LTC1540CDD#PBF

Overview

The LTC1540CDD#PBF is a nanopower single comparator with an integrated 1.182V reference, housed in an 8-lead (3mm × 3mm) plastic DFN package. It operates from a single 2V to 11V supply or dual ±1V to ±5.5V supplies. The device features ultralow quiescent current of 0.3µA typical, TTL/CMOS compatible outputs capable of sourcing up to 40mA, and adjustable hysteresis via the HYST pin. Input common mode range extends from V– to V+ – 1.3V, while propagation delay is 60µs at 10mV overdrive.

Feature Summary

• Ultralow quiescent current consumption for battery-powered applications
• Integrated 1.182V reference output capable of driving bypass capacitors
• Programmable hysteresis using external resistors connected to the HYST pin
• Glitch-free CMOS output stage eliminates crowbar switching currents

Applications

• Battery-powered system monitoring
• Threshold detectors
• Window comparators
• Oscillator circuits

Procurement Notes

Verify the specific C-grade temperature range (0°C to 70°C) matches the design requirements. Confirm the 8-lead DFN footprint dimensions align with the PCB layout. Ensure supply voltage stays within the 2V to 11V operational limits to maintain specified electrical characteristics.

Selection Notes

Select this component when space is limited due to its compact 3mm × 3mm DFN package. Choose it for low-power designs requiring a built-in reference to reduce external component count. Consider the 40mA output drive capability if direct interfacing with loads is needed without additional buffering.

Part Context

This part belongs to the LTC1540 family of nanopower comparators. It is pin-compatible with devices like the LTC1440 and MAX921/MAX931, facilitating direct upgrades or replacements in existing designs. The CDD suffix specifically denotes the commercial grade temperature range and the DFN package style.

Replacement Considerations

LTC1540CS8#PBF offers the same electrical specifications in an 8-Lead Plastic SO package.