Analog Devices Inc./Maxim Integrated MAX6413UK23

Overview

MAX6413UK23 from Maxim Integrated is a low-power microprocessor supervisory circuit in a 5-pin SOT23-5 package, featuring an open-drain active-low RESET output, factory-trimmed 2.313V reset threshold (±2.5% over temperature), and capacitor-adjustable reset timeout period. It monitors VCC from 1.6V to 5V, asserts reset down to VCC = 1V, and draws only 1.6µA typical supply current-ideal for battery-powered medical instruments requiring reliable brownout detection and controlled power-up sequencing.

For engineers reviewing the MAX6413UK23 datasheet, MAX6413UK23 pinout, MAX6413UK23 application, or MAX6413UK23 equivalent, key selection criteria include its open-drain output compatibility with mixed-voltage µP interfaces, guaranteed reset validity at VCC ≥ 1V, immunity to sub-50µs VCC transients when overdriven by 100mV, and precise 240nA SRT ramp current enabling accurate timeout tuning via external capacitor.

Technical Context

The MAX6413UK23 implements a precision voltage monitor with laser-trimmed internal reference and hysteresis of 4×VTH (≈9.25mV). Its reset assertion is triggered by VCC falling below 2.313V, with a minimum 80µs VCC-to-reset delay under 1mV/µs slew rate.

Reset deassertion relies on an internal 240nA current source charging an external capacitor (CSRT) from the SRT pin to a 0.65V ramp threshold; timeout tRP = 2.73×10⁶ × CSRT + 275µs. The open-drain RESET output requires an external pullup (10kΩ–100kΩ) to any supply ≤5.5V and sinks ≥50µA at VOL ≤0.3V (VCC ≥1.0V).

Key Specifications

Pinout & Package

MAX6413UK23 is housed in a 5-pin SOT23-5 package (outline 21-0057) with 0.95mm pitch, 2.9mm × 1.6mm body, and exposed pad for thermal enhancement. Pin 1 is marked with a dot; pin numbering follows standard SOT23 convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6425UK23-T, MAX6413UK23 offers full automotive-grade temperature range; compared with NCP302LSN23T1G, it provides design flexibility through adjustable timeout - critical for optimizing boot reliability across diverse µP architectures.

Availability

MAX6413UK23 is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered industrial controllers, automotive body control modules, and intelligent power meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6413UK23 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 MAX64xx family delivers ultra-low-power, precision voltage supervision with flexible timeout control - designed specifically for space-constrained, battery-operated, and thermally demanding embedded systems where deterministic reset behavior is mission-critical.

FAQ

What is the exact reset threshold voltage of MAX6413UK23 and how stable is it over temperature?

The MAX6413UK23 has a factory-trimmed nominal reset threshold of 2.313V, with guaranteed accuracy of ±2.5% over the full operating range of -40°C to +125°C. This stability is achieved via laser-trimmed internal resistors and a precision bandgap reference, ensuring consistent brownout detection without external calibration. The normalized threshold variation is less than ±0.5% across temperature, as confirmed in Figure toc08 of the datasheet.

Can MAX6413UK23 drive a 3.3V microcontroller reset pin directly?

Yes, MAX6413UK23 can directly interface with a 3.3V µP reset pin using its open-drain RESET output. Connect a 10kΩ–47kΩ pullup resistor from the RESET pin to the 3.3V supply. The device sinks ≥50µA while maintaining VOL ≤0.3V at VCC ≥1.0V, ensuring solid logic-low assertion. No level-shifter is needed, and the output remains valid down to VCC = 1V.

How do I calculate the external capacitor value for a 200ms reset timeout with MAX6413UK23?

Use the formula tRP = 2.73×10⁶ × CSRT + 275µs. For tRP = 200ms (0.2s), solve: CSRT = (0.2 − 0.000275) / 2.73×10⁶ ≈ 73.0nF. Select a low-leakage ceramic capacitor (X7R or C0G, <10nA leakage); a 75nF part yields ~207ms timeout. Verify with oscilloscope measurement, as board parasitics may add ~1–2% error.

Is MAX6413UK23 pin-compatible with other SOT23-5 reset supervisors?

MAX6413UK23 shares the same 5-pin SOT23-5 footprint and pinout (VCC, GND, N.C., SRT, RESET) with MAX6340, MAX6424, MAX6425, and MAX6426. However, output type differs: MAX6413UK23 and MAX6425 are open-drain, while MAX6424 is push-pull. Swapping requires verifying RESET logic polarity and drive strength compatibility in the target circuit.

Does MAX6413UK23 require special PCB layout considerations for the SRT pin?

Yes - the SRT pin connects to a precision 240nA current source, making it highly sensitive to leakage and stray capacitance. Keep the SRT trace short (<5mm), avoid routing near digital signals or high-voltage nets, use guard rings if necessary, and clean flux residues thoroughly. Stray capacitance >1pF or leakage >1nA will cause timeout errors exceeding ±5%, per Layout Consideration section (page 6).