Analog Devices Inc./Maxim Integrated MAX6862UK33+T

Overview

The MAX6862UK33+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and pin-selectable 10ms/150ms (min) reset timeout via CT input. It monitors VCC with a factory-trimmed 3.3V reset threshold (±2.5%), asserts reset down to VCC = 1.1V, and draws only 170nA typical supply current - ideal for battery-powered glucose monitors and portable medical devices.

For engineers reviewing the MAX6862UK33+T datasheet, MAX6862UK33+T pinout, MAX6862UK33+T application, or MAX6862UK33+T equivalent, key selection criteria include its 3.3V reset threshold accuracy, CT-configurable reset delay, MR-driven reset initiation, and guaranteed operation across –40°C to +85°C industrial temperature range.

Technical Context

This device implements a precision voltage monitor with hysteresis (0.5% of VTH), a glitch-immune manual reset input (200ns rejection, 1µs minimum pulse width), and a CT-controlled reset timeout generator selecting between 10ms (D1) or 150ms (D3) minimum durations. Its internal 10kΩ MR pullup eliminates external components.

The MAX6862UK33+T belongs to the MAX6861–MAX6863 variant group, distinguished by CT pin functionality and absence of watchdog timer - unlike MAX6864–MAX6869. It uses BiCMOS process (2848 transistors) and guarantees valid reset assertion even as VCC falls to 1.1V.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5 (lead-free, +T suffix), 2.9mm × 1.6mm footprint, 1.1mm height - compatible with high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6861UK33+T, the MAX6862UK33+T provides active-high reset compatibility without external inverters; versus TPS3836K33DBVR, it delivers 15× lower supply current and integrated CT-based timeout flexibility - critical for multi-year medical wearables.

Availability

MAX6862UK33+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, and handheld diagnostic tools requiring stable component supply with long-term lifecycle support and lead-free compliance.

Supply support for MAX6862UK33+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 demanding industrial, medical, and communications applications - emphasizing low power, high reliability, and small form factor.

The MAX6861–MAX6863 family was engineered specifically for ultra-low-power medical and portable electronics, delivering nanopower supervision with configurable timing and robust reset integrity across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of the MAX6862UK33+T?

The MAX6862UK33+T has a factory-trimmed reset threshold of 3.300V with ±2.5% tolerance over –40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "33" corresponds to 3.300V nominal, and Electrical Characteristics specify VTH = VCC falling at 3.300V ±2.5%. The device guarantees valid reset assertion down to VCC = 1.1V.

How does the CT pin configure the reset timeout period on the MAX6862UK33+T?

On the MAX6862UK33+T, the CT pin selects between two minimum reset timeout periods: connect CT to GND for 10ms (D1), or to VCC for 150ms (D3). This is defined in Table 1 and Pin Description - CT is a logic-level input with no external bias required. The timeout begins after VCC rises above VTH or MR deasserts, and the selected duration is guaranteed per Electrical Characteristics (tRP min values).

Does the MAX6862UK33+T include a watchdog timer function?

No, the MAX6862UK33+T does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which features only voltage monitoring, manual reset (MR), and CT-selectable reset timeout. Watchdog functionality is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK33D3S), which add WDI input and fixed 3.3s/209s timeout options.

What is the reset output type and drive capability of the MAX6862UK33+T?

The MAX6862UK33+T provides an active-high push-pull RESET output. Per Electrical Characteristics, VOH ≥ 0.8×VCC when sourcing 200µA (VCC ≥ 1.71V) or 500µA (VCC ≥ 2.38V), and VOL ≤ 0.3V when sinking 1.2mA (VCC ≥ 2.38V). This eliminates need for external pullup resistors and ensures direct interfacing with µP reset pins expecting active-high assertion.

Is the MAX6862UK33+T pin-compatible with other supervisory ICs?

The MAX6862UK33+T is pin-compatible with the MAX6861UK33+T and MAX6863UK33+T (same SOT23-5 pinout: RESET, GND, MR, CT, VCC), but not with MAX6854/MAX6855/MAX6856 due to different pin functions (e.g., no CT on those variants). It is also pin-compatible with TPS3836/TPS3837/TPS3838 per Features section - though electrical behavior (e.g., reset polarity, timeout method) differs significantly.