MAX6336US18D3-T

Overview

The MAX6336US18D3-T is a microprocessor supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It monitors power supplies in 1.8V to 3.3V systems, asserting an active-low reset signal when VCC drops below the preset threshold or upon manual reset assertion. The device features a push/pull output and remains in the correct state for VCC down to 0.7V. Key parameters include a 2.5µA supply current, a 280ms typical reset timeout, and operation within a -40°C to +125°C temperature range. It is housed in a 4-pin SOT-143 package.

Feature Summary

• Provides precise monitoring of power supply voltages with a debounced manual-reset input
• Features a push/pull active-low RESET output capable of driving external loads directly
• Designed to ignore fast transients on VCC to prevent false resets
• Operates at ultra-low supply currents suitable for battery-powered applications

Applications

• Microprocessor (µP) supervisory circuits in digital systems
• Power supply monitoring for 1.8V to 3.3V logic levels
• Battery-operated devices requiring low quiescent current
• Space-critical embedded designs utilizing compact packaging

Procurement Notes

Verify the specific suffix D3 against official documentation to confirm the exact voltage threshold, as the MAX6336 series offers multiple factory-trimmable options. Confirm RoHS compliance status and check for obsolescence notices, as Maxim Integrated products may have limited availability or end-of-life statuses depending on the manufacturing date code. Ensure the SOT-143 footprint matches your PCB design constraints.

Selection Notes

Select this component when an active-low, push/pull output is required for direct interfacing with microprocessor reset pins. Choose the MAX6336 over the MAX6335 (active-high) or MAX6337 (open-drain) based on output stage requirements. Verify that the fixed threshold voltage corresponds to the target system's brown-out detection needs without requiring external adjustment components.

Part Context

This part belongs to the MAX6335/MAX6336/MAX6337 family of ultra-low-voltage, low-power uP reset circuits. These devices are designed to increase circuit reliability by eliminating external components and adjustments. The family shares identical functionality except for the output type and polarity, allowing designers to select the appropriate variant based on system interface requirements while maintaining consistent performance characteristics.

Replacement Considerations

Direct substitutes within the same family include MAX6335US18D3-T (active-high output) and MAX6337US18D3-T (open-drain output). Ensure the replacement maintains the same SOT-143-4 package and compatible threshold voltage. Cross-reference with other Maxim Integrated reset controllers if pinout compatibility is not strictly required.