LTC690IS8

Supervisors Overview

The LTC690IS8 is a microprocessor supervisory circuit manufactured by Linear Technology (now Analog Devices). It provides complete power supply monitoring and battery control functions for microprocessor reset, battery backup, CMOS RAM write protection, power failure warning, and watchdog timing. The device features a precise internal voltage reference and comparator circuit to monitor the power supply line. It guarantees reset assertion at VCC = 1V with a maximum supply current of 1.5mA. The part is available in SO-8 packaging.

Supervisors Feature Summary

• Guaranteed reset assertion at low voltage levels
• Fast onboard gating of RAM chip enable signals
• Adjustable or fixed power OK/reset time delay options
• Low standby current consumption

Supervisors Applications

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

Supervisors Procurement Notes

Verify the specific suffix against the manufacturer's datasheet to confirm the exact reset time delay configuration and package type. Ensure the component source is authorized to guarantee authenticity and traceability. Check for any lead-free or environmental compliance markings if required for your assembly process. Confirm that the operating temperature range meets your system requirements before finalizing the procurement order.

Supervisors Selection Notes

Select this component when a reliable supervisor is needed for single-channel power monitoring. Consider the reset time delay requirement; choose between fixed or adjustable delay variants based on system startup needs. Evaluate the supply current constraints, as this part offers low standby current suitable for battery-operated devices. Ensure the SO-8 package fits the PCB layout constraints compared to other available packages like PDIP.

Supervisors Part Context

The LTC690 family includes variants such as the LTC690C and LTC690S, offering different package options and reset delay configurations. These devices are designed to replace older supervisory circuits like the MAX690 family, providing superior thermal performance and lower external component counts. The family supports various microprocessor architectures requiring robust power management supervision.

Supervisors Replacement Considerations

The LTC690C is a direct pin-compatible replacement within the same family, offering similar functionality in a different package. Verify that the reset threshold voltage and time delay specifications match the original design requirements when substituting.