LTC691CSW#PBF

Supervisors Overview

The LTC691CSW#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 threshold voltage of 4.65 V. The device provides a CMOS output with a reset delay time of 50 ms. It includes power failure detection, battery backup switching, and watchdog timer functions. The component supports chip enable signals but lacks manual reset capabilities. It is housed in an SOIC-16 package and operates between -40°C and +85°C.

Supervisors Feature Summary

• Integrates complete power supply monitoring and battery control for microprocessor systems
• Includes watchdog timing and power failure warning capabilities
• Features precise internal voltage reference and comparator circuits

Supervisors Applications

• Microprocessor reset supervision
• Battery backup switching
• CMOS RAM write protection

Supervisors Procurement Notes

Verify the specific suffix #PBF confirms lead-free compliance and RoHS status against current manufacturer documentation. Confirm the CSW suffix corresponds to the SOIC-16 wide package variant. Ensure the operating temperature range meets system requirements. Cross-reference the datasheet revision date to validate parameter accuracy before integration into final designs.

Supervisors Selection Notes

Select this component when a single-input voltage supervisor with integrated watchdog and power failure detection is required. It is suitable for 5V logic systems needing reliable reset generation. Consider the CMOS output drive capability and the absence of manual reset if user intervention is needed. Verify that the 50 ms reset delay aligns with system startup timing constraints.

Supervisors Part Context

This part belongs to the LTC690 family of supervisory circuits, which also includes the LTC690, LTC694, and LTC695. These devices provide comprehensive power management functions including reset, backup, and watchdog timing. The family utilizes a precise internal voltage reference to monitor power supply lines and generate appropriate control signals during out-of-tolerance conditions.

Supervisors Replacement Considerations

The MAX691CWE+T is a documented substitute within the same functional category. Verify pin compatibility and electrical specifications such as threshold voltage and reset delay before substitution.