Analog Devices Inc./Maxim Integrated MAX6385XS29D6-T

Overview

MAX6385XS29D6-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit with factory-set 2.93V reset threshold, 560ms minimum VCC reset timeout, and integrated manual reset input (MR). It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in battery-powered microcontroller systems requiring reliable power-on reset and field-initiated recovery.

For engineers reviewing the MAX6385XS29D6-T datasheet, MAX6385XS29D6-T pinout, MAX6385XS29D6-T application, or MAX6385XS29D6-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), MR debounce capability, SC70-4 package compatibility, and guaranteed operation at VCC ≥ 1V without external support circuitry.

Technical Context

The MAX6385XS29D6-T implements a precision voltage comparator with internal 2.93V reference and an on-chip timer that enforces a minimum 560ms reset assertion after VCC rises above threshold. Its MR input features a 63kΩ internal pullup resistor and supports TTL/CMOS logic levels.

Unlike open-drain variants, this device uses an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC - eliminating need for external pullup resistors and simplifying interface with modern μP reset inputs requiring high-asserted signals.

Key Specifications

Pinout & Package

MAX6385XS29D6-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR29D6+T, MAX6385XS29D6-T eliminates external component count and reduces leakage risk; compared with TPS3123E18DBVR, it delivers 62.5% lower supply current and adds field-serviceable reset capability - critical for maintenance-intensive embedded deployments.

Availability

MAX6385XS29D6-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial controllers, automotive body control modules, and smart home edge nodes requiring stable component supply and long-term lifecycle assurance.

Supply support for MAX6385XS29D6-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, automotive, and computing applications.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for space- and energy-constrained microcontroller systems requiring guaranteed reset behavior across wide voltage and temperature ranges.

FAQ

What is the exact reset threshold voltage of the MAX6385XS29D6-T?

The MAX6385XS29D6-T has a factory-set reset threshold of 2.93V, with guaranteed accuracy of ±2.5% over the full operating temperature range of −40°C to +125°C. This value is fixed and cannot be adjusted externally. The "29" suffix in the part number explicitly denotes the 2.93V threshold per Maxim's ordering guide, and the device does not require external resistor networks to set this voltage.

Does the MAX6385XS29D6-T support manual reset functionality?

Yes, the MAX6385XS29D6-T includes a dedicated active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset, which remains asserted for the full 560ms timeout period after MR is released. This feature enables field-serviceable recovery without power cycling and eliminates the need for external pullup components in typical switch-to-ground implementations.

What package type and dimensions does the MAX6385XS29D6-T use?

The MAX6385XS29D6-T is packaged in a 4-pin SC70 (SOT-323) outline, designated as package code X4+1, with mechanical dimensions of 2.0mm × 2.1mm × 0.95mm. It is RoHS-compliant (+T suffix), has a thermal resistance θJA of 322.6°C/W on multilayer board, and follows JEDEC-standard land pattern 90-0187 - enabling direct replacement in existing SC70-4 footprints designed for compatible supervisory ICs.

Can the MAX6385XS29D6-T operate reliably when VCC drops below 1.8V?

Yes, the MAX6385XS29D6-T is fully specified to operate down to VCC = 1.0V, and its RESET output remains logically valid (active-high) throughout that range. At VCC = 1.0V, it still sources ≥80µA while maintaining VOH ≥ 0.8×VCC, ensuring robust interface with modern ultra-low-voltage MCUs. This capability is confirmed in the Electrical Characteristics table and is critical for brownout recovery in battery-depleted systems.

How does the reset timeout behavior differ between VCC dropout and manual reset events for the MAX6385XS29D6-T?

The MAX6385XS29D6-T applies the same 560ms minimum timeout period for both VCC-induced and MR-induced reset events. Unlike the MAX6390, which offers separate VCC and MR timeout values, the MAX6385XS29D6-T uses a single, fixed 560ms timer regardless of trigger source. This simplifies timing analysis in safety-critical firmware and ensures consistent reset hold duration whether initiated by supply sag or user action.