Analog Devices Inc./Maxim Integrated MAX6361PUT23+

Overview

MAX6361PUT23+ from Maxim Integrated is a low-power microprocessor supervisory circuit in SOT23-6 package, providing factory-preset 2.32V reset threshold, manual reset input (MR), and active-low open-drain RESET output. It operates from +1.2V supply, guarantees RESET validity down to 1.2V, and delivers 150ms minimum reset timeout-designed for reliable power-up/brownout reset in battery-backed SRAM systems.

For engineers reviewing the MAX6361PUT23+ datasheet, MAX6361PUT23+ pinout, MAX6361PUT23+ application, or MAX6361PUT23+ equivalent, key selection criteria include its 2.32V precision reset threshold, debounced MR input with internal 20kΩ pull-up, guaranteed 1.2V operation, 150ms reset timeout, and SOT23-6 footprint compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The MAX6361PUT23+ integrates a precision voltage monitor, debounced manual reset input with internal pull-up, and open-drain reset driver-all optimized for µP systems requiring deterministic reset assertion during VCC brownout or operator-initiated recovery. Its reset logic asserts when VCC falls below 2.32V (±1.5% over temperature) or MR is pulled low, holding RESET active for ≥150ms after VCC rises above threshold or MR releases.

It features battery switchover capability: when VCC drops below both the reset threshold and VBATT (by ≥20mV), OUT automatically connects to BATT to sustain SRAM backup power. The device draws only 10µA typical supply current at VCC = 2.8V and maintains <1µA battery standby current when VCC = 0V and VBATT = 2.8V.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1 outline, 2.0mm × 1.25mm × 0.95mm height), RoHS-compliant, lead-free (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361PUT23+, MAX6361HUT23+ simplifies reset drive with push-pull output but sacrifices bus-sharing flexibility, while TPS3808G125DBVR offers higher threshold accuracy and wider supply range but omits MR-making MAX6361PUT23+ optimal for cost-sensitive, battery-backed designs needing both precision brownout detection and operator reset capability.

Availability

MAX6361PUT23+ is available at Aetrix Electronics and suitable for industrial control systems, portable medical instruments, POS terminals, and SRAM battery backup circuits requiring stable component supply across extended product lifecycles.

Supply support for MAX6361PUT23+ 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 high-performance analog and mixed-signal ICs for power, sensing, and connectivity applications, with emphasis on reliability and integration.

The MAX6361–MAX6364 family was developed specifically for µP systems requiring compact, low-power supervision with battery switchover-targeting portable, industrial, and critical embedded applications where power integrity and data retention are essential.

FAQ

What is the exact reset threshold voltage of the MAX6361PUT23+?

The MAX6361PUT23+ has a factory-preset reset threshold of 2.32V, with ±1.5% tolerance over the full operating temperature range (–40°C to +85°C). This value is laser-trimmed during production and does not require external calibration. The threshold is specified under load conditions (IOUT ≤25mA) and remains stable across supply voltages from 1.2V to 5.5V. This precise 2.32V setting makes MAX6361PUT23+ ideal for monitoring +2.5V rails with margin.

Does the MAX6361PUT23+ support battery backup functionality, and how does it work?

Yes, the MAX6361PUT23+ supports automatic battery backup switchover. When VCC falls below both the 2.32V reset threshold and VBATT (by ≥20mV), the internal MOSFET connects BATT to OUT, sustaining power to downstream SRAM. The device draws only 0.02µA from the battery in standby (VBATT = 2.8V, VCC = 0V), enabling multi-year retention on standard lithium cells. MAX6361PUT23+ does not provide a BATT ON indicator signal-that feature is exclusive to the MAX6363 variant.

Can the MAX6361PUT23+ be used without a backup battery?

Yes, the MAX6361PUT23+ operates correctly without a backup battery. In this configuration, connect BATT to GND and tie VCC directly to OUT. The device continues to provide VCC brownout detection and MR-initiated reset, with RESET asserted whenever VCC drops below 2.32V or MR is pulled low. All timing specifications-including 150ms reset timeout and 1.2V minimum operation-remain fully valid. No modifications to the MAX6361PUT23+ circuitry are required for non-battery use.

What is the function of the MR pin on the MAX6361PUT23+, and does it require external components?

The MR (Manual Reset) pin on the MAX6361PUT23+ is a debounced, active-low input that forces RESET assertion when pulled below 0.3×VCC. It features an internal 20kΩ pull-up resistor to VCC, so connecting a normally-open momentary switch from MR to GND is sufficient-no external pull-up or RC network is needed. The MAX6361PUT23+ holds RESET active for ≥150ms after MR transitions high, ensuring reliable µP reset. This integrated design reduces BOM count and PCB area versus discrete reset-button solutions.

Is the MAX6361PUT23+ pin-compatible with other members of the MAX6361–MAX6364 family?

Yes, all MAX6361–MAX6364 variants-including MAX6361PUT23+-share identical SOT23-6 pinouts and footprints. Pins 1–6 (RESET, GND, MR, VCC, OUT, BATT) retain consistent functions across the family. However, functional differences exist: only MAX6361 includes MR, only MAX6362 includes WDI, only MAX6363 outputs BATT ON, and only MAX6364 accepts RESET IN. Therefore, while PCB layout is interchangeable, firmware and external circuitry must match the specific variant's feature set.