Analog Devices Inc./Maxim Integrated MAX6837VXSD0+T

Overview

MAX6837VXSD0+T from Maxim Integrated is an ultra-low-voltage, open-drain active-low microprocessor reset circuit in SC70-4 package, designed to monitor +1.575V supply rails with ±2.5% threshold accuracy over temperature. It features a 1.5ms reset timeout, debounced manual reset input (MR), and guaranteed reset validity down to VCC = 0.55V. Used in portable battery-powered systems for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6837VXSD0+T datasheet, MAX6837VXSD0+T pinout, MAX6837VXSD0+T application, or MAX6837VXSD0+T equivalent, key selection criteria include reset threshold tolerance, MR debounce capability, open-drain output compatibility with bidirectional µP reset pins, and low 7.5µA quiescent current for extended battery life.

Technical Context

The MAX6837VXSD0+T implements a precision voltage comparator with internal 444mV reference, comparing VCC against factory-trimmed threshold (1.575V) to assert RESET when supply drops below trip point. Reset remains asserted for a fixed 1.5ms timeout after VCC recovers above threshold or MR is released.

Its debounced MR input includes a 20kΩ internal pullup and rejects glitches <100ns; the open-drain RESET output requires an external pullup and supports level-shifting across supply domains. Immunity to short negative VCC transients is ensured by hysteresis and transient rejection circuitry.

Key Specifications

Pinout & Package

MAX6837VXSD0+T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable designs. The package is RoHS-compliant and tape-and-reel packaged for automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6835VXSD0+T, MAX6837VXSD0+T trades push-pull simplicity for open-drain flexibility-enabling bidirectional reset arbitration and multi-rail coordination. Against TPS3123E15DBVR, it delivers tighter threshold accuracy, lower power, and critical MR support for field-serviceable devices.

Availability

MAX6837VXSD0+T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, wearable electronics, and battery-powered edge AI modules requiring stable component supply and long-term lifecycle assurance.

Supply support for MAX6837VXSD0+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 management, sensing, and interface applications.

MAX6837VXSD0+T belongs to the MAX6832–MAX6840 family of ultra-low-voltage reset supervisors, engineered specifically for reliable power monitoring in sub-1.8V portable and battery-operated systems.

FAQ

What is the exact reset threshold voltage of the MAX6837VXSD0+T?

The MAX6837VXSD0+T has a factory-trimmed reset threshold of 1.575V with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This value is confirmed in the Electrical Characteristics table of the official Maxim datasheet (Rev 2, 12/05), under the "Reset Threshold" parameter for suffix 'V'. The threshold is fixed and not adjustable.

Does the MAX6837VXSD0+T require an external pullup resistor on the RESET pin?

Yes, the MAX6837VXSD0+T features an open-drain active-low RESET output and requires an external pullup resistor to establish a valid HIGH logic level. The datasheet specifies that the pullup may connect to any voltage between 0V and 6V, enabling level-shifting across supply domains. Typical values range from 10kΩ to 100kΩ depending on rise-time and bus loading requirements.

What is the function of the MR pin on the MAX6837VXSD0+T?

The MR (Manual Reset) pin on the MAX6837VXSD0+T is an active-low, debounced input with a 20kΩ internal pullup to VCC. Pulling MR low forces a reset regardless of VCC level, and reset remains asserted for the full 1.5ms timeout after MR is released. Its built-in debounce eliminates the need for external RC filters when used with mechanical switches.

Can the MAX6837VXSD0+T operate reliably below 1.0V supply voltage?

Yes, the MAX6837VXSD0+T guarantees valid reset assertion down to VCC = 0.55V for active-low operation. The datasheet explicitly states "Guaranteed Reset Valid to VCC = 0.55V-Active-Low" and confirms functional operation across VCC = 0.55V to 3.6V. Below 0.55V, the internal circuitry ceases to drive RESET, but this is outside the specified operating range.

Is the MAX6837VXSD0+T pin-compatible with older Maxim reset ICs like the MAX809?

Yes, the MAX6837VXSD0+T is explicitly stated in the datasheet to be pin compatible with the MAX803/MAX809/MAX810, MAX6711–MAX6713, and MAX6381–MAX6390 series. However, note that MAX6837VXSD0+T uses SC70-4 packaging (4-pin), whereas MAX809 is in SOT-23-3; physical pin alignment applies only within same-package variants (e.g., SC70-4 equivalents), not cross-package.