Analog Devices Inc./Maxim Integrated MAX6862UK28+T

Overview

The MAX6862UK28+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull RESET output, manual reset (MR) input, and pin-selectable 10ms/150ms (min) reset timeout via CT terminal. It monitors VCC with factory-trimmed 2.800V 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 MAX6862UK28+T datasheet, MAX6862UK28+T pinout, MAX6862UK28+T application, or MAX6862UK28+T equivalent, key selection criteria include its 2.8V threshold accuracy, CT-configurable reset delay, immunity to short VCC transients (<40µs at 100mV overdrive), and guaranteed operation across –40°C to +85°C industrial temperature range.

Technical Context

This device belongs to the MAX6854–MAX6869 family of ultra-low-power µP supervisors. It integrates voltage monitoring, manual reset assertion, and a fixed-function reset timeout generator - but no watchdog timer (unlike MAX6864–MAX6869). The CT pin selects between two factory-programmed timeout options (D1 = 10ms min or D3 = 150ms min), enabling design flexibility without external components.

The MAX6862UK28+T uses a precision bandgap reference and hysteresis-controlled comparator to ensure stable reset assertion/deassertion. Its push-pull active-high RESET output drives directly into µP reset inputs without pullup resistors, and guarantees valid logic levels down to VCC = 1.1V - critical for brownout recovery in low-voltage embedded systems.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (lead-free, RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6861UK28+T and TPS3836K28DBVR, the MAX6862UK28+T uniquely delivers active-high RESET with CT-based timeout selection - simplifying interface design for modern µPs while retaining ultra-low power and precise threshold matching.

Availability

MAX6862UK28+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, handheld diagnostic tools, and low-power IoT edge sensors requiring stable component supply across long production lifecycles.

Supply support for MAX6862UK28+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 industrial, medical, and communications applications - emphasizing low power, high reliability, and integration.

The MAX6854–MAX6869 family was engineered specifically for battery-constrained portable medical and instrumentation systems, delivering nanopower supervision with factory-trimmed accuracy and minimal external components.

FAQ

What is the exact reset threshold voltage of the MAX6862UK28+T?

The MAX6862UK28+T has a factory-trimmed reset threshold voltage of 2.800V with ±2.5% tolerance over –40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "28" corresponds to 2.800V nominal. The device asserts RESET high when VCC falls below this threshold and holds it for the selected timeout period after VCC rises above it. The MAX6862UK28+T maintains this accuracy without external calibration.

How does the CT pin configure the reset timeout on the MAX6862UK28+T?

On the MAX6862UK28+T, the CT pin selects between two minimum reset timeout periods: connect CT to GND for 10ms (min), or to VCC for 150ms (min). This mapping is defined in Table 1 of the datasheet and applies exclusively to the MAX6861/MAX6862/MAX6863 series. The CT input has CMOS-compatible thresholds (VIL ≤ 0.2×VCC, VIH ≥ 0.8×VCC), and the timeout change takes effect after the current reset cycle completes. No external resistor or capacitor is needed - the MAX6862UK28+T implements this entirely internally.

Does the MAX6862UK28+T include a watchdog timer function?

No, the MAX6862UK28+T does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which features manual reset (MR) and CT-selectable timeout but omits the WDI input and watchdog circuitry found in MAX6864–MAX6869 variants. The MAX6862UK28+T provides only VCC monitoring, MR-initiated reset, and timeout control - making it suitable for applications where software execution monitoring is handled externally or not required. Watchdog capability requires selecting a MAX6864-series part instead.

What is the guaranteed operating voltage range for the MAX6862UK28+T?

The MAX6862UK28+T operates across a supply voltage range of 1.2V to 5.5V, with full functionality including valid RESET assertion guaranteed down to VCC = +1.1V. This extended low-voltage operation ensures deterministic reset behavior during deep brownout conditions - critical for battery-powered systems nearing end-of-life. The 170nA typical supply current is specified at VCC = 1.8V, and electrical characteristics remain valid across the full –40°C to +85°C temperature range. All parameters for the MAX6862UK28+T are tested and guaranteed per the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables.

Is the MAX6862UK28+T pin-compatible with other supervisory ICs?

Yes, the MAX6862UK28+T is pin-compatible with the TPS3836/TPS3837/TPS3838 family from Texas Instruments, as explicitly stated in the "Features" section of the datasheet. Both share identical 5-pin SOT23 pinout (VCC, CT/MR, GND, RESET, MR/CT), enabling direct replacement in existing layouts - though functional differences (e.g., CT vs. fixed timeout, active-high vs. active-low RESET) require verification in the target application. The MAX6862UK28+T also shares mechanical compatibility with other MAX68xx devices in SOT23-5, but electrical pin functions differ across subgroups (e.g., WDI on MAX6864 replaces CT on MAX6862UK28+T).