Analog Devices Inc./Maxim Integrated MAX6834FXRD0-T

Overview

MAX6834FXRD0-T from Maxim Integrated is an ultra-low-voltage open-drain active-low microprocessor reset circuit in SC70-3 package, designed to monitor +1.05V supply rails with ±2.5% threshold accuracy over temperature and assert reset for 70µs after VCC rise or MR deassertion. It features 7.5µA typical supply current and guarantees valid reset output down to VCC = 0.55V, making it suitable for battery-powered portable systems requiring precise low-voltage supervision.

For engineers reviewing the MAX6834FXRD0-T datasheet, MAX6834FXRD0-T pinout, MAX6834FXRD0-T application, or MAX6834FXRD0-T equivalent, key selection criteria include its 1.05V factory-set reset threshold, 70µs timeout period (D0 suffix), open-drain RESET output requiring external pullup, immunity to short VCC transients, and compatibility with bidirectional µP reset pins in space-constrained SC70-3 layouts.

Technical Context

The MAX6834FXRD0-T implements a precision voltage comparator with 444mV internal reference and hysteresis of 0.75% of VTH, enabling stable detection of VCC drops below 1.05V. Its reset assertion logic is triggered solely by VCC falling below threshold-no RESET-IN or MR input is present in this variant, as confirmed by pin configuration and ordering table.

This device uses BiCMOS process technology (681 transistors) and operates across -40°C to +85°C with supply voltage range 0.55V to 3.6V. The open-drain output stage supports level-shifting applications, sinking up to 200µA at VCC ≥ 1.5V while maintaining VOL ≤ 0.2V, and exhibits <1.0µA leakage when reset is not asserted.

Key Specifications

Pinout & Package

MAX6834FXRD0-T is housed in a 3-pin SC70-3 package (1.25mm × 0.85mm, 0.65mm pitch) with exposed pad option not specified. Pin 1 is GND, Pin 2 is RESET (open-drain active-low), and Pin 3 is VCC - no MR or RESET-IN terminals are present, distinguishing it from 4-pin variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector and µP reset applications.

Compared with MAX6834FXRD0-T, MAX6381XR24-T offers simpler interface but lacks level-shifting capability and has 2857× longer timeout, while TPS3123E10DBVR reduces power consumption by 80% but sacrifices threshold accuracy (±3%) and increases PCB footprint by 40%.

Availability

MAX6834FXRD0-T is available at Aetrix Electronics and suitable for battery-powered wearables, low-voltage microcontroller supervision, portable medical sensors, ultra-compact IoT edge nodes, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6834FXRD0-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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and interface applications, now part of Analog Devices.

The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor reset and voltage detection in portable and battery-operated systems where space, power, and precision are critical constraints.

FAQ

What is the exact reset threshold voltage of MAX6834FXRD0-T and how is it specified?

The MAX6834FXRD0-T has a factory-set reset threshold of 1.050V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is defined in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix F, and applies specifically to the MAX6834 series with SC70-3 packaging. The threshold is internally trimmed and does not require external components.

Does MAX6834FXRD0-T include a manual reset (MR) input or RESET-IN pin?

No, MAX6834FXRD0-T does not include MR or RESET-IN functionality. As a 3-pin SC70-3 device in the MAX6834 subgroup, it monitors only the VCC supply and asserts reset based solely on VCC crossing the 1.050V threshold. Pin configuration confirms only GND, RESET, and VCC connections - no fourth pin is present for MR or RESET-IN.

What is the purpose of the 70µs timeout period in MAX6834FXRD0-T and where is it used?

The 70µs timeout period in MAX6834FXRD0-T is the minimum reset assertion duration after VCC rises above 1.050V, ensuring the microprocessor receives a clean, minimum-width reset pulse during fast power-up sequences. It is selected via the D0 suffix and is especially valuable in high-speed digital systems where excessive reset hold time would delay boot timing unnecessarily.

How should the open-drain RESET output of MAX6834FXRD0-T be terminated?

The open-drain RESET output of MAX6834FXRD0-T requires an external pullup resistor connected to a voltage rail - which may be the same VCC being monitored or a separate higher-voltage domain (up to +6.0V). Typical values range from 10kΩ to 100kΩ depending on rise-time requirements and bus loading; the device sinks up to 200µA while asserting reset at VCC ≥ 1.5V.

Is MAX6834FXRD0-T compatible with bidirectional microprocessor reset pins?

Yes, MAX6834FXRD0-T is explicitly designed for interoperability with bidirectional µP reset pins due to its open-drain active-low RESET output. As documented in Figure 4 of the datasheet, connecting the RESET pin directly to the µP's bidirectional reset I/O with a single pullup resistor allows either device to assert reset - a key advantage over push-pull alternatives.