Analog Devices Inc./Maxim Integrated MAX6381XR17D3-T

Overview

MAX6381XR17D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 1.67V reset threshold, 140ms minimum V_CC reset timeout, active-low open-drain reset output, and guaranteed operation down to V_CC = 1.0V. It monitors single-supply rails in battery-powered instrumentation and embedded controllers where brownout immunity and ultra-low quiescent current (3µA at 1.8V) are critical.

For engineers reviewing the MAX6381XR17D3-T datasheet, MAX6381XR17D3-T pinout, MAX6381XR17D3-T application, or MAX6381XR17D3-T equivalent, key selection criteria include its precise ±2.5% reset threshold accuracy over –40°C to +125°C, negative-going V_CC transient immunity, SC70-3 package footprint, and compatibility with systems requiring valid reset assertion during deep undervoltage conditions.

Technical Context

The MAX6381XR17D3-T implements a precision bandgap-based voltage comparator with internal 1.67V reference and a monolithic RC timer for fixed 140ms reset timeout. Its open-drain RESET output requires an external pullup and remains asserted until V_CC exceeds 1.67V and sustains for ≥140ms, ensuring reliable μP initialization after power-up or brownout recovery.

No manual reset (MR) or auxiliary RESET IN inputs are integrated - this variant is optimized for simple single-rail monitoring without user-triggered or dual-voltage supervision. The device guarantees correct logic state on RESET down to V_CC = 1.0V, enabling robust reset signaling even during severe supply sag.

Key Specifications

Pinout & Package

MAX6381XR17D3-T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with exposed pad not connected internally. Pin 1 is RESET (active-low open-drain), Pin 2 is V_CC, and Pin 3 is GND. No NC or MR pins are present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G16DBVR, the MAX6381XR17D3-T offers the optimal balance of ultra-low ICC, precise 1.67V threshold, and open-drain flexibility - making it preferred for long-life portable devices requiring both efficiency and interface versatility.

Availability

MAX6381XR17D3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6381XR17D3-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 and mixed-signal ICs for industrial, automotive, and computing applications, with emphasis on power efficiency and reliability.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP reset supervision for space- and energy-constrained systems - specifically engineered for battery-powered instrumentation and harsh-environment embedded controls.

FAQ

What is the exact reset threshold voltage of MAX6381XR17D3-T?

The MAX6381XR17D3-T has a factory-set nominal reset threshold of 1.67V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "17" corresponds to V_TH(nom) = 1.67V, V_TH(min) = 1.62V, and V_TH(max) = 1.71V. The MAX6381XR17D3-T uses this fixed threshold without external adjustment.

Does MAX6381XR17D3-T include a manual reset input (MR)?

No, the MAX6381XR17D3-T does not feature a manual reset input. Per the Selector Guide and Pin Configurations, only MAX6384–MAX6386 and MAX6390 variants include MR functionality. The MAX6381XR17D3-T is a minimal-feature variant with only V_CC, GND, and open-drain RESET pins - intended for applications requiring automatic power-on reset without user intervention.

What is the reset timeout period for MAX6381XR17D3-T?

The MAX6381XR17D3-T provides a minimum reset timeout period of 140ms, as indicated by the "D3" suffix in its part number. This value is specified in the Reset Timeout Delay table and is guaranteed over temperature. The actual timeout may extend up to 280ms per electrical characteristics, but design timing must use the 140ms minimum to ensure μP initialization compliance.

Can MAX6381XR17D3-T operate with V_CC below 1.8V?

Yes, the MAX6381XR17D3-T is fully specified to operate down to V_CC = 1.0V, and its RESET output state remains guaranteed valid across this entire range. At 1.0V, the device continues to monitor and assert reset correctly - a key differentiator for applications experiencing deep brownout or capacitor discharge scenarios. This behavior is explicitly verified in the Absolute Maximum Ratings and Electrical Characteristics sections.

Is MAX6381XR17D3-T pin-compatible with other MAX638x variants?

The MAX6381XR17D3-T shares the same 3-pin SC70 package and pinout (RESET, V_CC, GND) with MAX6381/MAX6382/MAX6383 in SC70 format, but is not pin-compatible with 4-pin or 6-pin variants (e.g., MAX6384–MAX6390) due to differing pin counts and functions. Its pinout matches MAX809/MAX6326 family members, enabling direct PCB replacement where open-drain output and identical footprint are required.