Analog Devices Inc./Maxim Integrated MAX6422XS23-T

Overview

MAX6422XS23-T from Maxim Integrated is a low-power, active-high push-pull microprocessor reset supervisor IC in SC70-4 package, monitoring VCC from 1.6V to 5V with factory-trimmed 2.313V reset threshold (suffix '23'), capacitor-adjustable reset timeout (275µs base + 2.73×10⁶·CSRT), and guaranteed operation down to VCC = 1V. It asserts a high-level RESET signal during brownout and holds it for the timeout period after VCC recovers - used in battery-powered controllers and portable medical instruments.

For engineers reviewing the MAX6422XS23-T datasheet, MAX6422XS23-T pinout, MAX6422XS23-T application, or MAX6422XS23-T equivalent, key selection criteria include its active-high push-pull output, SC70-4 footprint, ±2.5% reset threshold accuracy over -40°C to +125°C, 1.6µA typical quiescent current, and immunity to sub-50µs VCC transients when overdriven by 100mV.

Technical Context

The MAX6422XS23-T implements a precision voltage comparator with laser-trimmed reference and hysteresis (4×VTH), coupled to a 240nA current source that charges an external capacitor on the SRT pin to generate the reset timeout delay. Its internal ramp circuit compares the SRT voltage against a fixed 0.65V threshold to control reset deassertion timing.

Unlike open-drain variants, the MAX6422XS23-T uses a push-pull output stage capable of sourcing up to 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC and VOL ≤ 0.4V at ISINK = 3.2mA - enabling direct interface to CMOS inputs without external pullups.

Key Specifications

Pinout & Package

MAX6422XS23-T is housed in a 4-pin SC70-4 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant finish. Pin 1 is marked with a dot; pin numbering follows standard SC70 top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6422XS23-T, the MAX6422US23-T offers identical functionality in a larger SOT143 package suitable for prototyping, while TLV803EB23DBZR trades adjustable timing and robust drive strength for minimal current draw and smaller size - making each optimal for distinct trade-offs in cost, layout, and power budget.

Availability

MAX6422XS23-T is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered industrial controllers, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6422XS23-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 reliability and low-power operation.

The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervisors targeting space- and energy-constrained embedded systems where deterministic power-on reset and brownout recovery are mission-critical.

FAQ

What is the exact reset threshold voltage of MAX6422XS23-T?

The MAX6422XS23-T has a factory-trimmed nominal reset threshold of 2.313V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during production and corresponds to the '23' suffix in the part number, per Table 1 of the datasheet.

Can MAX6422XS23-T operate with a 1.8V supply?

Yes, MAX6422XS23-T operates with VCC from 1.0V to 5.5V and guarantees valid reset assertion down to VCC = 1V. At 1.8V, its reset threshold remains 2.313V, so it will assert RESET when the 1.8V rail drops below that level - meaning it cannot supervise a 1.8V system directly, but can supervise higher rails (e.g., 2.5V, 3.3V, or 5V) feeding that 1.8V LDO.

How do I calculate the capacitor value for a 150ms reset timeout with MAX6422XS23-T?

Use the formula tRP = 2.73×10⁶·CSRT + 275µs. For tRP = 150ms = 0.150s: CSRT = (0.150 − 0.000275) / 2.73×10⁶ ≈ 54.7nF. A standard 56nF X7R ceramic capacitor (low-leakage, <10nA) is recommended and yields ~155ms timeout, verified in Figure 2 of the datasheet.

Is MAX6422XS23-T pin-compatible with any other Maxim reset ICs?

MAX6422XS23-T shares the same 4-pin SC70-4 pinout and function mapping with MAX6421XS23-T and MAX6423XS23-T, differing only in RESET polarity (active-high vs. active-low push-pull vs. active-low open-drain). No other manufacturer's 4-pin SC70 reset IC is pin-compatible due to differing SRT/RESET/GND/VCC assignments.

Does MAX6422XS23-T require an external pullup resistor on the RESET pin?

No. MAX6422XS23-T features an active-high push-pull RESET output, which actively drives both high and low states. Unlike open-drain variants (e.g., MAX6423), it does not require an external pullup resistor - simplifying layout and reducing component count in space-sensitive designs.