Analog Devices Inc./Maxim Integrated MAX6860UK16D3+

Overview

MAX6860UK16D3+ from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and reset timeout control. It asserts an active-low push-pull RESET when VCC drops below 1.575V (factory-trimmed threshold), MR is pulled low, or during power-up/brownout - with guaranteed reset validity down to VCC = +1.1V. Designed for ultra-low-power portable systems including glucose monitors and battery-powered PDAs.

For engineers reviewing the MAX6860UK16D3+ datasheet, MAX6860UK16D3+ pinout, MAX6860UK16D3+ application, or MAX6860UK16D3+ equivalent, key selection criteria include its 170nA typical supply current, 150ms minimum reset timeout (D3 option), 1.575V reset threshold, and immunity to short VCC transients - critical for reliable boot sequencing in energy-constrained embedded designs.

Technical Context

The MAX6860UK16D3+ integrates a precision voltage monitor with hysteresis (±2.5% VTH), a fixed 150ms minimum reset timeout timer, and a CMOS-compatible manual reset input with 10kΩ internal pullup. Its reset assertion logic combines VCC monitoring and MR edge detection, with reset deassertion delayed by tRP after both VCC exceeds VTH and MR is released.

No watchdog timer or CT pin is present - confirming MAX6860UK16D3+ belongs to the MAX6858/MAX6860 series without WDI or timeout select functionality. Pin 1 is internally connected (I.C.), pin 4 is RESET (active-low push-pull), and pin 3 is GND - distinguishing it from MR-equipped variants like MAX6861–MAX6869.

Key Specifications

Pinout & Package

MAX6860UK16D3+ uses a 5-pin SOT23 package with pin 1 internally connected (I.C.) for enhanced noise immunity - must be tied to GND per datasheet recommendation. Unlike MR- or WDI-equipped variants, it lacks manual reset or watchdog inputs, simplifying system integration where only VCC monitoring is required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6860UK16D3+, both alternatives offer longer timeout periods but consume >8× more supply current and lack guaranteed reset validity below 1.5V - making them unsuitable for coin-cell or medical-grade brownout resilience where 170nA I_CC and 1.1V reset guarantee are mandatory.

Availability

MAX6860UK16D3+ is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6860UK16D3+ 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, medical, and communications applications.

MAX6860UK16D3+ belongs to the MAX6854–MAX6869 nanopower supervisory family, designed specifically for battery-critical applications where sub-µA quiescent current, precise low-voltage reset thresholds, and minimal external components are essential.

FAQ

What is the exact reset threshold voltage of MAX6860UK16D3+?

The MAX6860UK16D3+ has a factory-trimmed reset threshold of +1.575V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed by the "16" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is guaranteed valid down to VCC = +1.1V - critical for reliable operation in low-voltage battery systems.

Does MAX6860UK16D3+ include a manual reset input (MR) or watchdog timer (WDI)?

No, MAX6860UK16D3+ does not include MR or WDI functionality. It belongs to the MAX6858/MAX6860 series, which features only VCC monitoring and fixed reset timeout. Pin 3 is GND (not MR), and there is no WDI pin - confirmed by the Selector Guide and Pin Configurations diagram showing pins 1 (I.C.), 2 (GND), 3 (GND), 4 (RESET), and 5 (VCC).

What is the reset timeout period for MAX6860UK16D3+ and how is it set?

The MAX6860UK16D3+ has a fixed 150ms minimum reset timeout period, indicated by the "D3" suffix per Table 4. This timeout is factory-programmed and non-adjustable - unlike MAX6861–MAX6863 variants with CT pin selectability. The actual timeout ranges from 150ms (min) to 300ms (max) depending on process and temperature.

What output type does MAX6860UK16D3+ provide and how is it connected?

MAX6860UK16D3+ provides an active-low push-pull RESET output on pin 4. It requires no external pullup resistor and can directly drive standard CMOS µP reset inputs. The output sinks current when asserted (low) and sources current when deasserted (high), referenced to VCC - enabling robust interfacing without additional components.

Is MAX6860UK16D3+ compatible with lead-free PCB assembly processes?

Yes, MAX6860UK16D3+ is supplied in lead-free packaging - the "+" suffix explicitly denotes RoHS-compliant, lead-free termination. It supports standard reflow profiles for Pb-free soldering (J-STD-020), with a maximum lead temperature of +300°C for 10 seconds, and is rated for operation from -40°C to +85°C.