Analog Devices Inc./Maxim Integrated MAX6836FXSD0+T

Overview

MAX6836FXSD0+T from Maxim Integrated is a push-pull active-high voltage supervisor IC designed for ultra-low-voltage microprocessor reset monitoring in 1.2V–1.8V digital systems. It features a factory-set 1.050V reset threshold (±2.5% over temperature), 30ms reset timeout (D2 suffix), 7.5µA typical supply current, and operates from VCC = 0.75V to 3.6V. It is used in portable battery-powered equipment to ensure reliable power-on reset and brownout protection.

For engineers reviewing the MAX6836FXSD0+T datasheet, MAX6836FXSD0+T pinout, MAX6836FXSD0+T application, or MAX6836FXSD0+T equivalent, key selection criteria include active-high push-pull RESET output compatibility with µP reset inputs, guaranteed reset validity down to VCC = 0.75V, SC70-4 package footprint constraints, and manual reset debouncing capability.

Technical Context

The MAX6836FXSD0+T implements a precision bandgap-based voltage comparator with internal hysteresis (0.75% of VTH) to reject fast VCC transients. Its reset logic asserts RESET high when VCC falls below 1.050V or MR is pulled low, holding RESET high for a fixed 30ms timeout after VCC recovers or MR is released.

It integrates a 20kΩ internal MR pullup resistor and guarantees valid push-pull RESET output drive (VOH ≥ 0.8×VCC at ISOURCE = 10µA) down to VCC = 0.75V. The device uses BiCMOS process technology (681 transistors) and requires no external components for basic operation.

Key Specifications

Pinout & Package

MAX6836FXSD0+T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6836FXSD0+T, MAX6381XR29+T offers higher reset threshold and longer timeout for less aggressive brownout response, while TPS3123E10DBVR trades SC70 miniaturization for ultra-low ICC-making MAX6836FXSD0+T optimal for compact 1.2V core-supply supervision with balanced power and timing.

Availability

MAX6836FXSD0+T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, wearable electronics, and battery-powered IoT edge controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6836FXSD0+T 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 semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and interface applications.

The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor reset supervision in space- and power-constrained portable systems operating from 1.2V to 1.8V rails.

FAQ

What is the exact reset threshold voltage of MAX6836FXSD0+T and how stable is it over temperature?

The MAX6836FXSD0+T has a factory-set reset threshold of 1.050V 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 normalized threshold variation versus temperature is shown in Figure MAX6832-40 toc04, confirming stability within the specified tolerance band across the entire range.

Does MAX6836FXSD0+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6836FXSD0+T includes a debounced manual reset (MR) input with an internal 20kΩ pullup resistor to VCC. MR is active-low and requires a minimum pulse width of 2µs. Logic thresholds are VIH ≥ 0.7×VCC and VIL ≤ 0.3×VCC. The pin rejects glitches shorter than 100ns and can be driven directly by CMOS outputs or a momentary switch to ground without external components.

What is the guaranteed minimum VCC level at which MAX6836FXSD0+T maintains valid RESET output drive?

MAX6836FXSD0+T guarantees valid push-pull active-high RESET output drive down to VCC = 0.75V. Specifically, VOH ≥ 0.8×VCC is ensured at ISOURCE = 10µA when VCC ≥ 0.75V. Below this voltage, output drive is not guaranteed, making 0.75V the functional lower limit for reliable reset assertion in brownout scenarios.

Which timeout period is implemented in MAX6836FXSD0+T, and how is it selected?

MAX6836FXSD0+T implements the 30ms reset timeout period, indicated by the "D2" suffix in its full ordering code. This timeout is factory-programmed and fixed-no external components or configuration pins are required. The D2 option corresponds to a typical tRP of 30ms (min 20ms, max 40ms) after VCC rises above the 1.050V threshold or MR is released.

Is MAX6836FXSD0+T compatible with 1.2V core supplies, and what is its supply current at that voltage?

Yes, MAX6836FXSD0+T is explicitly designed for 1.2V–1.8V systems. At VCC = 1.2V and TA = +25°C, its typical supply current (ICC) is 7.5µA, with a maximum of 13µA over temperature. This ultra-low ICC enables continuous supervision in battery-powered applications where power budget is critical, such as wearables and remote sensors.