Analog Devices Inc./Maxim Integrated MAX6377UR22+T

Overview

MAX6377UR22+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector optimized for battery and power-supply monitoring in portable systems. It features a factory-trimmed 2.20V threshold (±2.5% over temperature), 500nA supply current at +25°C, and guaranteed operation down to VCC = 1V - enabling reliable brownout detection in Li+-based and low-voltage DC/DC-powered equipment.

For engineers reviewing the MAX6377UR22+T datasheet, MAX6377UR22+T pinout, MAX6377UR22+T application, or MAX6377UR22+T equivalent, key selection criteria include its open-drain output architecture, 2.20V trip point with hysteresis, SC70/SOT23-3 package compatibility, transient immunity up to 200µs at 100mV overdrive, and support for pull-up to any rail ≤5.5V.

Technical Context

The MAX6377UR22+T implements a precision bandgap reference and comparator with internally trimmed resistors to set a fixed 2.20V detection threshold. Its open-drain output asserts low when VCC falls below VTH and remains valid down to 1V supply - ensuring reset integrity during deep brownout conditions.

It incorporates built-in immunity to fast negative-going VCC transients: propagation delay is 6.3µs (typ) with maximum tolerable glitch duration of 200µs at 100mV overdrive. The device requires no external components and operates across -40°C to +85°C without calibration.

Key Specifications

Pinout & Package

MAX6377UR22+T is housed in a 3-pin SOT23-3 package (lead-free, RoHS-compliant), with pin 1 = GND, pin 2 = OUT (open-drain), pin 3 = VCC. This compact 2.92mm × 1.3mm footprint supports high-density PCB layouts in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB22DBZR and APX803S-22SA-7, the MAX6377UR22+T delivers superior ultra-low-current performance (500nA) combined with open-drain output and proven transient immunity - making it optimal for long-life, multi-rail, and noise-prone battery systems.

Availability

MAX6377UR22+T is available at Aetrix Electronics and suitable for battery-powered wearables, portable medical devices, low-voltage microcontroller supervision, and energy-harvesting systems requiring stable component supply with lead-free compliance and tape-and-reel packaging.

Supply support for MAX6377UR22+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, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.

The MAX6375–MAX6380 family was developed specifically for ultra-low-power voltage monitoring in portable and battery-critical systems - emphasizing nanoscale current consumption, factory-trimmed accuracy, and robust transient rejection without external components.

FAQ

What is the exact reset threshold voltage of the MAX6377UR22+T?

The MAX6377UR22+T has a factory-trimmed nominal reset threshold of 2.20V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). At +25°C, the typical threshold is 2.200V, and the datasheet specifies min/max bounds of 2.145V to 2.250V across temperature. This value is laser-trimmed during production and requires no external adjustment.

Does the MAX6377UR22+T support operation below 2.2V VCC?

Yes, the MAX6377UR22+T is fully specified to operate down to VCC = 1.2V and guarantees correct output logic state (OUT low when VCC < VTH) down to 1V. Its internal bandgap reference and comparator remain functional even as supply voltage approaches the detection threshold - enabling reliable reset assertion during deep brownout conditions common in battery discharge profiles.

What pull-up resistor value should be used with the MAX6377UR22+T open-drain output?

For the MAX6377UR22+T open-drain output, a pull-up resistor between 10kΩ and 100kΩ is recommended. A 10kΩ resistor ensures fast rise time and sufficient drive strength for most MCU reset inputs, while a 100kΩ resistor minimizes current draw in ultra-low-power sleep modes. The choice depends on bus capacitance and required edge speed - the device sinks up to 100µA while asserted, guaranteeing VOL ≤0.4V at that load.

How does the MAX6377UR22+T handle power supply transients?

The MAX6377UR22+T rejects short negative-going VCC transients via internal filtering: it will not assert reset for glitches shorter than ~200µs when VCC dips 100mV below threshold. This behavior is characterized in the "Maximum Transient Duration vs. Threshold Overdrive" graph. The device ignores such fast disturbances while remaining responsive to sustained brownouts - preventing spurious resets in electrically noisy environments like motor-driven or RF-integrated systems.

Is the MAX6377UR22+T pin-compatible with other parts in the MAX6375–MAX6380 family?

Yes, all MAX6375–MAX6380 variants - including MAX6377UR22+T - share identical 3-pin SOT23-3 and SC70-3 footprints and pinouts (GND, OUT, VCC). However, output logic type differs: MAX6377/MAX6380 use open-drain, while MAX6375/MAX6378 use push-pull. Swapping between open-drain and push-pull types requires verifying external circuit compatibility (e.g., pull-up presence), but mechanical layout and soldering remain unchanged.