Analog Devices Inc./Maxim Integrated MAX6864UK16D1S+

Overview

The MAX6864UK16D1S+ from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (1.575V reset threshold), manual reset input (MR), and watchdog timer (3.3s timeout) for embedded power management. It asserts an active-low push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, with guaranteed validity down to VCC = +1.1V. It targets ultra-low-power portable medical and consumer devices requiring robust startup/brownout protection.

For engineers reviewing the MAX6864UK16D1S+ datasheet, MAX6864UK16D1S+ pinout, MAX6864UK16D1S+ application, or MAX6864UK16D1S+ equivalent, key selection criteria include its 170nA typical supply current, factory-trimmed 1.575V reset threshold, 10ms minimum reset timeout, 3.3s watchdog period, and SOT23-5 footprint compatibility with TPS383x series.

Technical Context

The MAX6864UK16D1S+ integrates a precision voltage monitor with ±2.5% threshold accuracy, a glitch-immune manual reset input with 1µs minimum pulse width and 200ns noise rejection, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Its internal 10kΩ MR pullup eliminates external components.

Reset assertion is guaranteed valid down to VCC = +1.1V, and the push-pull active-low RESET output sinks ≥50µA at 0.3V with VCC ≥ 1.1V. The device operates across -40°C to +85°C and draws only 170nA (typ) at VCC = 1.8V, enabling multi-year battery life in always-on systems.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K33DBVR and MAX6361KA29D3+, the MAX6864UK16D1S+ uniquely delivers integrated watchdog supervision with nanopower consumption, enabling long-life, safety-critical portable electronics where both voltage monitoring and firmware health checking are mandatory.

Availability

MAX6864UK16D1S+ is available at Aetrix Electronics and suitable for portable medical devices, battery-powered wearables, and wireless sensor nodes requiring stable component supply and long-term lifecycle support.

Supply support for MAX6864UK16D1S+ 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX6864UK16D1S+ belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-low-power portable electronics requiring simultaneous voltage monitoring, manual reset, and watchdog timer functions in minimal footprint.

FAQ

What is the exact reset threshold voltage of the MAX6864UK16D1S+?

The MAX6864UK16D1S+ has a factory-trimmed reset threshold voltage of +1.575V, with ±2.5% tolerance over the -40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "16" corresponds to 1.575V. The MAX6864UK16D1S+ maintains this accuracy without external calibration, making it suitable for low-voltage 1.8V systems.

Does the MAX6864UK16D1S+ include a watchdog timer, and what is its timeout period?

Yes, the MAX6864UK16D1S+ includes a watchdog timer with a typical timeout period of 3.3 seconds, denoted by the "S" suffix in its part number. The timer resets on any rising or falling edge at the WDI pin and triggers a reset if WDI remains static beyond this period. This 3.3s timeout is optimized for firmware loops that execute within several seconds, preventing silent hangs in battery-constrained devices using the MAX6864UK16D1S+.

What type of reset output does the MAX6864UK16D1S+ provide, and how is it configured?

The MAX6864UK16D1S+ provides an active-low push-pull reset output on Pin 1. Unlike open-drain variants, this configuration eliminates the need for an external pullup resistor, reducing BOM cost and PCB area. The output sinks ≥50µA at 0.3V when asserted and sources ≥200µA at 0.8×VCC when deasserted, ensuring robust interfacing with standard CMOS inputs across its 1.2V–5.5V operating range.

What is the minimum reset timeout period for the MAX6864UK16D1S+?

The MAX6864UK16D1S+ has a minimum reset timeout period of 10ms, indicated by the "D1" suffix in its part number. This fixed timeout ensures sufficient hold time for microcontroller internal registers and memory to stabilize after power-up or brownout recovery. The 10ms duration is validated across temperature and voltage extremes, guaranteeing reliable release timing for fast-boot MCUs used with the MAX6864UK16D1S+.

Is the MAX6864UK16D1S+ pin-compatible with other supervisory ICs?

The MAX6864UK16D1S+ uses a standard 5-pin SOT23-5 package and shares pinout compatibility with the TPS3836/TPS3837/TPS3838 family for RESET, GND, MR, WDI, and VCC connections. However, functional differences exist - notably the MAX6864UK16D1S+ includes watchdog capability while TPS3836 variants do not. PCB layout reuse is feasible, but firmware integration must account for WDI signal routing and watchdog servicing requirements in the MAX6864UK16D1S+.