LTC690MJ8

Supervisors Overview

The LTC690MJ8 is a microprocessor supervisory circuit manufactured by Analog Devices Inc. It functions as a simple reset or power-on reset monitor with an open-drain or open-collector output that asserts low. The device monitors a single voltage channel with a threshold of 4.65V. It features a minimum reset timeout of 35ms and operates within a temperature range of -55°C to 125°C. The component is housed in an 8-CERDIP package with through-hole mounting.

Supervisors Feature Summary

• Provides complete power supply monitoring 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 for out-of-tolerance conditions.

Supervisors Applications

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

Supervisors Procurement Notes

Verify the specific suffix MJ8 corresponds to the military-grade ceramic DIP package when sourcing. Confirm the manufacturer is Analog Devices Inc. Ensure the datasheet specifies the 4.65V threshold and 35ms minimum timeout. Check for RoHS compliance status if required by the application environment. Validate the pinout against the 8-CERDIP specification.

Supervisors Selection Notes

Select this component when a high-reliability supervisory circuit is required for harsh environments due to its wide operating temperature range. Choose the LTC690MJ8 over plastic packages if hermetic sealing is necessary. Ensure the system voltage exceeds the 4.65V threshold for proper operation. Consider the open-drain output compatibility with the target logic levels.

Supervisors Part Context

The LTC690 family includes variants like the LTC690C and LTC690L, offering similar supervisory functions in different packages and temperature ranges. The MJ8 designation specifically indicates a military-grade version in a ceramic dual in-line package, distinguishing it from industrial or commercial plastic counterparts within the same product line.

Supervisors Replacement Considerations

Direct substitutes include other members of the LTC690 family such as the LTC690C or LTC690L, provided the package and temperature specifications align with the design requirements. Verify that any replacement maintains the 4.65V threshold and open-drain output configuration.

Supervisors FAQ

What is the reset output polarity of the LTC690MJ8?

The reset output is active low, utilizing an open-drain or open-collector configuration.

Does the LTC690MJ8 support multiple monitored voltage channels?

No, the LTC690MJ8 is designed to monitor a single voltage channel.