Analog Devices Inc./Maxim Integrated MAX6835FXSD0

Overview

MAX6835FXSD0 from Maxim Integrated is a micropower voltage supervisor IC designed to monitor +1.2V to +1.8V supply rails in low-voltage microprocessor systems. It features a factory-set 1.050V reset threshold, 70µs timeout (D0 suffix), push-pull active-low RESET output, and debounced manual reset input (MR). It ensures reliable power-on reset and brownout protection in portable battery-powered equipment.

For engineers reviewing the MAX6835FXSD0 datasheet, MAX6835FXSD0 pinout, MAX6835FXSD0 application, or MAX6835FXSD0 equivalent, key selection criteria include its 1.050V threshold accuracy (±2.5%), 7.5µA typical supply current, SC70-4 package footprint, and compatibility with 1.2V–1.8V core logic domains requiring deterministic reset assertion during VCC decay.

Technical Context

The MAX6835FXSD0 implements a precision bandgap-based voltage comparator with hysteresis (0.75% of VTH) to reject fast VCC transients. Its internal 20kΩ MR pullup enables direct switch-to-ground connection without external components, and reset assertion remains valid down to VCC = 0.55V for active-low push-pull operation.

This device belongs to the MAX6832–MAX6840 family of ultra-low-voltage supervisors optimized for sub-1.8V digital systems. Unlike open-drain variants, MAX6835FXSD0 drives RESET actively high/low without requiring external pullups, simplifying interface to CMOS inputs while maintaining immunity to short negative VCC glitches up to 100ns at 10mV overdrive.

Key Specifications

Pinout & Package

MAX6835FXSD0 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), compatible with high-density PCB layouts and reflow soldering. The package supports both leaded and lead-free assembly (suffix +T).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6835FXSD0, MAX6381XR24-T supports higher supply voltages but cannot supervise 1.2V rails, while TLV803EB29DBVR offers lower current but fails to meet the 1.050V threshold requirement-making MAX6835FXSD0 uniquely suited for precise 1.05V detection in compact SC70-4 layouts.

Availability

MAX6835FXSD0 is available at Aetrix Electronics and suitable for portable medical sensors, low-power IoT edge nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply with guaranteed long-term continuity.

Supply support for MAX6835FXSD0 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, automotive, and computing markets.

The MAX6832–MAX6840 product line delivers ultra-low-voltage supervisors targeting sub-1.8V microprocessor and FPGA core domains, emphasizing minimal quiescent current, tight threshold accuracy, and robust transient immunity in miniature SC70 packages.

FAQ

What is the exact reset threshold voltage of MAX6835FXSD0 and how is it specified?

The MAX6835FXSD0 has a factory-set reset threshold of 1.050V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix F, and applies directly to the MAX6835FXSD0 part number without adjustment or external components.

Does MAX6835FXSD0 support manual reset functionality, and how is it implemented?

Yes, MAX6835FXSD0 includes a debounced manual reset input (MR) with an internal 20kΩ pullup resistor to VCC. Pulling MR low for ≥2µs forces reset assertion, and the device holds RESET active for the full 70µs timeout after MR returns high. No external debounce circuitry is required, making it ideal for simple pushbutton interfaces.

What is the minimum VCC voltage at which MAX6835FXSD0 guarantees valid reset output behavior?

MAX6835FXSD0 guarantees valid active-low RESET output down to VCC = 0.55V - meaning it can sink ≥15µA while holding RESET ≤0.15V. Below 0.55V, the output becomes high-impedance. This specification is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections for the MAX6835FXSD0 variant.

Can MAX6835FXSD0 be used with supply voltages above 1.8V, and what are the limits?

Yes, MAX6835FXSD0 operates with VCC from +0.55V to +3.6V per Absolute Maximum Ratings. While its reset threshold is fixed at 1.050V, it remains functional as a supervisor for higher rails (e.g., 3.3V I/O domains) as long as the monitored voltage exceeds 1.050V - though design intent focuses on 1.2V–1.8V core supplies.

Is MAX6835FXSD0 pin-compatible with other devices in the MAX6832–MAX6840 family, and which ones share the same SC70-4 pinout?

Yes, MAX6835FXSD0 shares identical SC70-4 pinout and footprint with MAX6835VXSD0, MAX6835HXSD0, MAX6836FXSD0, MAX6837FXSD0, and all MAX6835/MAX6836/MAX6837 variants in the XSD package. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC - confirmed in the Pin Description section for MAX6835/MAX6837.