Analog Devices Inc./Maxim Integrated MAX6835VXSD1+

Overview

The MAX6835VXSD1+ from Maxim Integrated is a precision ultra-low-voltage microprocessor supervisory circuit in SC70-4 package, featuring push-pull active-low reset output, 1.575V factory-set reset threshold (suffix V), and 1.5ms reset timeout period (suffix D1). It monitors +1.2V to +1.8V supplies, asserts reset during brownout or manual reset, and guarantees valid reset down to VCC = 0.55V. Designed for portable battery-powered µP systems requiring high reliability and minimal external components.

For engineers reviewing the MAX6835VXSD1+ datasheet, MAX6835VXSD1+ pinout, MAX6835VXSD1+ application, or MAX6835VXSD1+ equivalent, key selection considerations include its 1.575V threshold accuracy (±2.5%), 7.5µA supply current, debounced MR input, SC70-4 footprint, and compatibility with low-voltage core logic in embedded controllers and intelligent instruments.

Technical Context

This device implements a precision bandgap-based voltage comparator with hysteresis (0.75% of VTH) and a fixed 1.5ms timeout monostable circuit. The internal 20kΩ MR pullup enables direct switch interface without external biasing, and the reset comparator ignores transients <100ns on VCC.

It operates across full industrial temperature range (–40°C to +85°C) with supply voltage from 0.55V to 3.6V, and its push-pull RESET output sinks ≥15µA at VCC ≥ 0.55V while maintaining VOL ≤ 0.15V - ensuring robust drive into CMOS inputs even during deep brownout.

Key Specifications

Pinout & Package

MAX6835VXSD1+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable designs. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1+ and TPS3808G15DBVR, the MAX6835VXSD1+ delivers optimal balance of precision (±2.5% at 1.575V), ultra-low ICC (7.5µA), integrated MR debouncing, and minimal SC70-4 footprint - making it ideal for space- and power-constrained 1.6V core applications where fixed 1.5ms hold time suffices.

Availability

MAX6835VXSD1+ is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT edge nodes, and low-voltage microcontroller core monitoring requiring stable component supply and long-term manufacturability.

Supply support for MAX6835VXSD1+ 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 high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and consumer applications.

The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor supervision in portable and battery-critical systems, emphasizing sub-1µA quiescent current, SC70 packaging, and factory-trimmed thresholds for 1.2V–1.8V rails.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6835VXSD1+?

The MAX6835VXSD1+ has a factory-set reset threshold of 1.575V with ±2.5% accuracy over the full industrial temperature range (–40°C to +85°C), as specified in the Electrical Characteristics table for the 'V' suffix variant. This value is trimmed during production and does not require external calibration. The MAX6835VXSD1+ maintains this accuracy without user adjustment, making it suitable for 1.6V nominal core supplies where tight voltage margin control is essential.

Does MAX6835VXSD1+ support manual reset, and how is it implemented?

Yes, the MAX6835VXSD1+ features a debounced manual reset input (MR) on Pin 3. It includes an internal 20kΩ pullup resistor to VCC, so the pin can be left unconnected if unused. To assert reset, pull MR low with a momentary switch or logic signal; the device guarantees immunity to glitches <100ns and requires only a 2µs minimum pulse width. Reset remains active for the full 1.5ms timeout after MR is released, eliminating need for external RC debounce circuits.

What is the supply voltage range over which MAX6835VXSD1+ guarantees valid reset operation?

The MAX6835VXSD1+ guarantees valid reset output down to VCC = 0.55V for its active-low push-pull RESET pin (Pin 2), with VOL ≤ 0.15V when sinking 15µA. Below 0.55V, the output enters high-impedance state. Its operational supply range extends from 0.55V to 3.6V, and it correctly asserts reset whenever VCC falls below 1.575V within that range - critical for detecting brownout in deeply discharged battery scenarios.

Can MAX6835VXSD1+ be used with a 1.2V supply, and what is its typical supply current at that voltage?

Yes, the MAX6835VXSD1+ is explicitly rated for 1.2V nominal supply operation and is optimized for +1.2V to +1.8V systems. At VCC = 1.2V and TA = +25°C, its typical supply current is 7.5µA (with max 13µA over temperature), as confirmed in the Electrical Characteristics table. This ultra-low ICC enables multi-year operation in energy-harvesting or coin-cell-powered applications without compromising supervision reliability.

What package type and dimensions does MAX6835VXSD1+ use, and is it RoHS-compliant?

The MAX6835VXSD1+ uses a 4-pin SC70-4 package measuring 2.0mm × 2.1mm with 0.65mm lead pitch. It is offered in lead-free packaging, indicated by the '+' suffix in the part number per Maxim's ordering convention. The SC70-4 footprint provides significant space savings versus SOT-23 alternatives while maintaining compatibility with standard reflow soldering processes and hand-soldering accessibility.