LT1715HMS#PBF

Overview

The LT1715HMS#PBF is an UltraFast dual comparator optimized for low voltage operation, housed in a 10-lead plastic MSOP package. It features independent input and output power supplies, allowing separate analog input ranges and output logic levels without performance loss. The device achieves a propagation delay of 4ns at 20mV overdrive and supports a maximum toggle frequency of 150MHz. Input voltage range extends from 100mV below VEE to 1.2V below VCC. Internal hysteresis ensures stable operation with slow-moving signals, while rail-to-rail outputs interface directly with TTL and CMOS logic.

Feature Summary

• Features separate input and output power supplies for flexible voltage configuration
• Provides internal hysteresis to handle noisy or slow-moving input signals
• Delivers rail-to-rail outputs compatible with TTL and CMOS logic levels
• Optimized pinout placement minimizes parasitic effects for high-speed use

Applications

• High speed differential line receivers
• Level translators
• Window comparators
• Crystal oscillator circuits
• Threshold detectors and discriminators

Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and tube packaging when ordering. Confirm the H grade corresponds to the extended temperature range of -40°C to 125°C. Ensure supply voltages adhere to absolute maximum ratings to prevent damage. Check datasheet for thermal resistance specifications relative to PCB copper area attached to Pin 5.

Selection Notes

Select this component when independent input and output supply rails are required to decouple analog input ranges from digital output logic levels. Choose the H variant for applications requiring operation up to 125°C. Consider the 150MHz toggle frequency limit and 4ns propagation delay for high-speed signal processing needs. Verify that the 100mV negative rail extension meets the specific common mode requirements of the application.

Part Context

The LT1715 belongs to Analog Devices' UltraFast comparator family, designed for high-speed signal processing. It shares architectural similarities with the LT1719 single comparator and the LT1720/LT1721 dual/quad single-supply variants. The device utilizes a PNP differential input stage with Schottky protection diodes to handle large differential signals safely.

Replacement Considerations

LT1719IMS8#PBF

FAQ

How does the LT1715 handle inputs exceeding the common mode range?

If one input remains within the common mode limits, the other input can exceed these limits while maintaining correct output polarity. Phase reversal protection prevents false inversion if both inputs fall below the negative limit.

What is the purpose of the separate +VS and VCC pins?

Separate supplies allow independent optimization of the analog input stage (VCC/VEE) and the digital output stage (+VS/GND), enabling flexible level translation without compromising speed or accuracy.