Analog Devices Inc./Maxim Integrated MAX6327XR27-T

Overview

MAX6327XR27-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 drops below 2.70V, maintaining reset for ≥100ms after recovery. It operates from 1.2V to 5.5V, draws ≤1µA supply current, and is housed in a 3-pin SC70-3 package for space-constrained embedded power monitoring applications.

For engineers reviewing the MAX6327XR27-T datasheet, MAX6327XR27-T pinout, MAX6327XR27-T application, or MAX6327XR27-T equivalent, this device delivers precision 2.70V threshold supervision with ±2.5% temperature stability, ultra-low power consumption, and guaranteed correct state down to 1V - critical for battery-powered µP systems requiring reliable brownout detection and power-on reset timing.

Technical Context

The MAX6327XR27-T implements a factory-trimmed bandgap-based voltage comparator with 6.3mV hysteresis to reject fast transients on VCC. Its active-high push-pull RESET output sources ≥500µA at 0.8·VCC while asserted and sinks ≤0.4V at 1.2mA when deasserted, enabling direct interface with µP reset inputs without external pull-up resistors.

Designed for operation across –40°C to +85°C, it guarantees reset timeout of 100–280ms and exhibits 40ppm/°C reset threshold tempco. The device requires no external components and maintains functional integrity during VCC ramp rates up to 100V/µs.

Key Specifications

Pinout & Package

MAX6327XR27-T is packaged in a 3-pin SC70-3 (X3-2 outline), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (ordered as "+T" suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6327XR27-T, the MAX6327UR27-T offers identical supervision functionality in a physically larger SOT23-3 package, while the TPS3123QDBVRQ1 provides automotive qualification and open-drain output at the cost of 2.5× higher supply current and no push-pull drive capability.

Availability

MAX6327XR27-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6327XR27-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6326/MAX6327/MAX6328 family was designed specifically to replace discrete reset circuits in µP-based systems, delivering ultra-low-power, factory-trimmed voltage supervision in minimal 3-pin packages.

FAQ

What is the exact reset threshold voltage of MAX6327XR27-T and how stable is it over temperature?

The MAX6327XR27-T has a nominal reset threshold of 2.70V at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% over the full –40°C to +85°C operating range. Its 40ppm/°C tempco ensures total drift remains under ±15mV across temperature, making it suitable for precision 2.5V/3.3V system supervision where consistent trip points are critical to avoid premature or delayed reset assertion.

Does MAX6327XR27-T require any external components to function?

No, the MAX6327XR27-T requires no external components. Its internal bandgap reference, precision comparator, and push-pull output driver are fully integrated. Unlike discrete solutions needing resistors, capacitors, or Zener diodes, MAX6327XR27-T achieves complete reset supervision with only VCC, GND, and RESET connections - reducing BOM cost, PCB area, and design validation effort.

Can MAX6327XR27-T operate reliably during fast VCC transients or noise spikes?

Yes, the MAX6327XR27-T is designed to ignore fast negative-going VCC transients. Its reset comparator incorporates built-in immunity to glitches up to 200µs duration when VCC dips 200mV below threshold. This prevents spurious resets in electrically noisy environments such as motor drives or switching power supplies, ensuring only sustained undervoltage conditions trigger the 100ms reset timeout.

What is the maximum VCC slew rate MAX6327XR27-T can handle without malfunction?

The MAX6327XR27-T is rated for VCC slew rates up to 100V/µs, far exceeding typical power supply ramp rates. This specification ensures correct reset assertion during rapid power-up (e.g., hot-swap events) and power-down sequences, and guarantees proper operation even when interfaced with fast-switching DC/DC converters or poorly filtered input rails.

Is MAX6327XR27-T pin-compatible with other members of the MAX632x family?

Yes, all MAX6326/MAX6327/MAX6328 variants in SC70-3 (X-series) or SOT23-3 (U-series) packages share identical pinouts: Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC. The MAX6327XR27-T is therefore pin-compatible with MAX6326XR27-T and MAX6328XR27-T, differing only in output polarity (active-high push-pull vs. active-low push-pull vs. active-low open-drain), allowing flexible design reuse across reset logic architectures.