Analog Devices Inc./Maxim Integrated MAX6384XS22D3

Overview

MAX6384XS22D3 from Maxim Integrated is a low-power microprocessor supervisory circuit with active-low push-pull reset output, factory-set 2.19V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input (MR) with internal 63kΩ pullup. It monitors single supply voltage in battery-powered embedded controllers and portable instrumentation.

For engineers reviewing the MAX6384XS22D3 datasheet, MAX6384XS22D3 pinout, MAX6384XS22D3 application, or MAX6384XS22D3 equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to negative-going VCC transients ≤140µs at 200mV overdrive, 3µA supply current at 1.8V, and compatibility with SC70-4 footprint for space-constrained PCB layouts.

Technical Context

The MAX6384XS22D3 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.19V threshold. Its internal timer initiates a 140ms reset assertion window upon VCC drop below threshold or MR low pulse, with reset deassertion only after timeout completion.

It features a debounced MR input with 1µs minimum pulse width acceptance and 100ns glitch rejection, and guarantees correct reset logic state across full operating voltage range (1.0V–5.5V). The push-pull active-low RESET output drives directly without external pullup.

Key Specifications

Pinout & Package

MAX6384XS22D3 is housed in a 4-pin SC70 package (X4-1), measuring 1.5mm × 1.0mm × 0.8mm, with wettable flanks for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3, MAX6384XS22D3 adds MR functionality in same footprint family but increases pin count; versus TPS3808G12DBVR, it trades 0.04V threshold offset and higher ICC for integrated MR and push-pull drive-reducing BOM count and layout complexity in cost-sensitive industrial controls.

Availability

MAX6384XS22D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup systems, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6384XS22D3 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 demanding industrial, automotive, and computing applications, with emphasis on reliability, low power, and integration.

The MAX6381–MAX6390 family delivers single/dual low-voltage µP reset supervision with factory-trimmed thresholds, multiple timeout options, and MR/RESET_IN flexibility-targeting space- and power-constrained embedded systems needing deterministic power-on reset behavior.

FAQ

What is the exact reset threshold voltage of MAX6384XS22D3 and how stable is it over temperature?

The MAX6384XS22D3 has a factory-set reset threshold of 2.19V, specified with ±2.5% tolerance over the full operating temperature range of –40°C to +125°C. Its tempco is 60ppm/°C, meaning threshold drift is bounded and predictable-critical for applications like automotive body controllers where ambient extremes affect rail stability. This value is laser-trimmed during production and verified per datasheet Table "Reset Thresholds".

Does MAX6384XS22D3 require an external pullup resistor on the RESET pin?

No, MAX6384XS22D3 does not require an external pullup resistor on the RESET pin because it features an active-low push-pull output stage. Unlike open-drain variants (e.g., MAX6383), the MAX6384XS22D3 drives the RESET line high or low actively-ensuring fast, rail-to-rail transitions without external components. This simplifies layout and improves noise immunity in compact PCBs.

What is the minimum pulse width accepted on the MR input of MAX6384XS22D3?

The MR input of MAX6384XS22D3 accepts a minimum pulse width of 1µs, with built-in 100ns glitch rejection. This allows reliable triggering from mechanical pushbuttons (with inherent bounce) or digital logic without external filtering. The internal 63kΩ pullup ensures MR defaults high when floating, and the 1µs specification is guaranteed across –40°C to +125°C per Electrical Characteristics table.

Can MAX6384XS22D3 operate reliably when VCC drops below 1.8V?

Yes, MAX6384XS22D3 is fully functional down to VCC = 1.0V and guarantees correct RESET output logic state at that level. Its internal circuitry remains active and the reset comparator continues accurate threshold comparison-even at 1.0V-making it suitable for deep brownout scenarios in battery-depleted portable devices. Supply current at 1.0V is not specified, but reset assertion remains valid per datasheet Absolute Maximum Ratings and Detailed Description.

How does the 140ms reset timeout of MAX6384XS22D3 compare to other timing options in the MAX6381–MAX6390 family?

The 140ms reset timeout (denoted by suffix D3) is one of seven standard delays in the MAX6381–MAX6390 family, positioned between 20ms (D2) and 280ms (D5). It provides sufficient hold time for mid-speed microcontrollers (e.g., ARM Cortex-M0+) to complete power-rail stabilization and internal oscillator startup without excessive delay. This value is factory-programmed and non-adjustable-ensuring consistent behavior across all MAX6384XS22D3 units.