Analog Devices Inc./Maxim Integrated MAX6864UK16D1S+T

Overview

The MAX6864UK16D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, integrating voltage monitoring (1.575V reset threshold), manual reset input (MR), and watchdog timer (3.3s timeout). 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 reliable power-on reset and firmware crash recovery.

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

Technical Context

This device implements a dual-trigger reset architecture: one path monitors VCC against a precision bandgap-based threshold (±2.5% tolerance), while a second path detects MR assertion or WDI inactivity exceeding 3.3s (typ). The internal reset timeout generator uses a temperature-stable RC oscillator calibrated for 10ms minimum duration after VCC recovery or MR release.

The watchdog circuit clears on any WDI edge (rising or falling) and remains disabled during active RESET assertion. Its 150ns minimum pulse width detection ensures robustness against noise, and it operates across the full VCC range (1.2V–5.5V) without external components.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6864UK16D1S+T, TPS3836K33DBVR omits watchdog protection and offers higher threshold voltage, while MAX6361KA29D3+T trades 10× higher supply current for lower VCC operation-neither matches the unique combination of 1.575V threshold, 3.3s watchdog, and 170nA ICC in SOT23-5.

Availability

MAX6864UK16D1S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power consumer electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6864UK16D1S+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 power management, sensing, and interface applications in industrial, medical, and communications markets.

The MAX6864UK16D1S+T belongs to the nanopower µP supervisory family, engineered specifically for battery-critical applications demanding sub-µA quiescent current, factory-trimmed voltage thresholds, and integrated watchdog safety.

FAQ

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

The MAX6864UK16D1S+T has a factory-trimmed reset threshold of +1.575V, with ±2.5% tolerance over temperature (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "16" corresponds to 1.575V. The device guarantees valid RESET assertion down to VCC = +1.1V, making it suitable for monitoring low-voltage rails in modern ultra-low-power systems.

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

Yes, the MAX6864UK16D1S+T includes a watchdog timer with a typical timeout period of 3.3 seconds, indicated by the "S" suffix in the part number. The watchdog clears on any rising or falling edge at the WDI pin and triggers a reset if WDI remains static beyond this period. Minimum pulse width detection is 150ns, ensuring robust operation in noisy environments.

What is the reset timeout period for the MAX6864UK16D1S+T, and how is it configured?

The MAX6864UK16D1S+T has a fixed minimum reset timeout period of 10ms, denoted by the "D1" suffix. This duration is factory-programmed and non-adjustable. The reset output remains asserted for at least 10ms after VCC rises above 1.575V and MR is deasserted, ensuring sufficient time for microprocessor initialization before release.

What package type and pin configuration does the MAX6864UK16D1S+T use?

The MAX6864UK16D1S+T uses a 5-pin SOT23-5 package with standard pinout: Pin 1 = RESET (active-low push-pull), Pin 2 = GND, Pin 3 = MR (active-low manual reset), Pin 4 = WDI (watchdog input), Pin 5 = VCC. This layout matches the MAX6864/MAX6865/MAX6866 series and is mechanically compatible with TPS383x devices.

How does the MAX6864UK16D1S+T handle supply voltage transients?

The MAX6864UK16D1S+T is designed to reject short VCC transients: it typically ignores 100mV drops lasting ≤40µs, as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph. This immunity prevents false resets during switching regulator noise or load-step events, enhancing system reliability without requiring additional filtering components.