LT1394CMS8#PBF

Overview

The LT1394CMS8#PBF is a single-channel, ground-sensing analog comparator manufactured by Analog Devices Inc. It features complementary CMOS and TTL outputs with an internal latch for data retention. The device operates from a single 5V supply or dual ±5V supplies, drawing a typical positive supply current of 6mA. Key electrical specifications include a maximum propagation delay of 7ns (with a maximum of 9ns under specific conditions), an input offset voltage of 0.8mV, and a common mode rejection ratio of 100dB. It is housed in an 8-lead MSOP package.

Feature Summary

• Features complementary outputs designed to interface directly with TTL or CMOS logic families.
• Includes an internal latch capability that retains output data when the LATCH pin is held high.
• Input common mode range extends down to the negative supply rail, allowing ground sensing.
• Remains stable during slow signal transitions without requiring a minimum input slew rate.

Applications

• High-speed A/D converters
• Zero-crossing detectors
• Current sense circuits for switching regulators
• Fast pulse height/width discriminators

Procurement Notes

Verify the suffix CMS8 corresponds to the commercial temperature range and MSOP package. Confirm RoHS compliance status as specified in the latest manufacturer documentation. Ensure the ordering part number matches the required lead frame finish and tape/reel or tube packaging options available from authorized distributors.

Selection Notes

Select this component for applications requiring fast response times with low power consumption. The ground-sensing input capability simplifies single-supply designs. The integrated latch feature reduces external component count for data holding applications. Verify that the 7ns propagation delay meets the system timing requirements compared to slower general-purpose comparators.

Part Context

This part belongs to the UltraFast comparator series from Analog Devices. It is pin-compatible with legacy parts such as the LT1016, LT1116, and LT1671, facilitating direct upgrades in existing designs. The MSOP package offers a compact footprint suitable for space-constrained printed circuit board layouts.

Replacement Considerations

LT1394CS8#PBF

FAQ

Can the inputs exceed the positive supply voltage?

Yes, either input may go above the positive common mode limit without damaging the comparator, provided the current does not exceed absolute maximum ratings.

What is the function of the LATCH ENABLE pin?

When held high, the LATCH ENABLE pin causes the outputs to remain in a latched condition, independent of the current state of the inputs.