Analog Devices Inc./Maxim Integrated MAX6835VXSD3+

Overview

The MAX6835VXSD3+ from Maxim Integrated is a precision ultra-low-voltage microprocessor supervisory circuit with push-pull active-low reset output, 1.575V factory-set reset threshold, and 210ms reset timeout period. It monitors +1.2V to +1.8V supplies in portable and embedded systems, asserting RESET when VCC falls below threshold or MR is pulled low, and maintaining assertion for the full timeout after recovery. Designed for critical µP power monitoring in battery-powered equipment.

For engineers reviewing the MAX6835VXSD3+ datasheet, MAX6835VXSD3+ pinout, MAX6835VXSD3+ application, or MAX6835VXSD3+ equivalent, key selection criteria include its SC70-4 package, debounced manual reset input (MR), ±2.5% threshold accuracy over temperature, guaranteed RESET validity down to VCC = 0.55V, and compatibility with low-noise, space-constrained designs requiring stable brownout detection.

Technical Context

This device implements a precision voltage comparator with hysteresis (0.75% of VTH) and a fixed 210ms timeout timer triggered by VCC drop or MR assertion. Its internal 20kΩ MR pullup enables direct switch interfacing without external components.

The push-pull active-low RESET output drives low with 0.15V max VOL at 15µA sink current and remains functional down to VCC = 0.55V, ensuring deterministic reset behavior during deep brownout conditions before system shutdown.

Key Specifications

Pinout & Package

MAX6835VXSD3+ is housed in a 4-pin SC70 package (1.25mm × 1.25mm, 0.5mm pitch), optimized for high-density portable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6835VXSD3+, MAX6381TTD3+ omits MR support but offers tighter timeout spec, while TPS3123E18DBVR shifts threshold upward and reduces IQ at the cost of 1.2V–1.6V compatibility-making MAX6835VXSD3+ the sole fit for 1.575V brownout detection with manual reset in SC70-4.

Availability

MAX6835VXSD3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, and smart meter subsystems requiring stable component supply with guaranteed long-term continuity.

Supply support for MAX6835VXSD3+ 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, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6832–MAX6840 family delivers ultra-low-voltage supervisory circuits targeting battery-powered and energy-harvesting systems where supply rails fall below 1.8V and space constraints demand SC70 packaging.

FAQ

What is the exact reset threshold voltage of the MAX6835VXSD3+ and how stable is it over temperature?

The MAX6835VXSD3+ has a factory-set reset threshold of 1.575V with ±2.5% accuracy over the full -40°C to +85°C operating range. This specification is guaranteed by design and confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix 'V'. The device uses curvature-corrected bandgap referencing to maintain stability, and typical normalized threshold variation is less than ±0.5% across temperature as shown in Figure MAX6832-40 toc04.

Does the MAX6835VXSD3+ include manual reset functionality, and how is it implemented?

Yes, the MAX6835VXSD3+ includes a debounced manual reset input (MR) on Pin 3. It features an internal 20kΩ pullup resistor to VCC, allowing direct connection of a normally open switch to ground. The device rejects glitches shorter than 100ns and requires only a 2µs minimum pulse width, eliminating the need for external RC filtering. This MR function is explicitly listed in the General Description and Pin Description sections for MAX6835.

What is the reset timeout period for the MAX6835VXSD3+, and how is it selected?

The MAX6835VXSD3+ has a fixed 210ms reset timeout period, indicated by the 'D3' suffix in its part number per Table 2 (Active Timeout Period Guide). This timeout begins when VCC rises above 1.575V or when MR is released, and holds RESET asserted for the full duration regardless of subsequent VCC fluctuations. No external components or configuration pins are required to set this value.

Can the MAX6835VXSD3+ operate reliably at very low supply voltages, and what is its minimum functional VCC?

Yes, the MAX6835VXSD3+ guarantees valid reset assertion down to VCC = 0.55V for its active-low push-pull RESET output, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 0.55V, the output becomes high-impedance-but since most µPs are nonfunctional below ~0.6V, this boundary aligns with system-level requirements. The device continues drawing only 7.5µA typical current at 0.55V.

Is the MAX6835VXSD3+ pin-compatible with legacy Maxim supervisors like the MAX809 or MAX6712?

Yes, the MAX6835VXSD3+ is explicitly stated to be pin compatible with the MAX803/MAX809/MAX810, MAX6711/MAX6712/MAX6713, and MAX6381–MAX6390 series. This compatibility applies to its SC70-4 footprint and pin assignments (GND, RESET, MR, VCC), enabling drop-in replacement in existing designs without PCB modification-provided the 1.575V threshold and 210ms timeout meet system requirements.