LM360N High-Speed Differential Comparator

Overview

The LM160/LM360 is a high-speed differential input comparator with complementary TTL outputs, designed as an improved replacement for the µA760/µA760C. This device offers enhanced performance characteristics, including greater speed, higher input impedance, improved fan-out capability, and lower input offset voltage. The LM360N is optimized for applications requiring fast response times, with typical propagation delay variations as low as 3 ns over varying input conditions.

Key Features

• High-Speed Operation: Guaranteed maximum propagation delay of 20 ns.
• Differential Input: Compatible with differential signals for precise comparison.
• Complementary TTL Outputs: Provides both inverting and non-inverting outputs for flexible logic interfacing.
• Improved Input Impedance: Higher input impedance reduces loading effects on signal sources.
• Enhanced Fan-Out: Capable of driving multiple TTL loads without performance degradation.
• Low Input Offset Voltage: Minimizes errors in precision comparison applications.
• Pin-for-Pin Replacement: Direct replacement for µA760/µA760C with superior performance.

Applications

The LM360N is suitable for a wide range of high-speed comparison and signal processing applications, including:

• High-speed analog-to-digital converters (ADCs)
• Precision voltage level detection
• Oscillators and pulse generators
• Signal conditioning circuits
• Threshold detectors
• Line receivers and communication interfaces
• Test and measurement equipment

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): +7V
• Differential Input Voltage: ±5V
• Input Voltage Range: -0.3V to V_CC + 0.3V
• Output Short-Circuit Duration: Continuous (with proper heat sinking)
• Operating Temperature Range: 0°C to +70°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): +5V ±5%
• Input Common Mode Voltage Range: -0.5V to V_CC - 1.5V
• Output Load Current: 16mA (sink or source)
• Ambient Temperature: 0°C to +70°C

DC Electrical Characteristics

• Input Offset Voltage: 5mV (max)
• Input Bias Current: 25µA (max)
• Input Offset Current: 10µA (max)
• Input Resistance: 30kΩ (min)
• Output High Voltage: 2.4V (min) at -16mA
• Output Low Voltage: 0.4V (max) at 16mA
• Supply Current: 30mA (max)

AC Electrical Characteristics

• Propagation Delay (t_PLH, t_PHL): 20ns (max)
• Rise Time (t_r): 5ns (max)
• Fall Time (t_f): 5ns (max)
• Delay Variation with Overdrive: 3ns (typical)

Package Information

The LM360N is available in a standard 8-pin dual in-line package (DIP) with the following mechanical specifications:

• Package Type: PDIP-8
• Dimensions: 9.81mm x 6.35mm x 3.3mm (body)
• Pin Spacing: 2.54mm (0.1") between pins, 7.62mm (0.3") row-to-row
• Lead Material: Copper alloy
• Finish: Matte tin
• Weight: Approximately 0.65 grams

Pin Configuration

• Pin 1: Output A (Inverting)
• Pin 2: Output B (Non-Inverting)
• Pin 3: V_CC (Positive Supply)
• Pin 4: Ground
• Pin 5: Inverting Input (-IN)
• Pin 6: Non-Inverting Input (+IN)
• Pin 7: Strobe (Active Low)
• Pin 8: NC (No Connection)

Design Considerations

Power Supply Decoupling

For optimal performance, a 0.1µF ceramic capacitor should be placed as close as possible between the V_CC and ground pins to minimize power supply noise and ensure stable operation.

Input Protection

While the device features internal input protection, external clamping diodes may be required in applications where input voltages may exceed the absolute maximum ratings.

Thermal Management

Under normal operating conditions, the LM360N does not require additional heat sinking. However, in high ambient temperature environments or when driving heavy loads, thermal considerations should be evaluated.

Reliability and Qualification

The LM360N is manufactured using a high-reliability silicon-gate process and is subjected to rigorous quality control testing. The device meets or exceeds the following standards:

• MIL-STD-883 Method 5005 (Environmental Stress Screening)
• JEDEC JESD22-A104 (Temperature Cycling)
• JESD22-A101 (Steady-State Temperature Humidity Bias Life Test)

Ordering Information

The device is available in several packaging options:

• LM360N: Plastic DIP, commercial temperature range (0°C to +70°C)
• LM360AN: Improved specifications version
• LM360FN: Ceramic DIP package