Analog Devices Inc./Maxim Integrated MAX6377XR23+

Overview

MAX6377XR23+ from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector optimized for battery monitoring in portable systems. It features a factory-trimmed 2.32V threshold (±2.5% over temperature), 500nA supply current, and operates down to 1V VCC - enabling reliable power-fail detection in Li⁺-powered devices with minimal quiescent drain.

For engineers reviewing the MAX6377XR23+ datasheet, MAX6377XR23+ pinout, MAX6377XR23+ application, or MAX6377XR23+ equivalent, this device is selected for precision reset generation in space-constrained, low-voltage embedded systems where supply current, threshold accuracy, and transient immunity are critical design constraints.

Technical Context

The MAX6377XR23+ integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to deliver fixed 2.32V detection without external components. Its internal hysteresis (100mV) prevents chatter during slow VCC decay, and its propagation delay (6.3µs typical) ensures timely reset assertion.

Designed for immunity to fast negative-going VCC transients, it tolerates glitches up to ~200µs at 20mV overdrive (per Typical Operating Characteristics). The open-drain output requires an external pullup and sinks 100µA at 0.4V VOL, supporting interface with diverse logic families up to 5.5V.

Key Specifications

Pinout & Package

MAX6377XR23+ is housed in a 3-pin SC70 package (2.0mm × 1.25mm × 0.9mm), optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB23DBZR and APX803S-23SA-7, the MAX6377XR23+ uniquely combines SC70 packaging, 500nA ICC, ±2.5% full-temperature accuracy, and open-drain flexibility - making it optimal for ultra-compact, long-life, multi-rail reset architectures.

Availability

MAX6377XR23+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, wearable fitness trackers, and smart meter backup circuits requiring stable component supply, lead-free compliance, and tape-and-reel delivery.

Supply support for MAX6377XR23+ 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 engineered specifically for ultra-low-power voltage supervision in battery-critical systems - delivering factory-trimmed thresholds, nanoscale supply current, and robust transient rejection in miniature SC70/SOT23 packages.

FAQ

What is the exact reset threshold voltage of the MAX6377XR23+ and how tightly is it specified?

The MAX6377XR23+ has a factory-trimmed nominal reset threshold of 2.32V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (–40°C to +85°C). This specification is confirmed in Table 1 of the datasheet, where suffix "R23" explicitly maps to 2.32V (typical), 2.285V (min), and 2.355V (max) at +25°C, and 2.262V (min) / 2.375V (max) across temperature. The MAX6377XR23+ achieves this without external components due to internal laser trimming.

Does the MAX6377XR23+ require an external pullup resistor on its OUT pin, and why?

Yes, the MAX6377XR23+ requires an external pullup resistor on its OUT pin because it features an active-low open-drain output. The internal transistor can only sink current (pull OUT low) when VCC falls below 2.32V; it cannot drive high. A pullup resistor connects OUT to a logic rail (e.g., 1.8V, 3.3V, or 5V) to establish a valid logic-high state when the detector is inactive. This architecture enables wired-OR reset busing and level-shifting - key capabilities not possible with push-pull outputs. The MAX6377XR23+ datasheet specifies maximum sink current and VOL to guide resistor selection.

What is the minimum VCC voltage at which the MAX6377XR23+ guarantees correct output logic state?

The MAX6377XR23+ guarantees correct output logic state (i.e., asserted low when VCC < 2.32V, deasserted high when VCC ≥ 2.32V) down to 1V VCC - explicitly stated in the General Description and Electrical Characteristics sections. This is critical for applications where the monitored rail may collapse deeply during battery exhaustion or fault conditions. While the recommended operating range is 1.2V to 5.5V, the 1V guarantee ensures reliable behavior even beyond normal operation, supporting robust system-level brown-out recovery. This specification applies to the MAX6377XR23+ across its full temperature range.

How does the MAX6377XR23+ handle fast voltage transients on the VCC line?

The MAX6377XR23+ is designed to ignore fast negative-going transients on VCC, a feature documented in the Applications Information section and illustrated in Figure MAX6375-04 (Maximum Transient Duration vs. Threshold Overdrive). For example, at a 20mV overdrive (i.e., VCC = 2.32V – 20mV), the device tolerates transients up to ~200µs without asserting OUT. As overdrive increases, the allowable pulse width decreases - ensuring immunity to common switching noise while maintaining responsiveness to genuine brown-outs. This transient rejection is intrinsic to the internal comparator design and does not require external filtering.

Is the MAX6377XR23+ available in both leaded and lead-free packaging, and how is lead-free indicated in the part number?

Yes, the MAX6377XR23+ is available in both leaded and lead-free packaging. Lead-free versions are explicitly denoted by replacing the "-T" suffix with "+T" in the orderable part number - so the lead-free variant is MAX6377XR23+T. The "+" symbol indicates RoHS-compliant, lead-free termination per Maxim's packaging standards. Both versions use the same SC70-3 footprint and electrical specifications; the difference is solely in the finish of the solderable terminals. This dual-option availability supports global manufacturing requirements without redesign.