Analog Devices Inc./Maxim Integrated MAX6364PUT23+

Overview

MAX6364PUT23+ from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input, battery switchover, and active-low/open-drain reset output. It operates from +1.2V supply, features factory-preset 2.32V reset threshold, guarantees RESET/RESET validity down to 1.2V, and delivers 150ms minimum reset timeout - used in portable/battery-powered equipment for SRAM backup and brownout protection.

For engineers reviewing the MAX6364PUT23+ datasheet, MAX6364PUT23+ pinout, MAX6364PUT23+ application, or MAX6364PUT23+ equivalent, key selection criteria include its adjustable RESET IN comparator (1.235V reference), SOT23-6 package footprint, battery-on switchover hysteresis (40mV), VCC-to-OUT on-resistance (≤2.7Ω at 2.38V), and guaranteed operation across –40°C to +85°C.

Technical Context

The MAX6364PUT23+ implements a precision voltage-monitoring architecture with dual power-path control: VCC powers OUT above reset threshold; below threshold, an internal MOSFET connects BATT to OUT when VBATT exceeds VCC by ≥20mV. Its RESET IN pin compares external voltage against a 1.235V bandgap reference, enabling programmable secondary supply monitoring via resistor divider.

Reset assertion occurs on VCC falling below 2.32V, MR low (not applicable here), or RESET IN falling below 1.235V. The active-low open-drain RESET output remains asserted for ≥150ms after recovery, with propagation delay <280µs over temperature and glitch immunity of 100ns. Battery-backup mode draws ≤0.05µA standby current at +25°C.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1, outline 21-0058), RoHS-compliant, –40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6364PUT23+, MAX6364HUT23+ offers identical supervision functionality but reversed reset polarity - critical for compatibility with existing PCB layouts. TPS3808G12DBVR trades adjustable secondary monitoring for higher accuracy (0.5% threshold tolerance) and longer timeout, making it preferable in noise-prone industrial environments where extended reset duration prevents spurious reboots.

Availability

MAX6364PUT23+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, smart meter backup systems, and POS terminal power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6364PUT23+ 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 power, sensing, and connectivity applications, with emphasis on reliability and integration for space-constrained systems.

The MAX6361–MAX6364 family was engineered specifically for µP-based systems needing compact, low-power supervision with battery switchover - targeting portable, industrial, and metering applications where supply integrity and data retention are critical.

FAQ

What is the exact reset threshold voltage of the MAX6364PUT23+?

The MAX6364PUT23+ has a factory-preset reset threshold of 2.32V, with guaranteed tolerance of ±1.5% over the full –40°C to +85°C temperature range. This value is laser-trimmed during production and documented in the Electrical Characteristics table of the MAX6361–MAX6364 datasheet Rev 4. The threshold applies to VCC falling below this level, triggering the active-low RESET output.

Does the MAX6364PUT23+ support battery backup for SRAM, and how does switchover work?

Yes, the MAX6364PUT23+ supports battery backup for SRAM via its OUT pin. When VCC falls below the 2.32V reset threshold and VBATT exceeds VCC by at least 20mV, an internal MOSFET connects BATT to OUT. Switchover includes 40mV hysteresis to prevent oscillation. The device draws only ≤0.05µA from the battery in backup mode, preserving cell life in long-term deployments.

How is the RESET IN pin used on the MAX6364PUT23+, and what voltage triggers reset?

The RESET IN pin on the MAX6364PUT23+ is compared to an internal 1.235V reference. When the voltage at RESET IN falls below 1.235V (±5mV), reset is asserted. This allows external resistor dividers to monitor secondary supplies - for example, a 4.60V rail can be scaled using R1 = 273kΩ and R2 = 100kΩ. Input leakage is ≤±25nA, enabling high-impedance divider designs.

What are the absolute maximum ratings for VCC and BATT on the MAX6364PUT23+?

The MAX6364PUT23+ has absolute maximum ratings of –0.3V to +6V for VCC and BATT pins relative to GND. Exceeding these voltages may cause permanent damage. Continuous VCC supply current is rated at 250mA, while BATT continuous current is limited to 40mA. The device includes short-circuit protection on the OUT pin for up to 10 seconds.

Is the MAX6364PUT23+ pin-compatible with other members of the MAX6361–MAX6364 family?

Yes, all MAX6361–MAX6364 variants share identical SOT23-6 pinouts and footprints, including MAX6364PUT23+. Pin functions (RESET, GND, RESET IN, VCC, OUT, BATT) are consistent across the family. Differences lie only in reset threshold voltage, RESET output polarity (active-low vs. active-high), and presence of MR/WDI/BATT ON functions - none of which affect physical layout or soldering.