Analog Devices Inc./Maxim Integrated MAX6327UR26-T

Overview

MAX6327UR26-T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when voltage falls below 2.63V, maintaining reset for ≥100ms after recovery; it operates from 1.2V to 5.5V over –40°C to +85°C and draws ≤1µA supply current, enabling reliable power-on reset in portable battery-powered systems.

For engineers reviewing the MAX6327UR26-T datasheet, MAX6327UR26-T pinout, MAX6327UR26-T application, or MAX6327UR26-T equivalent, this device serves as a precision, ultra-low-power reset supervisor for 2.5V/3.3V µP systems requiring guaranteed reset assertion down to 1.2V VCC, immunity to fast transients, and factory-trimmed threshold accuracy (±1.5% at +25°C, ±2.5% over temperature).

Technical Context

The MAX6327UR26-T implements a precision bandgap-based reset comparator with 2.63V factory-trimmed threshold, 6.3mV hysteresis, and 40ppm/°C tempco to ensure stable trip point across temperature. Its active-high push-pull output drives high during reset (≥0.8·VCC at ISOURCE = 500µA) and low when not asserted (≤0.4V at ISINK = 3.2mA), eliminating need for external pull-up resistors.

It features built-in transient immunity-rejecting negative-going VCC glitches up to 200µs at 100mV overdrive-and guarantees correct reset state down to 1.2V VCC. The internal timing circuit delivers a minimum 100ms power-up reset timeout, fully specified over industrial temperature range without external components.

Key Specifications

Pinout & Package

MAX6327UR26-T is housed in a 3-pin SOT23-3 package (package code U3-1, outline 21-0051), with 1.3mm × 2.9mm footprint and gull-wing leads compatible with standard reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6327UR26-T, MAX809TRD2-T requires board-level redesign for pull-up and active-low logic inversion, while TPS3808G12QDBVRQ1 adds qualification overhead and layout space without improving threshold accuracy or quiescent current - making MAX6327UR26-T optimal for cost-sensitive industrial and portable designs demanding precision and ultra-low power.

Availability

MAX6327UR26-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6327UR26-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 power, sensing, and interface applications, with emphasis on high-reliability, low-power solutions for industrial and portable markets.

The MAX6327UR26-T belongs to the MAX6326/MAX6327/MAX6328 family of ultra-low-power µP supervisors, engineered specifically to replace discrete reset circuits in space-constrained, battery-operated, and thermally demanding systems.

FAQ

What is the exact reset threshold voltage of MAX6327UR26-T and how tightly is it specified?

The MAX6327UR26-T has a factory-trimmed reset threshold of 2.63V, guaranteed within ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating range. This specification is confirmed in Table 1 of the datasheet and applies directly to the MAX6327UR26-T variant, ensuring consistent brownout detection across temperature without user calibration. The 6.3mV hysteresis further stabilizes behavior near the trip point.

Does MAX6327UR26-T require any external components to function as a reset supervisor?

No, the MAX6327UR26-T operates as a complete reset solution with no external components required. Its internal precision voltage reference, comparator, and timing circuit generate a guaranteed ≥100ms active-high reset pulse upon power-up or brownout. Unlike discrete solutions, it eliminates external RC networks, comparators, and pull-up resistors - reducing BOM count, PCB area, and qualification effort for the MAX6327UR26-T.

How does MAX6327UR26-T behave during fast VCC transients, and what is its immunity limit?

The MAX6327UR26-T is designed to ignore fast negative-going VCC transients: it will not assert reset for glitches shorter than ~200µs when the overdrive (VTH – VCC) is 100mV, as shown in Figure 4 of the datasheet. This transient immunity prevents false resets in electrically noisy environments such as motor control or automotive systems, and is a verified characteristic of the MAX6327UR26-T's internal comparator architecture.

What is the supply current consumption of MAX6327UR26-T across its operating voltage and temperature range?

The MAX6327UR26-T draws ≤1.0µA typical supply current at VCC = 3.0V and +25°C, with a maximum of 1.75µA at VCC = 5.5V. Over temperature (–40°C to +85°C), ICC remains ≤1.0µA for VCC ≥ 3.0V per Electrical Characteristics table. This ultra-low ICC is measured and guaranteed for the MAX6327UR26-T, enabling decade-long operation in coin-cell–powered devices.

Is MAX6327UR26-T pin-compatible with other members of the MAX632x family, and what are the key functional differences?

Yes, the MAX6327UR26-T shares identical SOT23-3 pinout (GND, RESET, VCC) with all MAX6326/MAX6327/MAX6328 variants. The sole functional difference is output polarity: MAX6327UR26-T provides active-high push-pull reset, whereas MAX6326UR26-T is active-low push-pull and MAX6328UR26-T is active-low open-drain. All share the same 2.63V threshold, 100ms timeout, and 1µA ICC - making MAX6327UR26-T drop-in replaceable where active-high logic is required.