Analog Devices Inc./Maxim Integrated MAX6327XR30-T

Overview

MAX6327XR30-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 3.00V (±1.5% at +25°C), holding reset active for ≥100ms after VCC recovers. It operates from 1.2V to 5.5V over –40°C to +85°C, draws ≤1.0µA supply current at 3V, and is housed in a 3-pin SC70-3 package. It is used in portable battery-powered µP systems requiring reliable power-on/brownout reset.

For engineers reviewing the MAX6327XR30-T datasheet, MAX6327XR30-T pinout, MAX6327XR30-T application, or MAX6327XR30-T equivalent, this page delivers verified electrical parameters, thermal behavior, reset timing accuracy, output drive capability, and factory-trimmed threshold validation - all specific to the R30 (3.00V) variant in SC70 packaging.

Technical Context

The MAX6327XR30-T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 6.3mV hysteresis, ensuring stable threshold behavior across temperature. Its active-high push-pull RESET output sources ≥500µA at 0.8·VCC while VCC ≥ 2.1V, enabling direct interface with µP reset inputs without external pull-ups.

It features transient immunity: negative-going VCC glitches up to 200µs (at 100mV overdrive) are ignored, preventing false resets. The device remains fully functional down to VCC = 1.2V and guarantees correct reset state even at 1.0V during power-down sequencing.

Key Specifications

Pinout & Package

MAX6327XR30-T is packaged in a 3-pin SC70-3 (X3-2 outline), footprint-compatible with SOT23-3 but with smaller 1.25mm × 0.8mm body and 0.65mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6327UR30-T, the XR30-T saves board area and suits miniaturized designs, while the TPS3123QDBVRQ1 adds automotive qualification at the cost of 2.5× higher supply current and reduced battery lifetime.

Availability

MAX6327XR30-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup systems, and automotive body control modules requiring stable component supply with guaranteed long-term continuity.

Supply support for MAX6327XR30-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.

The MAX6326/MAX6327/MAX6328 family was engineered specifically for space-constrained, battery-sensitive µP reset supervision - delivering factory-trimmed thresholds, sub-µA operation, and robust transient immunity in 3-pin SC70/SOT23 packages.

FAQ

What is the exact reset threshold voltage of MAX6327XR30-T and how tightly is it specified?

The MAX6327XR30-T has a nominal reset threshold of 3.00V, specified as ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating range. This tolerance is factory-trimmed and guaranteed per datasheet Electrical Characteristics table, with 40ppm/°C tempco ensuring predictable drift. The "R30" suffix explicitly denotes the 3.00V variant within the MAX6327 family.

Does MAX6327XR30-T require an external pull-up resistor on its RESET pin?

No, MAX6327XR30-T does not require an external pull-up resistor because it features an active-high push-pull output. The RESET pin actively drives high (≥0.8·VCC) when VCC is above threshold and low (<0.4V) when VCC is below threshold. This eliminates external components and simplifies µP interface design compared to open-drain alternatives like MAX6328XR30-T.

What is the minimum VCC voltage at which MAX6327XR30-T guarantees correct reset state assertion?

MAX6327XR30-T guarantees correct reset state (RESET = low) for VCC down to 1.2V over temperature, and remains functional - though not fully specified - down to 1.0V. This ensures reliable brownout detection during deep discharge of Li-ion or coin-cell supplies, a key requirement for portable equipment where supply collapse must trigger controlled shutdown before data loss.

How does MAX6327XR30-T handle fast transients on the VCC line?

MAX6327XR30-T incorporates internal transient immunity: it ignores negative-going VCC glitches shorter than ~200µs when the overdrive (VTH – VCC) is 100mV, as shown in Figure 4 of the datasheet. This prevents false resets caused by switching noise or coupling spikes, making it suitable for use alongside DC/DC converters or motor drivers without additional filtering.

Is MAX6327XR30-T pin-compatible with legacy Maxim reset supervisors like MAX809?

Yes, MAX6327XR30-T is pin-compatible with MAX809 (and MAX803/MAX810) in both SC70-3 and SOT23-3 packages, sharing identical 3-pin VCC–RESET–GND topology and compatible footprints. However, note that MAX809 has an active-low output, whereas MAX6327XR30-T is active-high - software or µP reset polarity configuration must be verified during substitution.