Analog Devices Inc./Maxim Integrated MAX6386XS26D3+T

Overview

MAX6386XS26D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.63V 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 systems in battery-powered instrumentation and embedded controllers requiring reliable power-on reset under brownout conditions.

For engineers reviewing the MAX6386XS26D3+T datasheet, MAX6386XS26D3+T pinout, MAX6386XS26D3+T application, or MAX6386XS26D3+T equivalent, key selection criteria include its 2.63V threshold accuracy, 140ms timeout timing, MR input compatibility with TTL/CMOS logic, guaranteed reset validity down to VCC = 1V, and 4-pin SC70 package footprint.

Technical Context

The MAX6386XS26D3+T implements a precision bandgap-based voltage comparator for VCC monitoring and an internal monostable timer for fixed 140ms reset assertion after VCC recovery. Its MR input features built-in glitch rejection (100ns) and 1µs minimum pulse width requirement, enabling robust manual reset initiation without external debounce.

As part of the MAX6381–MAX6390 family, it shares BiCMOS process technology and thermal characteristics (θJA = 322.6°C/W on multilayer board), operates from 1.0V to 5.5V supply, and guarantees open-drain RESET output low voltage ≤0.3V at ISINK = 1.2mA (VCC ≥ 2.5V) and leakage <1.0µA when deasserted.

Key Specifications

Pinout & Package

MAX6386XS26D3+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 MAX6386XS26D3+T, MAX6326XR26D3+T simplifies BOM by eliminating the pullup resistor but removes MR capability, while TPS3123E18DBVR offers better threshold accuracy and lower VCC start-up voltage at the cost of higher current draw and no manual reset - making MAX6386XS26D3+T optimal for MR-dependent, ultra-low-power portable systems.

Availability

MAX6386XS26D3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for MAX6386XS26D3+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, emphasizing low power, high reliability, and small-footprint packaging.

The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for battery-powered and thermally demanding environments, with emphasis on factory-trimmed thresholds, sub-μA quiescent current, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of MAX6386XS26D3+T and how stable is it over temperature?

The MAX6386XS26D3+T has a nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This stability is achieved through factory laser trimming of on-chip resistors and bandgap reference design. The device's reset threshold tempco is specified at 60ppm/°C, ensuring minimal drift across thermal cycling in automotive and industrial deployments. MAX6386XS26D3+T maintains this accuracy without requiring external calibration components.

Does MAX6386XS26D3+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6386XS26D3+T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, MR must be driven below 0.3×VCC (for VTH < 4V) for a minimum pulse width of 1µs. The input rejects glitches shorter than 100ns and exhibits 200ns propagation delay from MR low-to-reset assertion. When unused, MR may be left floating or tied directly to VCC. MAX6386XS26D3+T guarantees correct MR operation across its full 1.0V–5.5V supply range.

What package type and dimensions does MAX6386XS26D3+T use, and is it RoHS-compliant?

MAX6386XS26D3+T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. The "+T" suffix confirms lead(Pb)-free and RoHS-compliant construction. Thermal resistance is θJA = 322.6°C/W on a multilayer PCB per JEDEC JESD51-7. This compact footprint supports high-density layouts in portable and automotive electronics where board area is constrained.

How does the open-drain RESET output of MAX6386XS26D3+T interface with different logic families?

The open-drain RESET output of MAX6386XS26D3+T requires an external pullup resistor to the target logic supply (e.g., 1.8V, 3.3V, or 5V). It sinks up to 1.2mA while asserted (VOL ≤ 0.3V at VCC ≥ 2.5V) and leaks <1.0µA when deasserted. This architecture enables level-shifting and wired-OR configurations - for example, multiple MAX6386XS26D3+T devices can share a single reset bus. MAX6386XS26D3+T's output remains valid down to VCC = 1V, though external pullup voltage must be within absolute maximum ratings (–0.3V to +6.0V).

Can MAX6386XS26D3+T monitor a second voltage rail, and if not, what alternatives exist in the same family?

No, MAX6386XS26D3+T monitors only the VCC rail and does not include a RESET IN input. That function is reserved for MAX6387/MAX6388/MAX6389 variants, which feature a dedicated auxiliary comparator referenced to +1.27V and support user-defined thresholds via external resistor dividers. For dual-rail monitoring with identical 2.63V threshold and 140ms timeout, MAX6387XS26D3+T is the direct family counterpart - it adds RESET IN while retaining MR and open-drain RESET, in the same 4-pin SC70 package.