Analog Devices Inc./Maxim Integrated MAX6326UR25

Overview

MAX6326UR25 from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.5V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 2.5V reset threshold (±1.5% at +25°C), 100ms minimum reset timeout, 1µA max supply current, and operates over –40°C to +85°C. It is used in portable battery-powered systems requiring reliable, low-quiescent-power supply monitoring.

For engineers reviewing the MAX6326UR25 datasheet, MAX6326UR25 pinout, MAX6326UR25 application, or MAX6326UR25 equivalent, this page provides verified technical context, pin-level design meaning, real-world use scenarios, and validated alternative options for µP reset supervision in space-constrained, low-power embedded designs.

Technical Context

The MAX6326UR25 integrates a precision voltage comparator with hysteresis (9.5mV typical) and an internal timer to guarantee ≥100ms reset assertion after VCC rises above 2.5V. Its reset comparator ignores fast transients-supporting immunity to VCC glitches up to 200µs at 100mV underdrive-enabling robust operation in noisy power environments.

It functions as a standalone reset generator with no external components required: VCC powers the device, GND provides reference, and the push-pull RESET output drives directly into µP reset inputs without pull-up resistors. The device remains fully functional down to VCC = 1V, ensuring valid reset state during deep brownout.

Key Specifications

Pinout & Package

MAX6326UR25 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), 2.92mm × 1.3mm × 1.0mm, with gull-wing leads and RoHS-compliant lead-free finish (marked "EYAA" per Table 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD25-T and TPS3808G01QDBVRQ1, the MAX6326UR25 delivers the lowest quiescent current, guaranteed transient immunity, and smallest PCB footprint-making it the preferred choice for portable, industrial, and cost-optimized µP reset supervision where fixed 100ms timeout and minimal external parts are critical.

Availability

MAX6326UR25 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6326UR25 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.

The MAX6326UR25 belongs to Maxim's ultra-low-power µP supervisory family, engineered specifically for battery-operated and space-constrained systems needing guaranteed reset behavior with zero external components and minimal current draw.

FAQ

What is the exact reset threshold voltage of MAX6326UR25 and how tightly is it specified?

The MAX6326UR25 has a factory-trimmed reset threshold of 2.5V, with a tolerance of ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating range. This specification is guaranteed-not typical-and applies directly to the MAX6326UR25 variant, as confirmed in Table 1 of the official datasheet. The threshold is set at wafer test and does not require external calibration.

Does MAX6326UR25 require any external components to function as a reset supervisor?

No, the MAX6326UR25 requires zero external components. Its push-pull RESET output drives directly into microprocessor reset inputs without needing a pull-up resistor. The internal voltage reference, comparator, and timer are fully integrated. This eliminates BOM cost, layout area, and calibration effort-making MAX6326UR25 a true single-chip reset solution for 2.5V systems.

What is the minimum VCC voltage at which MAX6326UR25 guarantees correct reset state assertion?

The MAX6326UR25 guarantees correct reset state (RESET asserted low) for all VCC values down to 1.0V. This is explicitly stated in the General Description and Absolute Maximum Ratings sections. Below 1.0V, operation is not defined-but at 1.0V, the device remains fully functional and will hold RESET low if VCC falls below 2.5V, ensuring safe µP shutdown during deep brownout.

How does MAX6326UR25 handle short voltage transients on the VCC line?

The MAX6326UR25 is designed to ignore fast negative-going VCC transients: it suppresses reset pulses for glitches up to 200µs wide when the underdrive (VTH – VCC) is 100mV, as shown in Figure MAX6326-04. This transient immunity is built into the comparator architecture and does not rely on external filtering-providing inherent robustness in electrically noisy environments like motor controls or switch-mode power supplies.

Is MAX6326UR25 pin-compatible with other members of the MAX6326/MAX6327/MAX6328 family?

Yes, MAX6326UR25 is pin-compatible with all variants in the MAX6326/MAX6327/MAX6328 series-including MAX6326UR22, MAX6326UR23, and MAX6326UR24-as they share identical SOT23-3 pinout (VCC, RESET, GND), same footprint, and identical electrical interface. Only the reset threshold differs between suffixes; all other timing, drive strength, and thermal specs are identical across the UR-series.