Analog Devices Inc./Maxim Integrated MAX6386XS17D3+T

Overview

MAX6386XS17D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 1.67V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input (MR) featuring internal 63kΩ pullup. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6386XS17D3+T datasheet, MAX6386XS17D3+T pinout, MAX6386XS17D3+T application, or MAX6386XS17D3+T equivalent, key selection criteria include its 1.67V threshold accuracy, 140ms reset timeout, MR input timing behavior, open-drain output compatibility with mixed-voltage logic, and SC70-4 package footprint constraints.

Technical Context

The device implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 1.67V threshold, with hysteresis and ±2.5% tolerance over full temperature range. An internal RC timer generates the 140ms minimum reset assertion period after VCC rises above threshold or MR release.

Its MR input accepts TTL/CMOS-compatible low pulses, asserts reset synchronously, and includes internal 63kΩ pullup - eliminating external biasing. The open-drain RESET output requires an external pullup and remains valid down to VCC = 1.0V, ensuring deterministic state during deep brownout.

Key Specifications

Pinout & Package

MAX6386XS17D3+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 MAX6386XS17D3+T, MAX6326XR17D3+T offers stronger drive but sacrifices MR flexibility, while TPS3123E17DBVR reduces current draw at the cost of timeout precision and manual control - making MAX6386XS17D3+T optimal for compact, MR-dependent, battery-critical designs.

Availability

MAX6386XS17D3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and intelligent instruments requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6386XS17D3+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 reset supervision for space- and energy-constrained microprocessor systems, emphasizing accuracy, reliability, and minimal external component count.

FAQ

What is the exact reset threshold voltage of MAX6386XS17D3+T and how stable is it over temperature?

The MAX6386XS17D3+T has a factory-set reset threshold of 1.67V with guaranteed ±2.5% tolerance over the full –40°C to +125°C operating range. Its tempco is 60ppm/°C, meaning threshold drift is less than 10mV across the entire temperature span - sufficient for robust 1.8V rail supervision without calibration.

Does MAX6386XS17D3+T require an external pullup resistor on the RESET pin?

Yes, MAX6386XS17D3+T features an open-drain active-low RESET output and requires an external pullup resistor to the target logic rail (e.g., 10kΩ to 3.3V). This enables level-shifting and wired-OR configurations. No pullup is needed on MR, as it includes a 63kΩ internal resistor to VCC.

What is the minimum VCC voltage at which MAX6386XS17D3+T guarantees correct RESET output logic state?

MAX6386XS17D3+T guarantees valid RESET output logic state down to VCC = 1.0V. Below this, the internal circuitry cannot maintain defined output levels. This ensures deterministic reset behavior during deep brownout events common in battery-powered systems approaching end-of-life.

How does the manual reset (MR) input behave on MAX6386XS17D3+T during and after activation?

When MR is pulled low, MAX6386XS17D3+T immediately asserts RESET. After MR is released, RESET remains asserted for the full 140ms timeout period. The internal 63kΩ pullup holds MR high when unconnected, and the input rejects glitches <1μs - enabling direct pushbutton use without external filtering.

Is MAX6386XS17D3+T pin-compatible with legacy Maxim reset ICs like MAX809?

Yes, MAX6386XS17D3+T is pin-compatible with MAX809/MAX810/MAX803 and other members of the MAX6326–MAX6348 series in the same 4-pin SC70 package. This allows drop-in replacement in existing designs, preserving PCB layout while upgrading to lower current (3μA vs. ~10μA) and tighter threshold accuracy (±2.5% vs. ±3.5%).