LT1720IS8#TR

Overview

The LT1720IS8#TR is a dual ultrafast comparator from Analog Devices, optimized for single-supply operation with a voltage range of 2.7V to 6V. It features rail-to-rail outputs compatible with TTL and CMOS logic levels. The device includes internal hysteresis to handle slow-moving input signals effectively. Propagation delay is specified at 4.5ns with 20mV overdrive and 7ns with 5mV overdrive. Each comparator draws 4mA of supply current at 5V. The component is housed in an 8-lead SOIC package.

Feature Summary

• Ultrafast propagation delay of 4.5ns at 20mV overdrive
• Rail-to-rail outputs directly interface with TTL and CMOS logic
• Internal hysteresis simplifies usage with slow-moving input signals
• Input voltage range extends 100mV below the negative rail

Applications

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

Procurement Notes

Verify the specific suffix #TR indicates tape and reel packaging configuration. Confirm the IS8 designation corresponds to the industrial temperature grade (-40°C to 85°C) and the SOIC-8 package type. Ensure compatibility with the required supply voltage range of 2.7V to 6V for the target application environment.

Selection Notes

Select this component when high speed and low power consumption are critical requirements. The rail-to-rail output capability allows direct interfacing with standard digital logic without additional level shifting. The internal hysteresis reduces the need for external components, saving board space and design complexity compared to comparators lacking this feature.

Part Context

This part belongs to the LT1720/LT1721 family of ultrafast comparators designed for single-supply applications. The LT1720 provides two independent comparators in an 8-pin package, while the LT1721 offers four channels. Both families share similar electrical characteristics and pinout optimizations to minimize parasitic effects.

Replacement Considerations

LT1720IS8#PBF is the lead-free equivalent in tube packaging. LT1720IMS8#TRPBF serves as a replacement in MSOP packaging. LT1721 variants offer quad-channel configurations if more comparators are needed.