Analog Devices Inc./Maxim Integrated MAX6328UR26

Overview

MAX6328UR26 from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit designed to monitor 2.63V power supplies and assert a reset signal during brownout, power-up, or power-down events. It delivers 1µA max supply current, 100ms minimum reset timeout, and operates across –40°C to +85°C. Used in portable battery-powered systems where supply stability and low quiescent current are critical.

For engineers reviewing the MAX6328UR26 datasheet, MAX6328UR26 pinout, MAX6328UR26 application, or MAX6328UR26 equivalent, this page provides verified functional identity, confirmed SOT23-3 package mapping, factory-trimmed 2.63V reset threshold, open-drain output behavior, and direct alternatives with documented electrical and interface differences.

Technical Context

The MAX6328UR26 implements a precision voltage comparator with hysteresis (9.5mV) and internal timing circuitry to guarantee ≥100ms reset assertion after VCC rises above 2.63V. Its reset comparator ignores transients ≤200µs at 100mV overdrive, enabling robust operation in noisy power environments.

It features a dedicated open-drain RESET output pin compatible with bidirectional µP reset pins (e.g., Motorola 68HC11), requiring only an external pull-up resistor for level translation or shared reset bus control. The device remains fully functional down to VCC = 1V, ensuring valid reset state during deep brownout.

Key Specifications

Pinout & Package

MAX6328UR26 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with gull-wing leads, 0.95mm pitch, and 1.3mm body width. Pin 1 = VCC, Pin 2 = RESET (open-drain), Pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TR26D3T and TPS3808G12QDBVRQ1, the MAX6328UR26 uniquely combines ultra-low 1µA current, fixed 2.63V accuracy, and open-drain flexibility-making it optimal for space-constrained, battery-critical designs requiring shared reset infrastructure.

Availability

MAX6328UR26 is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial IoT edge nodes, smart energy meters, and critical microcontroller power-monitoring applications requiring stable component supply and long-term lifecycle support.

Supply support for MAX6328UR26 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 industrial, automotive, communications, and computing markets.

The MAX6326/MAX6327/MAX6328 family was engineered specifically for ultra-low-power microprocessor supervision in battery-operated and space-constrained systems, emphasizing minimal ICC, factory-trimmed accuracy, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of MAX6328UR26?

The MAX6328UR26 has a factory-trimmed reset threshold of 2.63V, with ±1.5% tolerance at +25°C and guaranteed performance across –40°C to +85°C. This value is laser-trimmed during production and documented in Maxim's Selector Guide and Table 1 of the datasheet. The "R26" suffix explicitly denotes the 2.63V variant within the MAX6328 family.

Does MAX6328UR26 require an external pull-up resistor on its RESET pin?

Yes, MAX6328UR26 requires an external pull-up resistor on its open-drain RESET pin to define the logic-high level. Typical values range from 10kΩ to 100kΩ, pulled to the target logic voltage (e.g., 3.3V or 5V). This configuration enables wired-OR reset busing and compatibility with bidirectional µP reset pins-core functionality confirmed in the Applications Information section of the datasheet.

What is the minimum VCC voltage at which MAX6328UR26 guarantees correct reset state?

MAX6328UR26 guarantees correct reset assertion and deassertion behavior down to VCC = 1.0V, as stated in the General Description and Absolute Maximum Ratings sections. This ensures the device remains functional and predictable during deep brownout conditions-critical for fail-safe shutdown in portable and automotive systems.

Is MAX6328UR26 pin-compatible with MAX803/MAX809 series devices?

Yes, MAX6328UR26 is pin-compatible with MAX803/MAX809/MAX810 in SOT23-3 packaging, sharing identical pinout (VCC–RESET–GND) and footprint. However, output type differs: MAX6328UR26 uses open-drain RESET, while MAX809 variants use push-pull. Direct substitution requires verifying pull-up presence and system-level reset bus topology.

What package type and dimensions does MAX6328UR26 use?

MAX6328UR26 uses the SOT23-3 package (JEDEC MO-178AA), measuring 2.92mm × 1.3mm × 1.02mm with 0.95mm lead pitch. This is confirmed in the Package Information section and Pin Configuration diagram. The "U" in "UR26" denotes SOT23-3 packaging, distinct from "X"-suffixed SC70-3 variants.