Analog Devices Inc./Maxim Integrated MAX6422XS16+

Overview

MAX6422XS16+ 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 1.575V reset threshold (±1.5% at +25°C), 1.6µA typical quiescent current, and capacitor-adjustable reset timeout (275µs base + 2.73s/F × CSRT). It ensures reliable power-up sequencing in battery-powered embedded controllers.

For engineers reviewing the MAX6422XS16+ datasheet, MAX6422XS16+ pinout, MAX6422XS16+ application, or MAX6422XS16+ equivalent, key selection criteria include its active-high push-pull output, SC70-4 footprint compatibility, guaranteed reset validity down to VCC = 1V, immunity to sub-50µs VCC transients at 100mV overdrive, and precise 0.65V internal ramp reference for timeout control.

Technical Context

The MAX6422XS16+ implements a precision voltage comparator with 2.5% threshold accuracy over –40°C to +125°C, coupled to a 240nA constant-current source that charges an external capacitor on the SRT pin to generate the reset timeout delay. Its push-pull output drives high actively without requiring external pullup components.

Unlike open-drain variants, the MAX6422XS16+ provides rail-to-rail VOH (≥0.8×VCC at ISOURCE = 800µA) and low VOL (≤0.4V at ISINK = 3.2mA), enabling direct interface with CMOS inputs across 1.8V–5V logic families while maintaining valid reset assertion down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6422XS16+ uses the SC70-4 (X4+1) package: 1.3mm × 1.0mm × 0.6mm body, 0.65mm pitch, lead-free (RoHS-compliant), thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6421XS16+, the MAX6422XS16+ eliminates firmware inversion or external logic for active-high reset signaling; compared with TLV803EB16DBVR, it offers precise timeout tuning via capacitor selection - critical for µPs with tight reset timing windows.

Availability

MAX6422XS16+ is available at Aetrix Electronics and suitable for battery-powered embedded controllers, medical sensor nodes, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6422XS16+ 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, communications, and computing markets.

The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervision for space- and energy-constrained systems - designed specifically for portable, medical, and automotive applications demanding precision voltage monitoring and flexible timing control.

FAQ

What is the factory-trimmed reset threshold voltage for MAX6422XS16+?

The MAX6422XS16+ has a factory-laser-trimmed reset threshold of 1.575V, with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value corresponds to the "16" suffix per Table 1 in the datasheet and is optimized for monitoring 1.6V–1.8V supply rails in low-voltage systems.

Does MAX6422XS16+ require an external pullup resistor on the RESET pin?

No, MAX6422XS16+ does not require an external pullup resistor because it features an active-high push-pull output stage. The RESET pin actively drives high (VOH ≥ 0.8×VCC) and low (VOL ≤ 0.4V), eliminating reliance on external components for logic-level definition - unlike open-drain variants such as MAX6423XS16+.

How is the reset timeout period calculated for MAX6422XS16+?

The reset timeout period tRP for MAX6422XS16+ is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is the capacitor value in farads connected between SRT and GND. For example, a 1500pF capacitor yields tRP ≈ 4.375ms. The 240nA internal ramp current charges CSRT to a 0.65V threshold to deassert RESET.

Can MAX6422XS16+ operate reliably during VCC brownout conditions below 1.6V?

Yes, MAX6422XS16+ guarantees valid RESET assertion down to VCC = 1.0V, meaning it continues to monitor and assert reset correctly even as supply voltage collapses - critical for preventing erratic µP behavior during deep brownout. However, output drive strength degrades below VCC = 1.8V, so system-level logic thresholds must be verified.

What package type and footprint does MAX6422XS16+ use?

MAX6422XS16+ uses the SC70-4 (X4+1) package: 1.3mm × 1.0mm body, 0.65mm pin pitch, and RoHS-compliant lead-free finish. Its top mark is "ACV", and it shares land pattern 90-0187 per Maxim's package documentation - distinct from SOT143-4 (U4+1) despite identical pin count and function.