LTC691IN#PBF

Supervisors Overview

The LTC691IN#PBF is a microprocessor supervisory circuit manufactured by Analog Devices Inc. It operates within a supply voltage range of 4.75 V to 5.5 V and features a precise threshold voltage of 4.65 V with 2% accuracy. The device provides a CMOS output type and includes a watchdog timer and battery backup switch functionality. It incorporates a reset delay time of 50 ms and supports chip enable signals without manual reset capability. The component draws a working power supply current of 600 uA and dissipates up to 500 mW. It is housed in a PDIP-16 package for through-hole installation and functions reliably across an operating temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Provides complete power supply monitoring and battery control functions for microprocessor reset, battery backup, CMOS RAM write protection, power failure warning, and watchdog timing.
• Utilizes a precise internal voltage reference and comparator circuit to monitor the power supply line and trigger reset when out-of-tolerance conditions occur.

Supervisors Applications

• Microprocessor reset circuits
• Battery backup systems
• CMOS RAM write protection
• Power failure warning systems

Supervisors Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and tube packaging as per manufacturer standards. Confirm the PDIP-16 through-hole package matches your PCB footprint requirements. Ensure the 4.65 V threshold aligns with your system's voltage tolerance needs. Check for any regional distribution restrictions or limited availability status directly with authorized suppliers before finalizing procurement plans.

Supervisors Selection Notes

Select this component when a dedicated supervisory circuit with integrated watchdog and battery backup is required for 5V logic systems. The PDIP-16 package suits prototyping or applications where surface mount space is not constrained. Consider the 600 uA quiescent current if power efficiency during active monitoring is a priority. Verify that the CMOS output interface is compatible with the target microprocessor input requirements.

Supervisors Part Context

The LTC691 belongs to the LTC690 family of microprocessor supervisory circuits from Analog Devices. This family provides comprehensive power management monitoring solutions including reset generation, battery backup switching, and watchdog timing. The LTC691 specifically offers a fixed threshold voltage and CMOS output, distinguishing it from variants with open-drain outputs or different threshold options within the same series.

Supervisors Replacement Considerations

LTC690MJ8: Offers similar supervisory functions but features an open-drain output and an 8-CERDIP package instead of PDIP-16. LTC691IN: Identical electrical specifications and function; verify if the non-PBF suffix denotes leaded packaging which may require compatibility with RoHS regulations depending on application constraints.