constrained applications.
• TO-99 Metal Can: Hermetically sealed package for high-reliability environments.

Pin Configuration (8-Pin PDIP/SOIC)

• Pin 1: Output 1
• Pin 2: Inverting Input 1
• Pin 3: Non-Inverting Input 1
• Pin 4: V- (Negative Supply)
• Pin 5: Non-Inverting Input 2
• Pin 6: Inverting Input 2
• Pin 7: Output 2
• Pin 8: V+ (Positive Supply)

Conclusion

The LM319 is a high-performance dual comparator that combines speed, precision, and versatility. Its ability to operate from a single 5V supply or dual ±15V supplies makes it suitable for a wide range of applications, from digital logic interfaces to analog signal conditioning. With its robust electrical characteristics and flexible packaging options, the LM319 remains a popular choice for engineers designing high-speed and precision circuits.