Analog Devices Inc./Maxim Integrated MAX6862UK29+T

Overview

MAX6862UK29+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring a factory-trimmed 2.925V reset threshold, pin-selectable 10ms/150ms (min) reset timeout, active-high push-pull RESET output, manual reset input (MR), and no external components required. It ensures reliable power-on reset and brownout protection for ultra-low-power portable systems.

For engineers reviewing the MAX6862UK29+T datasheet, MAX6862UK29+T pinout, MAX6862UK29+T application, or MAX6862UK29+T equivalent, this device delivers verified 170nA typical supply current, guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients, and precise voltage monitoring for battery-powered medical and consumer electronics.

Technical Context

The MAX6862UK29+T implements a precision bandgap-based voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, coupled with a digital timeout generator that supports two fixed delay options selected via the CT pin (low = 10ms min, high = 150ms min). Its MR input includes internal 10kΩ pullup and 250ns MR-to-reset delay.

This variant belongs to the MAX6861–MAX6863 subgroup and excludes watchdog timer functionality. It asserts an active-high push-pull RESET signal when VCC falls below 2.925V or MR is pulled low, holding RESET high for the selected timeout period after recovery - ensuring µP initialization stability during power transitions.

Key Specifications

Pinout & Package

MAX6862UK29+T uses a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm height) with gull-wing leads, lead-free (RoHS-compliant) finish, and moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6862UK29+T, MAX6861UK29+T offers identical supervision accuracy and ultra-low current but inverted RESET polarity, while TPS3836K29DBVR trades nanopower operation for broader TI support and fixed timing - making MAX6862UK29+T optimal for space- and battery-limited active-high reset systems.

Availability

MAX6862UK29+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and PDAs requiring stable component supply with long-term lifecycle assurance and RoHS-compliant packaging.

Supply support for MAX6862UK29+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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, medical, and portable applications.

The MAX6861–MAX6863 family was designed specifically for ultra-low-power microprocessor supervision in battery-critical medical and consumer devices, emphasizing sub-µA quiescent current and flexible reset timing without external components.

FAQ

What is the exact reset threshold voltage of the MAX6862UK29+T?

The MAX6862UK29+T has a factory-trimmed reset threshold of 2.925V, with ±2.5% tolerance over the full operating temperature range (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "29" corresponds to 2.925V nominal. The MAX6862UK29+T maintains this accuracy without calibration or external adjustment.

How does the CT pin configure the reset timeout on the MAX6862UK29+T?

On the MAX6862UK29+T, the CT pin selects between two minimum reset timeout periods: connecting CT to GND (logic low) selects 10ms, while connecting CT to VCC (logic high) selects 150ms. These values are specified in Table 1 of the datasheet and are guaranteed minimums - actual timeout may extend up to 300ms at maximum conditions. The selection takes effect immediately upon CT state change.

Does the MAX6862UK29+T include a watchdog timer function?

No, the MAX6862UK29+T does not include a watchdog timer. It belongs to the MAX6861–MAX6863 subgroup, which provides manual reset (MR) and pin-selectable reset timeout (CT) but omits WDI functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK29D3S). The MAX6862UK29+T datasheet explicitly lists "-" under WDI column in the Selector Guide.

What is the RESET output type and drive strength of the MAX6862UK29+T?

The MAX6862UK29+T features an active-high push-pull RESET output. When deasserted, it sources ≥500µA at VOH ≥ 0.8×VCC (for VCC ≥ 2.38V); when asserted, it sinks ≥1.2mA at VOL ≤ 0.3V (for VCC ≥ 2.38V). This eliminates the need for external pullup resistors and ensures direct compatibility with µPs requiring high-true reset inputs.

Is the MAX6862UK29+T pin-compatible with other supervisory ICs?

Yes, the MAX6862UK29+T is pin-compatible with the TPS3836/TPS3837/TPS3838 series per the datasheet's Features section. All share identical 5-pin SOT23 pinout (VCC, CT/MR, GND, MR/CT, RESET), though functional mapping differs - e.g., TPS3836 uses pin 1 for GND, while MAX6862UK29+T uses pin 1 for RESET. Direct replacement requires verification of RESET polarity and timeout configuration.