Analog Devices Inc./Maxim Integrated MAX6834FXRD3-T

Overview

MAX6834FXRD3-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 210ms after VCC recovery or manual trigger. It operates down to VCC = 0.55V and consumes only 7.5µA typical supply current, making it suitable for battery-powered embedded controllers and low-power µP systems.

For engineers reviewing the MAX6834FXRD3-T datasheet, MAX6834FXRD3-T pinout, MAX6834FXRD3-T application, or MAX6834FXRD3-T equivalent, this device serves as a precision voltage detector and reset supervisor for 1.05V core supplies in portable instrumentation, wearables, and energy-harvesting nodes where guaranteed reset validity at ultra-low VCC and noise-immune brownout detection are critical.

Technical Context

The MAX6834FXRD3-T implements a precision bandgap-based voltage comparator with 444mV internal reference, comparing VCC directly against factory-trimmed 1.05V threshold (F suffix). Its open-drain RESET output requires an external pullup and supports level-shifting across supply domains, enabling interface with bidirectional µP reset pins or higher-voltage logic.

It features fixed 210ms reset timeout (D3 suffix), immunity to sub-100ns MR glitches, and robust rejection of negative VCC transients up to 200mV overdrive. The device guarantees valid reset assertion down to VCC = 0.55V and maintains ±2.5% threshold accuracy from –40°C to +85°C without external calibration.

Key Specifications

Pinout & Package

MAX6834FXRD3-T is housed in a 3-pin SC70-3 package (1.25mm × 0.8mm, 0.65mm pitch) with GND, RESET (open-drain), and VCC terminals. No thermal pad or exposed die attach; standard reflow profile applies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6834FXRD3-T, MAX6381XR24-T supports higher supply rails but cannot supervise 1.05V cores, while TPS3123E10DBVR offers lower current but sacrifices VCC operating margin and threshold precision-making MAX6834FXRD3-T optimal for 1.05V systems demanding robustness at deep brownout.

Availability

MAX6834FXRD3-T is available at Aetrix Electronics and suitable for wearable health sensors, industrial IoT edge nodes, low-power smart meters, and energy-harvesting remote controls requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6834FXRD3-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 reset supervision for sub-1.2V digital systems, addressing the need for reliable power sequencing and brownout protection in next-generation portable and energy-constrained electronics.

FAQ

What is the exact reset threshold voltage of MAX6834FXRD3-T and how is it trimmed?

The MAX6834FXRD3-T has a factory-trimmed reset threshold of 1.050V with ±2.5% accuracy over –40°C to +85°C. This value is set by laser trimming during wafer sort and verified per unit; the 'F' suffix in the part number explicitly denotes the 1.050V threshold option per Maxim's Threshold Suffix Guide. No external components or adjustments are needed to achieve this specification.

Does MAX6834FXRD3-T include a manual reset (MR) input?

No, MAX6834FXRD3-T does not feature a manual reset input. It belongs to the MAX6834/MAX6837/MAX6840 subgroup, which uses open-drain RESET output but omits MR functionality. Reset is triggered solely by VCC falling below 1.050V. For MR capability, consider MAX6835FXRD3-T (same threshold, 4-pin SC70-4, push-pull active-low, with debounced MR).

What pullup resistor value is recommended for the open-drain RESET output of MAX6834FXRD3-T?

Maxim recommends a 10kΩ to 100kΩ pullup resistor for the MAX6834FXRD3-T RESET output. A 47kΩ resistor to 1.8V is typical for 1.05V-core systems. Lower values improve rise time but increase static current; higher values reduce current but risk slow edges in noisy environments. The device sinks up to 200µA at VCC ≥ 1.5V with VOL ≤ 0.2V, ensuring clean logic LOW.

Can MAX6834FXRD3-T operate with VCC below 1.05V and still assert reset?

Yes, MAX6834FXRD3-T guarantees reset assertion down to VCC = 0.55V. When VCC drops below 1.05V, the internal comparator triggers RESET, and the open-drain output pulls LOW. Even at 0.55V, the device maintains functional reset behavior-critical for detecting deep brownouts before system collapse. Below 0.55V, reset is no longer guaranteed.

Is MAX6834FXRD3-T pin-compatible with older Maxim reset ICs like MAX809?

No, MAX6834FXRD3-T is not pin-compatible with MAX809. While both are 3-pin SC70 devices, MAX809 uses VCC-GND-RESET pinout (1-2-3), whereas MAX6834FXRD3-T uses GND-RESET-VCC (1-2-3). Swapping them would short VCC to GND. Pin compatibility exists only within the MAX6832–MAX6837 series (e.g., MAX6832FXRD3-T shares identical pinout) and with MAX6711/MAX6712/MAX6713 per datasheet claim.