Analog Devices Inc./Maxim Integrated MAX6377XR28+

Overview

MAX6377XR28+ 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 2.80V threshold (±2.5% over temperature), 500nA supply current at +25°C, and guaranteed operation down to VCC = 1V. Its SC70-3 package supports space-constrained applications such as wearables and IoT sensors where precision reset assertion during brownout is critical.

For engineers reviewing the MAX6377XR28+ datasheet, MAX6377XR28+ pinout, MAX6377XR28+ application, or MAX6377XR28+ equivalent, key selection criteria include its 2.80V trip point, open-drain output architecture requiring external pull-up, immunity to sub-200µs VCC transients, and compatibility with 1.2V–5.5V supply domains across -40°C to +85°C.

Technical Context

The MAX6377XR28+ implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.80V detection threshold. It asserts OUT low when VCC falls below VTH and holds valid logic state down to 1V supply - enabling reliable reset generation even during deep discharge.

Its open-drain output sinks up to 100µA at 0.4V (VOL) under load and exhibits 20µs propagation delay (falling edge) with ±40ppm/°C tempco on VTH. The device rejects fast negative-going VCC transients via internal filtering, with maximum tolerable glitch width decreasing as threshold overdrive increases.

Key Specifications

Pinout & Package

MAX6377XR28+ is housed in a 3-pin SC70-3 package (2.0mm × 1.25mm × 0.95mm), suitable for high-density PCB layouts and automated assembly. The package is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB28DBZR and APX803S-28SA-7, the MAX6377XR28+ offers superior transient immunity, guaranteed 1V operation, and industry-leading 500nA supply current - making it optimal for ultra-low-power, noise-prone, or multi-rail embedded systems.

Availability

MAX6377XR28+ is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial wireless nodes, and smart home sensor hubs requiring stable component supply and long-term production continuity.

Supply support for MAX6377XR28+ 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 management, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage supervision in battery-critical systems - delivering factory-trimmed thresholds, nanoscale current draw, and robust transient rejection without external components.

FAQ

What is the exact reset threshold voltage of the MAX6377XR28+?

The MAX6377XR28+ has a factory-trimmed nominal reset threshold of 2.80V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed during production and does not require external calibration. At +25°C, the typical threshold is 2.80V, and the device maintains this specification across its 1.2V–5.5V supply range. The MAX6377XR28+ datasheet confirms this threshold in Table 1 under suffix "R28".

Does the MAX6377XR28+ require an external pull-up resistor on the OUT pin?

Yes, the MAX6377XR28+ features an open-drain active-low output, so an external pull-up resistor is mandatory for proper logic-level translation. The resistor connects between OUT and the target logic rail (up to 5.5V). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and sink current requirements. The MAX6377XR28+ can sink up to 100µA while maintaining VOL ≤ 0.4V, as specified in the Electrical Characteristics table.

Can the MAX6377XR28+ operate reliably below 1.8V supply?

Yes, the MAX6377XR28+ is fully specified to operate down to VCC = 1.2V and guarantees correct output logic state (OUT asserted low) for VCC as low as 1.0V. This capability enables use in deeply discharged battery scenarios and ultra-low-voltage microcontroller systems. The device draws only 500nA at +25°C and maintains ±2.5% threshold accuracy across the entire -40°C to +85°C range, even at minimum supply.

How does the MAX6377XR28+ handle short voltage transients on the VCC line?

The MAX6377XR28+ incorporates internal filtering to reject fast negative-going VCC transients. According to the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive", it ignores glitches shorter than ~200µs when VCC dips 100mV below VTH. As the amplitude of the transient increases, the maximum tolerable duration decreases - for example, a 200mV dip is rejected if shorter than ~100µs. This prevents false resets in noisy power environments.

Is the MAX6377XR28+ pin-compatible with other devices in the MAX6375–MAX6380 family?

Yes, all MAX6375–MAX6380 variants - including MAX6377XR28+ - share identical SC70-3 and SOT23-3 pinouts (GND, OUT, VCC). The MAX6377XR28+ uses Pin 1 = GND, Pin 2 = OUT, Pin 3 = VCC in SC70-3. This uniformity allows direct substitution within the same package type when threshold and output configuration match, though designers must verify that open-drain behavior and 2.80V trip point meet system requirements.