Analog Devices Inc./Maxim Integrated MAX6862UK225

Overview

MAX6862UK225 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 from 1.2V to 5.5V with factory-trimmed 2.235V reset threshold (±2.5%), guarantees valid 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 MAX6862UK225 datasheet, MAX6862UK225 pinout, MAX6862UK225 application, or MAX6862UK225 equivalent, this device serves as a low-power, temperature-stable reset supervisor with configurable timing, immunity to short VCC transients, and guaranteed operation across -40°C to +85°C industrial temperature range.

Technical Context

The MAX6862UK225 implements a precision voltage monitor with hysteresis (0.5% of VTH), a fixed-delay reset timeout generator, and a CMOS-compatible MR input with 10kΩ internal pullup. Its CT pin selects between two factory-validated minimum timeout periods: 10ms (D1) or 150ms (D3), as confirmed in Table 1 of the datasheet.

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 2.235V or MR is pulled low, holding RESET high for the selected timeout after recovery - ensuring µP initialization integrity during brownout and power-up sequences.

Key Specifications

Pinout & Package

MAX6862UK225 is housed in a RoHS-compliant 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6862UK225, MAX6861UK225 offers identical supervision functionality with inverted RESET polarity, while TPS3836K22 provides tighter threshold tolerance but sacrifices timing configurability - making MAX6862UK225 optimal for designs needing both low ICC and hardware-selectable boot timing.

Availability

MAX6862UK225 is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, handheld diagnostic tools, and low-power wearable sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX6862UK225 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 small form factor.

The MAX6861–MAX6863 family was engineered specifically for battery-powered medical and portable electronics, delivering nanopower supervision with hardware-configurable timing and guaranteed operation down to 1.1V VCC.

FAQ

What is the exact reset threshold voltage of the MAX6862UK225?

The MAX6862UK225 has a factory-trimmed reset threshold voltage of 2.235V (typical), with ±2.5% tolerance over temperature and supply voltage. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "225" corresponds to 2.235V. The device guarantees valid reset assertion down to VCC = 1.1V, making it suitable for brownout protection in 2.5V and 3.3V systems.

How does the CT pin configure the reset timeout period on the MAX6862UK225?

On the MAX6862UK225, the CT pin selects between two minimum reset timeout periods: connecting CT to GND selects 10ms (D1), and connecting CT to VCC selects 150ms (D3). These values are specified in Table 1 of the datasheet as 10/15/25ms (min/typ/max) and 150/225/300ms respectively. The selection is purely hardware-based and takes effect immediately upon power-up or reset release.

Does the MAX6862UK225 include a watchdog timer function?

No, the MAX6862UK225 does not include a watchdog timer. It belongs to the MAX6861–MAX6863 subgroup, which features manual reset (MR) and pin-selectable reset timeout (CT) but omits the WDI input and watchdog circuitry. Watchdog capability is exclusive to MAX6864–MAX6869 variants. The MAX6862UK225 is strictly a voltage-monitoring and reset-timing supervisory IC.

What is the RESET output type and drive capability of the MAX6862UK225?

The MAX6862UK225 provides an active-high push-pull RESET output. When asserted, RESET is driven low; when deasserted, it is driven high to VCC. Per Electrical Characteristics, VOH is 0.8 × VCC at ISOURCE = 200µA (VCC ≥ 1.71V), and VOL is 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V). This eliminates the need for an external pullup resistor and ensures clean, rail-to-rail reset signaling.

Is the MAX6862UK225 compatible with the TPS3836 series?

The MAX6862UK225 is pin-compatible with the TPS3836/TPS3837/TPS3838 family per the datasheet's Features section, but functional compatibility requires verification of RESET polarity and timeout requirements. While both offer similar low ICC and threshold ranges, the MAX6862UK225 provides hardware-selectable timing via CT and active-high RESET - unlike the fixed-timing, active-low TPS3836K22. Direct substitution may require board-level changes if timing or polarity differs.