Analog Devices Inc./Maxim Integrated MAX6834GXRD3+

Overview

MAX6834GXRD3+ from Maxim Integrated is an ultra-low-voltage, open-drain active-low µP reset circuit in SC70-3 package, designed to monitor +1.2V supply rails with factory-set 1.110V reset threshold and 210ms timeout period. It asserts RESET when VCC falls below threshold or during manual reset, and guarantees valid reset output down to VCC = 0.55V. Used in portable microcontroller systems for reliable power-on/brownout reset.

For engineers reviewing the MAX6834GXRD3+ datasheet, MAX6834GXRD3+ pinout, MAX6834GXRD3+ application, or MAX6834GXRD3+ equivalent, key selection criteria include open-drain reset compatibility with bidirectional µP reset pins, low 7.5µA supply current, ±2.5% threshold accuracy over temperature, and support for level-shifting across multiple supply domains.

Technical Context

The MAX6834GXRD3+ implements a precision voltage comparator with 444mV internal reference, comparing VCC against a factory-trimmed threshold (1.110V) to trigger reset assertion. Its open-drain RESET output requires an external pullup and supports interfacing with µPs having bidirectional reset I/O without additional logic.

It features immunity to short negative VCC transients (e.g., <100ns glitches at 100mV overdrive), fixed 210ms reset timeout after VCC recovery, and guaranteed operation from VCC = 0.55V to 3.6V. No manual reset (MR) or RESET-IN pins are present-this variant is VCC-monitored only, with no user-adjustable inputs.

Key Specifications

Pinout & Package

MAX6834GXRD3+ uses the 3-pin SC70-3 package (1.25mm × 0.85mm, 0.65mm pitch), with GND on pin 1, RESET (open-drain, active-low) on pin 2, and VCC on pin 3. No MR or RESET-IN pins are present-this is a dedicated VCC-monitoring variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3123QDBVRQ1, the MAX6834GXRD3+ uniquely combines 1.2V-system optimization (1.110V threshold), ultra-low 7.5µA current, and open-drain output in SC70-3-making it the optimal choice for space- and power-constrained portable electronics where precise low-voltage monitoring is required.

Availability

MAX6834GXRD3+ is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart meter MCU subsystems, and medical infusion pump controllers requiring stable component supply and long-term lifecycle support.

Supply support for MAX6834GXRD3+ 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, sensing, and interface applications, acquired by Analog Devices in 2021.

The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage µP supervision in battery-powered and energy-harvesting systems, emphasizing minimal quiescent current, tight threshold accuracy, and compact packaging.

FAQ

What is the exact reset threshold voltage of the MAX6834GXRD3+ and how is it trimmed?

The MAX6834GXRD3+ has a factory-set reset threshold of 1.110V with ±2.5% accuracy over -40°C to +85°C. This value is laser-trimmed during wafer test using Maxim's BiCMOS process to match the 'G' suffix in the part number, and is guaranteed by design-not just typical. The threshold remains stable across temperature and supply variations, eliminating need for external calibration. This precise 1.110V point ensures robust margin above 1.2V nominal supply while avoiding premature reset assertion.

Does the MAX6834GXRD3+ support manual reset (MR) or adjustable threshold (RESET-IN) functionality?

No, the MAX6834GXRD3+ does not include MR or RESET-IN pins. It is a dedicated VCC-monitoring variant in the SC70-3 package with only three terminals: VCC, GND, and open-drain RESET. The 'G' suffix denotes the 1.110V threshold, and 'D3' specifies the 210ms timeout-both factory-configured. For MR or RESET-IN capability, engineers must select a 4-pin variant like MAX6837GXSD3+ (MR-enabled) or MAX6840GXSD3+ (RESET-IN enabled), which use SC70-4 packaging.

What pullup resistor value is recommended for the open-drain RESET output of the MAX6834GXRD3+?

A 47kΩ pullup resistor to the target reset domain voltage (e.g., 3.3V or 1.8V) is recommended for the MAX6834GXRD3+ RESET pin. This value balances fast rise time (<1µs with 10pF load), low static current (<70nA at 3.3V), and noise immunity. Values between 10kΩ and 100kΩ are acceptable; lower values improve speed but increase current, while higher values risk slow edges in noisy environments. The MAX6834GXRD3+ can sink 200µA at 0.2V VOL, ensuring solid logic-low assertion even with this pullup.

Can the MAX6834GXRD3+ operate reliably when VCC drops below 1.0V, and what happens to RESET output behavior?

Yes, the MAX6834GXRD3+ guarantees valid reset operation down to VCC = 0.55V. Below 0.55V, the internal circuitry ceases sinking current, causing the open-drain RESET to float high (determined by the external pullup). However, since most 1.2V µPs are nonfunctional below ~0.6V, this behavior is acceptable. For applications requiring RESET to remain asserted to 0V, a 100kΩ pulldown resistor to GND on the RESET line ensures it stays low-per Maxim's Figure 3 recommendation. This is rarely needed in practice for standard µP interfaces.

Is the MAX6834GXRD3+ RoHS-compliant and lead-free, and what does the '+' suffix signify?

Yes, the '+' suffix in MAX6834GXRD3+ explicitly indicates lead-free, RoHS-compliant packaging per Maxim's ordering convention. The device uses matte-tin lead finish on SC70-3 contacts and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1). All units shipped by Aetrix Electronics are fully compliant with EU RoHS Directive 2011/65/EU and China RoHS II, with full material declarations available upon request. The '+' replaces the older '-T' suffix used for leaded versions, confirming environmental compliance without requiring special handling.