Analog Devices Inc./Maxim Integrated MAX6377XR27+T

Overview

MAX6377XR27+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed threshold of 2.700V ±2.5% over temperature, 500nA supply current at +25°C, and guaranteed operation down to VCC = 1V - used for precision brownout detection in battery-powered microcontroller reset circuits.

For engineers reviewing the MAX6377XR27+T datasheet, MAX6377XR27+T pinout, MAX6377XR27+T application, or MAX6377XR27+T equivalent, key selection considerations include its SC70-3 open-drain output configuration, 2.7V trip point accuracy, transient immunity up to 140µs (at 100mV overdrive), and compatibility with 1.2V–5.5V logic pull-up voltages.

Technical Context

The MAX6377XR27+T implements a precision bandgap reference and comparator with internally trimmed resistors to set a fixed 2.700V detection threshold. It asserts an active-low signal on the open-drain OUT pin when VCC falls below this threshold, requiring an external pull-up resistor.

Designed for immunity to fast VCC transients, it suppresses output pulses for negative-going glitches ≤140µs (at 100mV overdrive) and operates across -40°C to +85°C with ±2.5% threshold accuracy and 40ppm/°C tempco - all without external components.

Key Specifications

Pinout & Package

MAX6377XR27+T is housed in a 3-pin SC70-3 package (2.0mm × 1.25mm × 0.95mm), optimized for space-constrained portable designs. Pin 1 = GND, Pin 2 = OUT (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with TLV803EC27DBVR and APX803S-27SA-7, the MAX6377XR27+T uniquely combines industrial temperature range, 500nA current, open-drain flexibility, and documented transient immunity - making it optimal for battery-critical, ruggedized embedded systems.

Availability

MAX6377XR27+T is available at Aetrix Electronics and suitable for portable medical sensors, wearables with Li+ battery, industrial IoT edge nodes, and smart meter backup power requiring stable component supply and long-term lifecycle support.

Supply support for MAX6377XR27+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, automotive, and communications markets.

The MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in battery-critical systems - delivering precision threshold detection with zero external components and guaranteed operation down to 1V.

FAQ

What is the exact reset threshold voltage of the MAX6377XR27+T and how accurate is it over temperature?

The MAX6377XR27+T has a factory-trimmed nominal reset threshold of 2.700V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (−40°C to +85°C). This is confirmed in Table 1 of the datasheet, where suffix "R27" corresponds to 2.700V typ, 2.633V min, and 2.768V max at temperature extremes. The MAX6377XR27+T achieves this without external calibration components.

Does the MAX6377XR27+T require an external pull-up resistor, and if so, what value is recommended?

Yes, the MAX6377XR27+T features an open-drain active-low output (OUT), requiring an external pull-up resistor to establish a valid logic-high level when not asserted. Recommended values range from 10kΩ to 100kΩ, selected based on rise-time requirements and sink current capability (100µA min, 1.6mA max per datasheet). The MAX6377XR27+T can interface with pull-up voltages from 1.2V to 5.5V.

What is the maximum VCC transient duration that the MAX6377XR27+T will ignore without asserting output?

The MAX6377XR27+T ignores negative-going VCC transients up to 140µs in duration when the overdrive (VTH − VCC) is 100mV, as shown in Figure MAX6375-04 of the datasheet. This transient immunity increases as overdrive decreases and is a key design feature to prevent false resets in electrically noisy environments - a verified characteristic of the MAX6377XR27+T.

Can the MAX6377XR27+T operate reliably at VCC = 1.2V, and what is its output behavior below that?

Yes, the MAX6377XR27+T is fully specified and guaranteed to produce correct output logic states for VCC down to 1.0V. At VCC = 1.2V, it remains functional: OUT stays high (high-impedance) if VCC ≥ 2.700V, and pulls low if VCC falls below threshold. Below 1.0V, behavior is not characterized - the MAX6377XR27+T is not intended for operation in that region.

Is the MAX6377XR27+T pin-compatible with other devices in the MAX6375–MAX6380 family, and what package does it use?

The MAX6377XR27+T uses the SC70-3 package (pin 1 = GND, pin 2 = OUT, pin 3 = VCC) and shares identical pinout with all SC70-packaged variants in the MAX6375–MAX6380 family (e.g., MAX6375XR22+T, MAX6378XR33+T). However, output logic differs: MAX6377XR27+T is open-drain active-low, while MAX6376 variants are push-pull active-high - direct substitution requires verifying output type and load compatibility.