Analog Devices Inc./Maxim Integrated MAX6834HXRD0+T

Overview

MAX6834HXRD0+T from Maxim Integrated is an ultra-low-voltage open-drain active-low microprocessor reset circuit in SC70-3 package, designed to monitor +1.313V supply (H-suffix threshold), assert reset during brownout or power-down, and maintain reset for 30ms (D2 timeout) after VCC recovery. It operates down to VCC = 0.55V and consumes only 7.5µA typical supply current, making it suitable for battery-powered embedded controllers.

For engineers reviewing the MAX6834HXRD0+T datasheet, MAX6834HXRD0+T pinout, MAX6834HXRD0+T application, or MAX6834HXRD0+T equivalent, key selection criteria include its 1.313V factory-set reset threshold, 30ms reset timeout, open-drain RESET output requiring external pullup, guaranteed operation down to 0.55V VCC, and immunity to sub-100ns MR glitches.

Technical Context

The MAX6834HXRD0+T implements a precision voltage comparator with ±2.5% threshold accuracy over -40°C to +85°C, referenced to an internal 444mV bandgap. Its reset assertion logic responds to VCC falling below 1.313V with 60µs propagation delay and holds RESET low for a fixed 30ms timeout after VCC rises above threshold.

This device uses BiCMOS process technology (681 transistors), features no manual reset (MR) input, and lacks RESET-IN functionality-unlike MAX6838–MAX6840 variants. Its open-drain RESET output supports level-shifting across supply domains and interfaces directly with bidirectional µP reset pins using a single external pullup resistor.

Key Specifications

Pinout & Package

MAX6834HXRD0+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm height), RoHS-compliant with lead-free finish (+T suffix). 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 supervisor applications.

Compared with MAX6834HXRD0+T, MAX6834HXRD3+T offers extended reset duration without changing threshold or package, while TLV803E13DBZR trades higher timing flexibility and lower IQ for incompatible pinout and reduced temperature accuracy (±3% vs. ±2.5%).

Availability

MAX6834HXRD0+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial controllers, low-power wearable SoCs, automotive body control modules, and edge AI inference nodes requiring stable component supply across long production lifecycles.

Supply support for MAX6834HXRD0+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, sensing, connectivity, and security applications, acquired by Analog Devices in 2021.

The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor supervision in space- and power-constrained systems, targeting 1.2V–1.8V supply rails in portable and battery-operated equipment.

FAQ

What is the exact reset threshold voltage of the MAX6834HXRD0+T?

The MAX6834HXRD0+T has a factory-set reset threshold of 1.313V with ±2.5% accuracy over the full -40°C to +85°C temperature range. This value is fixed and unadjustable, corresponding to the 'H' suffix in the part number per the Threshold Suffix Guide. The threshold is referenced to an internal 444mV bandgap and does not require external components.

Does the MAX6834HXRD0+T include a manual reset (MR) input?

No, the MAX6834HXRD0+T does not feature a manual reset (MR) input. Unlike MAX6835/MAX6836/MAX6837 variants, this device is a dedicated voltage detector with only three pins: GND, RESET (open-drain), and VCC. Its function is strictly VCC-supply monitoring without user-initiated reset capability.

What is the required pullup resistor value for the open-drain RESET output of MAX6834HXRD0+T?

The MAX6834HXRD0+T does not specify a mandatory pullup resistor value. A typical 10kΩ to 100kΩ resistor is used depending on rise time requirements and bus loading. For a 3.3V pullup, 47kΩ ensures <10µA additional current while maintaining <1µs rise time into 10pF load. The RESET output can be pulled up to any voltage ≤6.0V, independent of VCC.

Can the MAX6834HXRD0+T operate with VCC below 1.2V?

Yes, the MAX6834HXRD0+T is fully specified to operate with VCC as low as 0.55V. Its reset comparator remains functional and asserts RESET reliably down to this voltage. However, the open-drain output's sink capability degrades as VCC falls - at 0.55V, it guarantees 15µA sink current with VOL ≤0.15V, sufficient to drive CMOS inputs.

Is the MAX6834HXRD0+T pin-compatible with older Maxim reset ICs like MAX809?

No, the MAX6834HXRD0+T is not pin-compatible with MAX809. While the datasheet notes "pin compatible with MAX803/MAX809/MAX810" for the broader MAX6832–MAX6840 family, that compatibility applies only to devices sharing identical pin count and function mapping - e.g., MAX6832 (3-pin, push-pull) matches MAX809. MAX6834HXRD0+T uses open-drain output on Pin 2, whereas MAX809 uses push-pull, requiring different PCB layout.