Analog Devices Inc./Maxim Integrated MAX6834VXRD0+T

Overview

MAX6834VXRD0+T from Maxim Integrated is an ultra-low-voltage, open-drain active-low microprocessor reset circuit in a 3-pin SC70 package, designed to monitor +1.575V supply rails with ±2.5% threshold accuracy over temperature, 7.5µA typical supply current, and a 70µs reset timeout period. It ensures reliable power-on reset and brownout protection for low-power embedded systems operating down to VCC = 0.55V.

For engineers reviewing the MAX6834VXRD0+T datasheet, MAX6834VXRD0+T pinout, MAX6834VXRD0+T application, or MAX6834VXRD0+T equivalent, key selection criteria include its open-drain RESET output requiring external pullup, factory-set 1.575V reset threshold (suffix "V"), SC70-3 footprint compatibility, and immunity to sub-100ns MR glitches - critical for portable and battery-powered µP supervision.

Technical Context

The MAX6834VXRD0+T implements a precision voltage comparator with 444mV internal reference, comparing VCC directly against a factory-trimmed threshold (1.575V) without external components. Its reset assertion is triggered solely by VCC falling below threshold - not RESET-IN - distinguishing it from MAX6838–MAX6840 variants.

It features a debounced manual reset input (MR) with 20kΩ internal pullup, 2µs minimum pulse width requirement, and 100ns glitch rejection. The open-drain RESET output sinks up to 200µA at VCC ≥ 1.5V with VOL ≤ 0.2V, enabling level-shifting across supply domains and direct interfacing with bidirectional µP reset pins.

Key Specifications

Pinout & Package

MAX6834VXRD0+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), compatible with standard SC70 land patterns and reflow profiles. 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 MAX6834VXRD0+T, MAX809TV29+T targets higher-voltage systems and lacks open-drain flexibility, while TPS3808G15DBVR trades simplicity and speed for configurability and precision - making MAX6834VXRD0+T optimal for fixed 1.575V supervision in ultra-compact, low-power designs.

Availability

MAX6834VXRD0+T is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, medical diagnostic handhelds, low-power IoT edge controllers, and portable instrumentation requiring stable component supply and RoHS-compliant packaging.

Supply support for MAX6834VXRD0+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX6832–MAX6840 family was engineered specifically for ultra-low-voltage µP reset supervision in battery-powered and portable electronics, emphasizing minimal quiescent current, small footprint, and robust noise immunity.

FAQ

What is the exact reset threshold voltage of MAX6834VXRD0+T and how is it specified?

The MAX6834VXRD0+T has a factory-set reset threshold of 1.575V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is defined in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix "V" devices and is trimmed during production to ensure consistency without external calibration.

Does MAX6834VXRD0+T require an external pullup resistor on the RESET pin, and why?

Yes, MAX6834VXRD0+T requires an external pullup resistor on the RESET pin because it features an open-drain active-low output. Without the pullup, RESET remains floating when deasserted. The pullup can connect to VCC or a higher voltage rail (up to +6.0V), enabling level-shifting and wired-OR reset bus configurations - a key design advantage over push-pull alternatives.

Can MAX6834VXRD0+T monitor supply voltages below 1.575V, such as 1.2V or 0.9V?

No, MAX6834VXRD0+T is factory-trimmed for a fixed 1.575V threshold and cannot monitor lower voltages. For sub-1.5V supervision, select MAX6838–MAX6840 variants with RESET-IN input (e.g., MAX6840XSD0+T), which accept external resistive dividers to set thresholds as low as 0.44V - but those are functionally distinct parts with different pinouts and operation.

What is the minimum VCC voltage at which MAX6834VXRD0+T guarantees valid RESET output behavior?

MAX6834VXRD0+T guarantees valid RESET output down to VCC = 0.55V. Below this, the internal circuitry cannot sink sufficient current to maintain a defined LOW state. For applications requiring RESET validity all the way to 0V, a 100kΩ pulldown resistor on the RESET line is recommended - as documented in the Applications Information section of the datasheet.

Is MAX6834VXRD0+T pin-compatible with other members of the MAX6832–MAX6840 family?

MAX6834VXRD0+T shares the same 3-pin SC70-3 pinout (GND, RESET, VCC) with MAX6832 and MAX6833, but differs functionally: MAX6832 has push-pull active-low RESET, MAX6833 has push-pull active-high RESET, and MAX6834VXRD0+T has open-drain active-low RESET. Swapping them requires verifying output drive type and pullup requirements in the target circuit.