Analog Devices Inc./Maxim Integrated MAX6412UK23+

Overview

MAX6412UK23+ from Maxim Integrated is a low-power, single-voltage microprocessor reset supervisor IC with factory-trimmed 2.313V VCC reset threshold, manual reset input (MR), and capacitor-adjustable reset timeout delay. It features active-low push-pull RESET output, guaranteed operation down to VCC = 1V, and 1.7µA typical quiescent current - designed for reliable power-on reset assertion in battery-powered controllers and embedded systems.

For engineers reviewing the MAX6412UK23+ datasheet, MAX6412UK23+ pinout, MAX6412UK23+ application, or MAX6412UK23+ equivalent, key selection considerations include its fixed 2.313V reset threshold accuracy (±2.5% over -40°C to +125°C), SRT-pin-based timeout programming via external capacitor, MR pulse width tolerance (≥1µs), and compatibility with µP reset inputs requiring clean, glitch-immune reset assertion during brownout recovery.

Technical Context

The MAX6412UK23+ implements a precision bandgap-based voltage comparator for VCC monitoring and a dedicated manual reset path with internal 20kΩ pullup on MR. Its reset timeout is generated by a 240nA constant-current source charging an external capacitor (CSRT) to a 0.65V internal reference, enabling programmable delays from 275µs to >100ms.

Reset assertion occurs when VCC falls below 2.313V (±2.5%) or MR is pulled low; deassertion requires both VCC > 2.313V and MR high for the full timeout period. The active-low push-pull RESET output drives logic-compatible levels (VOL ≤ 0.4V at ISINK = 3.2mA, VOH ≥ 0.8×VCC) across 1.0V–5.5V supply range.

Key Specifications

Pinout & Package

SOT23-5 package: ultra-compact 2.9mm × 1.6mm footprint with 0.95mm pitch, optimized for space-constrained PCB layouts in portable and automotive electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6412UK23+, MAX6316LUK23+ trades timeout flexibility for guaranteed minimum delay and slightly higher current, while TPS3808G125DBVR sacrifices MR and SRT configurability for lower system-level qualification risk in TI-centric supply chains.

Availability

MAX6412UK23+ is available at Aetrix Electronics and suitable for automotive body control modules, portable medical monitors, industrial PLC I/O submodules, smart energy meters, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges.

Supply support for MAX6412UK23+ 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, and computing applications.

The MAX6412–MAX6420 product line delivers ultra-low-power, configurable reset supervision for microprocessor-based systems where supply rail integrity and deterministic reset timing are critical to functional safety.

FAQ

What is the exact reset threshold voltage of the MAX6412UK23+ and how tightly is it specified?

The MAX6412UK23+ has a nominal VCC reset threshold of 2.313V, with ±2.5% accuracy guaranteed over the full operating temperature range of -40°C to +125°C. This value is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table under "VCC Reset Threshold Accuracy". The suffix "23" in MAX6412UK23+ directly references Table 1, where SUFFIX 23 corresponds to MIN/TYP/MAX values of 2.313V/2.313V/2.371V.

How do I calculate the external capacitor value needed for a specific reset timeout period with the MAX6412UK23+?

To set a desired reset timeout period (tRP) in seconds for the MAX6412UK23+, use the formula CSRT = (tRP − 275µs) / 2.71×10⁶, where CSRT is in farads. For example, a 100ms timeout requires CSRT = (0.1 − 0.000275) / 2,710,000 ≈ 36.8nF. Use low-leakage ceramic capacitors (≤10nA leakage) and keep SRT traces short and noise-isolated per layout guidelines.

Does the MAX6412UK23+ support manual reset functionality, and what are the electrical requirements for the MR pin?

Yes, the MAX6412UK23+ includes a manual reset (MR) input on pin 3. MR is active-low with an internal 20kΩ pullup resistor, so it may be left unconnected if unused. To assert reset, pull MR to ≤0.8V (VIL) for ≥1µs. The device guarantees reset assertion for the full timeout period after MR is released, and rejects glitches <75ns wide. No external debounce circuitry is required for typical pushbutton use.

Can the MAX6412UK23+ operate reliably when the supply voltage (VCC) drops below 1.5V, and what happens to the RESET output in that condition?

Yes, the MAX6412UK23+ is fully specified down to VCC = 1.0V and guarantees valid RESET output behavior (active-low push-pull) for VCC ≥ 1.0V. Below 1.0V, RESET output drive strength declines, but the datasheet confirms RESET remains asserted (low) until VCC rises above the 2.313V threshold. For applications requiring valid logic down to VCC = 0V, a 100kΩ pulldown resistor on RESET is recommended per Figure 6.

What package type and RoHS status does the MAX6412UK23+ use, and where can I find its land pattern?

The MAX6412UK23+ uses the 5-pin SOT23 package (package code U5-2, outline 21-0057), and the "+" suffix indicates lead-free (RoHS-compliant) construction. Land pattern information (footprint) is available at maximintegrated.com/packages under document 90-0174. The device is supplied in tape-and-reel format only, with standard order increments of 2500 pieces.