Analog Devices Inc./Maxim Integrated MAX6834GXRD2+T

Overview

MAX6834GXRD2+T from Maxim Integrated is an ultra-low-voltage, open-drain active-low µP reset circuit in SC70-3 package, designed to monitor +1.2V to +1.8V supplies and assert reset during brownout or power-down. It features a factory-set 1.110V reset threshold (±2.5% over temperature), 30ms reset timeout (D2 suffix), and 7.5µA typical supply current - enabling reliable power monitoring in space-constrained portable systems.

For engineers reviewing the MAX6834GXRD2+T datasheet, MAX6834GXRD2+T pinout, MAX6834GXRD2+T application, or MAX6834GXRD2+T equivalent, key selection criteria include open-drain RESET compatibility with bidirectional µP reset pins, guaranteed reset validity down to VCC = 0.55V, immunity to short negative VCC transients, and support for external pullup to voltages up to +6.0V.

Technical Context

The MAX6834GXRD2+T implements a precision voltage comparator with 444mV internal reference and hysteresis of 0.75% of VTH, enabling stable detection of VCC drops below its 1.110V threshold. Its open-drain output stage sinks up to 200µA at VCC ≥ 1.5V while maintaining VOL ≤ 0.2V, and exhibits <1.0µA leakage when deasserted.

Reset assertion occurs within 60µs of VCC falling below threshold, and the 30ms timeout period is fixed and temperature-stable (±10% over -40°C to +85°C). The device requires no external components for basic operation and ignores fast transients due to built-in noise immunity.

Key Specifications

Pinout & Package

MAX6834GXRD2+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for low-profile portable applications. Pin 1 is GND, Pin 2 is RESET (open-drain active-low), and Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6834GXRD2+T, MAX6381XR29+T lacks open-drain flexibility and targets higher supply rails, while TPS3123QDBVRQ1 trades compact SC70 size and precise 30ms timing for automotive qualification and longer reset hold - making MAX6834GXRD2+T optimal for space- and timing-constrained portable electronics.

Availability

MAX6834GXRD2+T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, wearable electronics, and battery-powered edge AI modules requiring stable component supply across extended production lifecycles.

Supply support for MAX6834GXRD2+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, designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications systems.

The MAX6832–MAX6840 family delivers ultra-low-voltage µP reset supervision for sub-1.8V digital systems, targeting portable, battery-operated, and energy-sensitive embedded platforms where size, power, and accuracy are critical.

FAQ

What is the exact reset threshold voltage of MAX6834GXRD2+T and how stable is it over temperature?

The MAX6834GXRD2+T has a factory-set reset threshold of 1.110V with ±2.5% accuracy over the full operating temperature range of -40°C to +85°C. This specification is guaranteed by design and 100% production tested at +25°C. The normalized threshold drift is less than ±0.5% across temperature, as confirmed in the Typical Operating Characteristics plot (Figure MAX6832-40 toc04), ensuring robust performance in portable equipment exposed to environmental extremes.

Does MAX6834GXRD2+T require an external pullup resistor on the RESET pin, and what value is recommended?

Yes, MAX6834GXRD2+T requires an external pullup resistor on the open-drain RESET pin because it cannot drive high actively. A 10kΩ to 100kΩ resistor pulled to a compatible voltage (0V to +6.0V) is recommended. For 1.2V systems, a 47kΩ pullup to VCC provides adequate rise time (<1µs) while limiting current to ~25µA; for level-shifting to 3.3V logic, a 10kΩ pullup ensures fast edge rates without exceeding the 200µA sink capability.

Can MAX6834GXRD2+T operate reliably when VCC drops below 1.0V, and down to what minimum voltage does reset remain valid?

Yes, MAX6834GXRD2+T guarantees valid reset assertion down to VCC = 0.55V - meaning the open-drain RESET output will continue sinking current and holding low until VCC falls below this level. Below 0.55V, the output enters high-impedance state. This behavior is explicitly characterized in the Absolute Maximum Ratings and Electrical Characteristics tables, making MAX6834GXRD2+T suitable for deep-brownout detection in ultra-low-power systems.

How does the 30ms reset timeout (D2 suffix) of MAX6834GXRD2+T compare to other timeout options in the family?

The D2 suffix in MAX6834GXRD2+T specifies a nominal 30ms reset active timeout period, which is the third-longest option in the MAX6832–MAX6840 family. It sits between D1 (1.5ms) and D3 (210ms), providing sufficient hold time for most ARM Cortex-M and RISC-V microcontrollers to complete power-on initialization and register setup without excessive delay. This value is fixed, temperature-stable (±10%), and does not require external timing components.

Is MAX6834GXRD2+T pin-compatible with legacy Maxim reset ICs such as the MAX809 or MAX6712?

No, MAX6834GXRD2+T is not pin-compatible with MAX809 or MAX6712. While the datasheet notes functional compatibility with those series, MAX6834GXRD2+T uses a 3-pin SC70-3 package with pinout GND–RESET–VCC, whereas MAX809 (SOT-23-3) uses VCC–GND–RESET and MAX6712 (SOT-23-5) has five pins. Direct replacement would require PCB layout revision; however, the electrical interface (open-drain RESET, same voltage ranges) simplifies system-level redesign.