Analog Devices Inc./Maxim Integrated MAX6834GXRD1+

Overview

MAX6834GXRD1+ from Maxim Integrated is an ultra-low-voltage, open-drain active-low microprocessor reset circuit in SC70-3 package, designed to monitor +1.2V to +1.8V supplies and assert reset during brownout or power-down. It features a factory-set 1.110V reset threshold (G suffix), 30ms reset timeout (D2 suffix), ±2.5% threshold accuracy over temperature, and guaranteed reset validity down to VCC = 0.55V. It is used in portable battery-powered systems requiring reliable low-voltage supervision.

For engineers reviewing the MAX6834GXRD1+ datasheet, MAX6834GXRD1+ pinout, MAX6834GXRD1+ application, or MAX6834GXRD1+ equivalent, key selection criteria include open-drain output compatibility with bidirectional µP reset pins, 30ms timeout for stable power-up sequencing, 7.5µA supply current for extended battery life, and 1.110V threshold matching 1.2V core rails.

Technical Context

The MAX6834GXRD1+ implements a precision voltage comparator with 444mV internal reference and resistor-divider–based threshold scaling, enabling accurate monitoring of low-voltage rails. Its reset assertion logic responds to VCC falling below the 1.110V threshold and holds RESET low for exactly 30ms after VCC recovers - no external timing components required.

It uses BiCMOS process technology (681 transistors) to achieve 7.5µA typical supply current while maintaining immunity to short negative VCC transients (<100ns). The open-drain RESET output requires an external pullup and supports level-shifting across supply domains, enabling interface with µPs having bidirectional reset I/O.

Key Specifications

Pinout & Package

MAX6834GXRD1+ is housed in a 3-pin SC70 package (1.25mm × 0.85mm, 0.65mm pitch), optimized for space-constrained portable designs. 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 MAX6834GXRD1+, MAX6381XR24+T serves higher-voltage systems and lacks low-threshold capability, while TPS3123E12DBVR offers similar open-drain functionality but with less precise 1.2V threshold alignment and significantly longer timeout - making MAX6834GXRD1+ optimal for compact, battery-sensitive 1.2V designs requiring fast, accurate reset.

Availability

MAX6834GXRD1+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical µP power monitoring, and intelligent instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for MAX6834GXRD1+ 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 connectivity applications, now part of Analog Devices.

MAX6834GXRD1+ belongs to the MAX6832–MAX6840 family of ultra-low-voltage SC70 reset supervisors, engineered specifically for reliable power-on reset and brownout protection in sub-1.8V portable and battery-operated systems.

FAQ

What is the reset threshold voltage of the MAX6834GXRD1+?

The MAX6834GXRD1+ has a factory-set reset threshold of 1.110V, denoted by the 'G' suffix in its part number. This value is accurate to ±2.5% over the full -40°C to +85°C operating temperature range, making it ideal for monitoring 1.2V supply rails with built-in safety margin against voltage droop.

Does the MAX6834GXRD1+ require an external pullup resistor on the RESET pin?

Yes, the MAX6834GXRD1+ features an open-drain active-low RESET output and requires an external pullup resistor. A typical value is 10kΩ connected to VCC or a higher logic rail. This configuration enables level-shifting and wired-OR interfacing with bidirectional µP reset pins - a key design advantage of the MAX6834GXRD1+.

What is the reset timeout period for the MAX6834GXRD1+?

The MAX6834GXRD1+ provides a fixed 30ms reset timeout period, indicated by the 'D2' suffix. After VCC rises above the 1.110V threshold, the RESET signal remains asserted for exactly 30ms - ensuring sufficient hold time for microprocessor initialization, PLL locking, and memory stabilization before release.

Can the MAX6834GXRD1+ operate down to 0.55V VCC?

Yes, the MAX6834GXRD1+ guarantees valid reset assertion down to VCC = 0.55V for active-low operation. Below this voltage, the internal circuitry ceases to sink current reliably; however, the 0.55V lower limit ensures robust brownout detection well into battery end-of-life conditions - a critical feature for the MAX6834GXRD1+ in portable applications.

Is the MAX6834GXRD1+ pin-compatible with other devices in the MAX6832–MAX6840 family?

Yes, the MAX6834GXRD1+ shares identical SC70-3 pinout (GND, RESET, VCC) with all 3-pin variants in the MAX6832–MAX6840 family, including MAX6832 and MAX6833. This allows drop-in substitution within the same package format when adjusting threshold or output polarity - a documented compatibility confirmed in the MAX6832–MAX6840 datasheet.