Analog Devices Inc./Maxim Integrated MAX6384XS23D3

Overview

The MAX6384XS23D3 from Maxim Integrated is a low-power microprocessor supervisory circuit with active-low push-pull reset output, factory-set 2.31V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and integrated debounced manual reset input (MR) with internal 63kΩ pullup. It monitors single-supply systems in portable battery-powered equipment and industrial controllers requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6384XS23D3 datasheet, MAX6384XS23D3 pinout, MAX6384XS23D3 application, or MAX6384XS23D3 equivalent, key selection criteria include its 2.31V threshold accuracy, 140ms reset timeout, MR input timing behavior, SC70-4 package footprint, and compatibility with 1.8V–5.0V supply rails in space-constrained embedded designs.

Technical Context

The MAX6384XS23D3 implements a precision bandgap-based voltage comparator for VCC monitoring, paired with a temperature-stable RC timer for deterministic 140ms reset assertion after VCC recovery. Its MR input features internal 63kΩ pullup and 1µs minimum pulse width acceptance, enabling direct connection to momentary switches without external debounce components.

Reset output is guaranteed valid down to VCC = 1.0V and exhibits ±60ppm/°C tempco on threshold voltage. The device uses BiCMOS process technology (647 transistors) and supports negative-going VCC transient immunity up to 35µs at 100mV overdrive, per typical operating characteristics.

Key Specifications

Pinout & Package

MAX6384XS23D3 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.3mm × 0.9mm, with gull-wing leads and exposed pad not present. Pin 1 is marked by a dot or beveled edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR23D3+, the MAX6384XS23D3 adds MR functionality in a 4-pin SC70, enabling field-service reset without layout changes; compared with TPS3808G125DBVR, it delivers push-pull drive and simpler integration at the cost of slightly relaxed threshold tolerance and higher ICC.

Availability

MAX6384XS23D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6384XS23D3 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 and mixed-signal ICs for industrial, automotive, communications, and computing applications, with emphasis on power efficiency and reliability.

The MAX6381–MAX6390 family was developed specifically for low-voltage, low-power microprocessor supervision in battery-operated and thermally demanding environments, prioritizing sub-µA quiescent current and wide-temperature threshold stability.

FAQ

What is the exact reset threshold voltage of the MAX6384XS23D3 and how tightly is it specified?

The MAX6384XS23D3 has a factory-set nominal reset threshold of 2.31V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during production and documented in the Reset Thresholds table of the datasheet under suffix "23". The actual measured threshold for any given unit falls between 2.25V and 2.37V at +25°C, and between 2.22V and 2.39V across temperature extremes.

Does the MAX6384XS23D3 require an external pullup resistor on its RESET output?

No, the MAX6384XS23D3 does not require an external pullup resistor because it features an active-low push-pull reset output. The internal output stage actively drives the RESET pin low during reset assertion and high when deasserted, eliminating dependency on external passive components. This differs from open-drain variants like MAX6383/MAX6386, which do require external pullups.

How does the manual reset (MR) input behave during power-up and what is its default state?

The MR input of the MAX6384XS23D3 is active-low with an internal 63kΩ pullup resistor to VCC, so its default (unasserted) state is logic high. When pulled low, it forces immediate reset assertion and maintains reset for the full 140ms timeout after release. During power-up, MR remains high until VCC reaches ~0.8×VCC, ensuring no spurious reset from slow-rising supply rails.

Can the MAX6384XS23D3 operate reliably at VCC = 1.2V, and what happens to the RESET output below that?

Yes, the MAX6384XS23D3 guarantees correct RESET output logic state down to VCC = 1.0V, so operation at 1.2V is fully supported. Below 1.0V, the internal circuitry may become indeterminate; however, the datasheet specifies that RESET remains asserted (low) as VCC declines through this region, providing fail-safe behavior. No external pulldown is needed since the output is push-pull.

What package variant does MAX6384XS23D3 use and are there footprint-compatible alternatives in the same family?

The MAX6384XS23D3 uses the 4-pin SC70 package (package code X4-1), with 1.0mm × 1.3mm body size and 0.65mm lead pitch. Within the MAX6381–MAX6390 family, all "XS" suffix parts (e.g., MAX6385XS23D3, MAX6386XS23D3) share identical SC70-4 footprints and pinout, enabling direct substitution for different reset thresholds or timeout values without PCB revision.