Analog Devices Inc./Maxim Integrated MAX6836HXSD0

Overview

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 drops 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 µP reset applications.

For engineers reviewing the MAX6836HXSD0 datasheet, MAX6836HXSD0 pinout, MAX6836HXSD0 application, or MAX6836HXSD0 equivalent, key selection criteria include its 1.313V factory-set threshold, 1.5ms active-high reset timeout, debounced manual reset input, guaranteed reset validity down to VCC = 0.75V, and compatibility with low-noise, space-constrained embedded power monitoring designs.

Technical Context

The MAX6836HXSD0 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +85°C, paired with a fixed 1.5ms internal timeout timer. Its reset logic asserts a high-level output on VCC brownout or MR assertion and holds RESET high for the full timeout period after VCC exceeds 1.313V or MR is released.

It features a debounced manual reset input (MR) with internal 20kΩ pullup, immunity to sub-100ns VCC transients, and push-pull output capable of sourcing 50µA at 0.8×VCC while sinking 80µA at 0.2×VCC - ensuring robust interfacing with modern low-voltage µP reset inputs.

Key Specifications

Pinout & Package

MAX6836HXSD0 is housed in a 4-pin SC70 package (1.25mm × 1.25mm, 0.5mm pitch), optimized for high-density portable designs. The package is RoHS-compliant and available in lead-free (+T) variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6836HXSD0, MAX6836HXRD0 saves board area but removes reset controllability, while MAX6381HXS24+T trades precise µP boot timing for FPGA-safe hold duration - neither offers the combined 1.313V accuracy, 1.5ms timing, and debounced MR of MAX6836HXSD0.

Availability

MAX6836HXSD0 is available at Aetrix Electronics and suitable for battery-powered wearables, industrial sensor nodes, and low-power edge AI modules requiring stable component supply and long-term lifecycle support.

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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications systems.

The MAX6832–MAX6840 family delivers ultra-low-voltage supervisory circuits targeting portable and energy-harvesting systems where 1.2V–1.8V core supplies demand accurate, low-quiescent-current reset protection.

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 specification is guaranteed by design and 100% production tested at +25°C. The threshold is derived from an internal bandgap reference, ensuring minimal drift across temperature and supply variations - critical for reliable operation in battery-powered devices experiencing wide ambient swings.

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 to pull RESET high during assertion and sinks current to pull it low when deasserted. This eliminates external components, reduces board area, and avoids timing uncertainty introduced by RC time constants - a key advantage over open-drain alternatives like the MAX6834 series.

What is the function of the MR pin on the MAX6836HXSD0, and what are its electrical requirements?

The MR pin on the MAX6836HXSD0 is a debounced active-low manual reset input with an internal 20kΩ pullup to VCC. It asserts reset when pulled to ≤0.3×VCC and requires a minimum pulse width of 2µs. The input rejects glitches shorter than 100ns and supports direct connection to CMOS logic or momentary switches - no external filtering is needed. This makes the MAX6836HXSD0 suitable for field-service reset, test-mode entry, or emergency shutdown functions.

Can the MAX6836HXSD0 operate reliably when VCC falls below 1.0V?

Yes, the MAX6836HXSD0 guarantees valid RESET output down to VCC = 0.75V for active-high operation. Below this, the output may become undefined. Its internal circuitry remains functional and continues monitoring VCC down to 0.55V, but the push-pull driver's sourcing capability degrades as VCC decreases. For applications requiring reset validity near 0V, a pullup resistor to a higher auxiliary supply is recommended - though this is not needed for standard µP boot sequencing where operation ceases well above 0.75V.

How does the 1.5ms reset timeout of the MAX6836HXSD0 compare to other options in the MAX6832–MAX6840 family?

The MAX6836HXSD0 uses the D1 suffix, corresponding to a nominal 1.5ms reset timeout - optimized for fast-boot µPs such as ARM Cortex-M0+/M3 and RISC-V cores. Other variants offer 70µs (D0, voltage detector mode), 30ms (D2), 210ms (D3), or 1.68s (D4). The 1.5ms value balances sufficient initialization time against unnecessary system delay, distinguishing MAX6836HXSD0 from longer-timing alternatives like MAX6836HXSD3 (210ms) used in FPGA configuration or complex SoC boot flows.