Analog Devices Inc./Maxim Integrated MAX6836HXSD0+

Overview

The MAX6836HXSD0+ from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit designed to monitor +1.313V supply rails in ultra-low-voltage digital systems. It asserts RESET when VCC falls below 1.313V (±2.5% over temperature) or MR is pulled low, with a fixed 1.5ms timeout after recovery. Its 7.5µA typical supply current and SC70-4 package make it suitable for portable battery-powered controllers requiring reliable brownout protection.

For engineers reviewing the MAX6836HXSD0+ datasheet, MAX6836HXSD0+ pinout, MAX6836HXSD0+ application, or MAX6836HXSD0+ equivalent, key selection criteria include its active-high reset output, manual reset debouncing, 1.5ms timeout, ±2.5% threshold accuracy, and compatibility with 1.2V–1.8V core supplies in space-constrained embedded designs.

Technical Context

This device implements a precision voltage comparator with hysteresis (0.75% of VTH) and a fixed-delay monostable circuit to generate a clean, glitch-immune reset pulse. The internal 20kΩ MR pullup enables direct switch interfacing without external components.

It operates across –40°C to +85°C with guaranteed reset validity down to VCC = 0.75V (active-high), and features immunity to fast negative VCC transients ≤100ns at 20mV overdrive - critical for noisy power-rail environments.

Key Specifications

Pinout & Package

MAX6836HXSD0+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6836HXSD3+, the MAX6836HXSD0+ delivers faster release timing critical for rapid-boot µPs; versus TPS3123H50DBVR, it adds MR functionality and tighter threshold accuracy at the cost of slightly higher quiescent current - making it preferable for manually resettable, precision-brownout-sensitive systems.

Availability

MAX6836HXSD0+ is available at Aetrix Electronics and suitable for portable medical devices, industrial edge controllers, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6836HXSD0+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor supervision in battery-critical applications, emphasizing minimal supply current, SC70 packaging, and factory-trimmed thresholds for 1.2V–1.8V logic domains.

FAQ

What is the exact reset threshold voltage of the MAX6836HXSD0+ and how stable is it over temperature?

The MAX6836HXSD0+ has a factory-set reset threshold of 1.313V with ±2.5% accuracy over the full –40°C to +85°C operating range. This value is laser-trimmed during production and confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix 'H'. The device maintains this stability using on-chip bandgap references and hysteresis (0.75% of VTH) to prevent chatter near the trip point.

Does the MAX6836HXSD0+ require an external pullup resistor on its RESET pin?

No, the MAX6836HXSD0+ does not require an external pullup resistor because it features a push-pull active-high RESET output. The internal driver actively sources current (≥10µA at VCC ≥ 0.85V) when RESET is asserted and sinks current (≥150µA at VCC ≥ 1.5V) when unasserted - enabling direct connection to CMOS reset inputs without passive components.

What is the function of the MR pin on the MAX6836HXSD0+, and what happens if it is left unconnected?

The MR pin on the MAX6836HXSD0+ is an active-low manual reset input with an internal 20kΩ pullup resistor to VCC. If left unconnected, MR remains high and does not trigger reset. Pulling MR low for ≥2µs forces RESET high for the full 1.5ms timeout period, independent of VCC level - enabling hardware-initiated restarts for field service or test modes.

Can the MAX6836HXSD0+ operate reliably when VCC drops below 1.0V?

Yes, the MAX6836HXSD0+ guarantees valid active-high RESET operation down to VCC = 0.75V (per Absolute Maximum Ratings and Electrical Characteristics). Below 0.75V, reset assertion is no longer assured; however, the device continues drawing only 7.5µA typical current and retains full functionality above that floor - supporting graceful shutdown sequencing in deep brownout scenarios.

How does the MAX6836HXSD0+ handle short voltage transients on the VCC line?

The MAX6836HXSD0+ is immune to negative VCC transients ≤100ns wide when the overdrive (VTH – VCC) is ≤20mV, as verified in Figure 2 of the datasheet. This built-in noise rejection eliminates need for additional RC filtering on VCC, simplifying layout in EMI-prone environments such as motor-driven industrial equipment or automotive subsystems.