Analog Devices Inc./Maxim Integrated MAX6384XS29D2+T

Overview

MAX6384XS29D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-low push-pull reset output, factory-set 2.93V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, and debounced manual reset input (MR). It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6384XS29D2+T datasheet, MAX6384XS29D2+T pinout, MAX6384XS29D2+T application, or MAX6384XS29D2+T equivalent, key selection criteria include reset threshold accuracy, MR input pullup resistance (63kΩ), SC70-4 package footprint, VCC reset timeout tolerance, and compatibility with dual-voltage systems requiring stable reset assertion during supply transients.

Technical Context

The MAX6384XS29D2+T implements a precision bandgap-based voltage comparator for VCC monitoring and an internal timer for deterministic reset timeout. Its MR input features internal 63kΩ pullup and 1µs minimum pulse width support, enabling direct connection to momentary switches without external debounce.

It uses BiCMOS process technology to achieve ±2.5% reset threshold accuracy across -40°C to +125°C and maintains guaranteed reset logic state validity down to VCC = 1V - critical for low-voltage microcontroller startup sequencing in energy-constrained embedded systems.

Key Specifications

Pinout & Package

MAX6384XS29D2+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 microprocessor reset applications.

Compared with MAX809TRD2+T, MAX6384XS29D2+T adds essential MR functionality in a 4-pin SC70; versus TPS3808G18DBVR, it offers integrated MR pullup and tighter reset threshold accuracy (±2.5% vs ±3%), simplifying layout and improving voltage-margin robustness in industrial designs.

Availability

MAX6384XS29D2+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial controllers, automotive body electronics, and dual-voltage microcontroller systems requiring stable component supply and long-term production continuity.

Supply support for MAX6384XS29D2+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 industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP supervisory circuits optimized for reliable reset generation in battery-operated and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6384XS29D2+T and how stable is it over temperature?

The MAX6384XS29D2+T has a factory-set nominal reset threshold of 2.93V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This stability is achieved using a precision bandgap reference and laser-trimmed resistive divider, ensuring consistent brownout detection without external calibration. The MAX6384XS29D2+T maintains this specification across all production lots and environmental conditions within its rated range.

Does MAX6384XS29D2+T require an external pullup resistor on the RESET output?

No, MAX6384XS29D2+T does not require an external pullup resistor on the RESET output because it features an active-low push-pull driver. The output actively drives low during reset assertion and actively drives high when deasserted, eliminating reliance on external components. This reduces BOM cost and PCB area versus open-drain alternatives. The MAX6384XS29D2+T's push-pull architecture ensures fast, controlled rise/fall times and full rail-to-rail voltage swing.

What is the function and electrical behavior of the MR pin on MAX6384XS29D2+T?

The MR (Manual Reset) pin on MAX6384XS29D2+T is an active-low input with an internal 63kΩ pullup resistor to VCC. Driving MR low forces immediate reset assertion, which persists for the full 20ms timeout after MR is released. The pin accepts TTL/CMOS logic levels and rejects glitches shorter than 1µs. No external components are needed for basic switch interfacing - a normally open momentary switch from MR to GND suffices. The MAX6384XS29D2+T guarantees correct MR sampling down to VCC = 1V.

Can MAX6384XS29D2+T operate reliably at VCC = 1.2V, and what happens to RESET output below that?

Yes, MAX6384XS29D2+T is guaranteed to assert and maintain a valid RESET output state down to VCC = 1.0V, so operation at 1.2V is fully supported. Below 1.0V, the internal circuitry may become undefined, and RESET logic state is no longer assured. For applications requiring valid reset signaling down to 0V, external pulldown resistors are recommended - though this technique applies only to push-pull outputs like those on MAX6384XS29D2+T, not open-drain variants. The MAX6384XS29D2+T datasheet explicitly confirms functional operation at 1.0V.

Is MAX6384XS29D2+T pin-compatible with other devices in the MAX6381–MAX6390 family?

MAX6384XS29D2+T is pin-compatible with other 4-pin SC70 variants in the MAX6381–MAX6390 family (e.g., MAX6385XS29D2+T, MAX6386XS29D2+T), sharing identical VCC, RESET, MR, and GND pin assignments. However, it is not pin-compatible with 3-pin SC70 (e.g., MAX809) or 6-pin μDFN packages. Functionally, it matches MAX6384 variants with same suffixes (XS29D2), differing only in reset threshold and timeout - confirming mechanical and electrical interoperability within the XS-series 4-pin SC70 footprint. The MAX6384XS29D2+T pinout is fixed and documented in the official Maxim datasheet Figure 9.