Analog Devices Inc./Maxim Integrated MAX6834IXRD3+

Overview

MAX6834IXRD3+ from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit in a 3-pin SC70 package, designed to monitor +1.2V to +1.8V supplies and assert an open-drain active-low reset signal during power-up, brownout, or manual reset events. It features a factory-set 1.388V reset threshold, ±2.5% accuracy over temperature, 210ms reset timeout, and 7.5µA typical supply current-ideal for portable equipment power sequencing.

For engineers reviewing the MAX6834IXRD3+ datasheet, MAX6834IXRD3+ pinout, MAX6834IXRD3+ application, or MAX6834IXRD3+ equivalent, key selection considerations include its open-drain RESET output requiring external pullup, immunity to short VCC transients, guaranteed reset validity down to VCC = 0.55V, and compatibility with bidirectional µP reset pins in low-power embedded systems.

Technical Context

The MAX6834IXRD3+ implements a precision voltage comparator with 444mV internal reference and hysteresis of 0.75% of VTH to reject noise and fast transients on VCC. Its reset logic asserts RESET low when VCC falls below 1.388V and holds it low for exactly 210ms after VCC rises above threshold.

It uses BiCMOS process technology (681 transistors), operates from -40°C to +85°C, and draws only 7.5µA at +25°C with VCC = 1.2V-enabling battery life extension in portable devices. The device does not monitor RESET-IN; it is part of the MAX6832–MAX6837 group using direct VCC monitoring.

Key Specifications

Pinout & Package

MAX6834IXRD3+ is housed in a 3-pin SC70 package (JEDEC MO-203AA), with pin 1 = GND, pin 2 = RESET (open-drain active-low), pin 3 = VCC. The small outline allows placement near µP power pins for minimal trace inductance and optimal noise rejection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6834IXRD3+, the HXRD3+ variant lowers the reset point by 75mV for tighter brownout detection on 1.35V supplies, while FXRD3+ shifts it down to 1.05V for ultra-low-voltage I/O domains-both retain identical timing, package, and open-drain drive but require voltage-specific system validation.

Availability

MAX6834IXRD3+ is available at Aetrix Electronics and suitable for portable medical devices, battery-powered wearables, and low-voltage microcontroller systems requiring stable component supply with lead-free compliance and tape-and-reel packaging.

Supply support for MAX6834IXRD3+ 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, communications, and consumer applications.

The MAX6832–MAX6840 product line delivers ultra-low-power, SC70-packaged supervisory circuits optimized for reliable reset generation in space- and energy-constrained portable and embedded systems operating from 1.2V to 1.8V rails.

FAQ

What is the exact reset threshold voltage of the MAX6834IXRD3+?

The MAX6834IXRD3+ has a factory-set reset threshold of 1.388V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is specified in the Electrical Characteristics table of the official Maxim datasheet and corresponds to the "I" suffix in the ordering code. It is calibrated at wafer test and does not require external adjustment.

Does the MAX6834IXRD3+ support manual reset functionality?

No, the MAX6834IXRD3+ does not include a manual reset (MR) input. It belongs to the MAX6832/MAX6834/MAX6838 group, which uses only VCC monitoring and lacks the MR pin found on 4-pin variants like MAX6835/MAX6836/MAX6837. Its reset is triggered solely by VCC falling below 1.388V or by external assertion via the open-drain RESET line.

What pullup resistor value is recommended for the MAX6834IXRD3+ open-drain RESET output?

A 10kΩ pullup resistor to VCC is commonly used for the MAX6834IXRD3+ RESET output, balancing fast rise time (<100ns) and low static current (<100nA at 1.5V). For level-shifting to higher voltages (e.g., 3.3V or 5V), values up to 100kΩ may be used, provided the µP's RESET input leakage and capacitive loading allow adequate rise time per system timing requirements.

Can the MAX6834IXRD3+ operate with supply voltages below 1.2V?

Yes-the MAX6834IXRD3+ is fully specified down to VCC = 0.55V and guarantees valid reset assertion (RESET low) at that level. However, its 1.388V threshold means it will assert reset long before reaching 0.55V; operation below 1.2V is relevant only for ensuring deterministic behavior during final power collapse, not for functional supervision of sub-1.2V rails.

Is the MAX6834IXRD3+ pin-compatible with older Maxim reset ICs like the MAX809?

Yes, the MAX6834IXRD3+ is explicitly stated as pin-compatible with the MAX803/MAX809/MAX810 series, as well as MAX6711–MAX6713 and MAX6381–MAX6390 families. All share the same 3-pin SC70 footprint and GND–RESET–VCC pinout, enabling drop-in replacement in existing designs-provided the reset threshold (1.388V) and open-drain output match system requirements.