LT1720CS8#TRPBF

Overview

The LT1720CS8#TRPBF is a dual ultrafast comparator from Analog Devices, optimized for single-supply operation within a voltage range of 2.7V to 6V. It features rail-to-rail outputs compatible with TTL and CMOS logic levels. The device offers a propagation delay of 4.5ns at 20mV overdrive and 7ns at 5mV overdrive. Supply current consumption is 4mA per comparator at 5V. The input common-mode voltage range extends from 100mV below ground to 1.2V below the supply voltage. Internal hysteresis is specified at 3.5mV typical. The component is housed in an 8-lead Plastic SO package.

Feature Summary

• Ultrafast response time with 4.5ns propagation delay at 20mV overdrive
• Rail-to-rail output stage directly interfaces with TTL and CMOS logic
• Input voltage range extends 100mV below the negative supply rail
• Integrated internal hysteresis prevents oscillation with slow-moving signals

Applications

• Crystal oscillator circuits
• High-speed differential line receivers
• Window comparators and threshold detectors
• Zero-crossing detectors
• High-speed sampling circuits

Procurement Notes

Verify that the specific ordering suffix #TRPBF corresponds to tape and reel packaging as defined by the manufacturer's official documentation. Confirm the C grade temperature range (0°C to 70°C) matches the application requirements. Ensure the 8-lead SO package dimensions align with the target PCB footprint. Cross-reference the lead-free finish status with current environmental compliance standards.

Selection Notes

Select this component when high speed and low power are critical constraints. The dual configuration reduces board space compared to single units. The wide common-mode input range simplifies interfacing with signals near ground potential. Internal hysteresis eliminates the need for external components in many noise-prone environments. Verify that the 4mA quiescent current fits the system power budget.

Part Context

This part belongs to the LT1720/LT1721 family of ultrafast comparators designed for single-supply applications. The LT1720 provides two comparators in an 8-pin package, while the LT1721 offers four in a 16-pin package. Both share identical electrical characteristics and pinouts for corresponding channels. The family is characterized by complementary bipolar technology enabling high slew rates and low power consumption simultaneously.

Replacement Considerations

LT1720CS8#PBF: Identical electrical specifications and functionality; differs only in tube packaging instead of tape and reel.