Analog Devices Inc./Maxim Integrated MAX6864UK16D1L+T

Overview

The MAX6864UK16D1L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.575V reset threshold (suffix "16"), 10ms minimum reset timeout (suffix "D1"), and 209s typical watchdog timeout (suffix "L"). It monitors VCC, responds to manual reset (MR) assertion, and triggers reset upon watchdog timer expiration - used in battery-powered medical and portable electronics for reliable power-on and brownout recovery.

For engineers reviewing the MAX6864UK16D1L+T datasheet, MAX6864UK16D1L+T pinout, MAX6864UK16D1L+T application, or MAX6864UK16D1L+T equivalent, key selection criteria include its 1.575V reset threshold accuracy, 209s watchdog timeout stability over temperature, guaranteed reset validity down to VCC = +1.1V, and compatibility with low-voltage µP systems requiring <200nA quiescent current.

Technical Context

The MAX6864UK16D1L+T integrates a precision voltage monitor, a manual reset input with 250ns MR-to-reset delay and 1µs minimum pulse width, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust operation in noisy environments without external components.

It uses a BiCMOS process with 2848 transistors and operates across –40°C to +85°C. The device asserts an active-low push-pull RESET output when VCC drops below 1.575V, MR is pulled low, or the watchdog times out - holding RESET asserted for ≥10ms after recovery. Reset deassertion is guaranteed valid down to VCC = +1.1V.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, surface-mount. Footprint compatible with industry-standard 5-pin SOT23 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6864UK16D1L+T uniquely delivers nanopower operation (170nA), programmable watchdog timeout (209s), and precise 1.575V threshold - making it irreplaceable in ultra-low-power medical and long-life IoT applications requiring autonomous fault recovery.

Availability

MAX6864UK16D1L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and industrial handhelds requiring stable component supply with full traceability and lifecycle support.

Supply support for MAX6864UK16D1L+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 high-performance analog and mixed-signal ICs for power, sensing, and timing applications in industrial, medical, and communications markets.

The MAX6864UK16D1L+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-critical applications demanding sub-200nA ICC, guaranteed reset validity below 1.2V, and integrated watchdog protection without external components.

FAQ

What is the exact reset threshold voltage of the MAX6864UK16D1L+T?

The MAX6864UK16D1L+T has a factory-trimmed reset threshold voltage of +1.575V, with ±2.5% tolerance over the full –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 nominal. The device guarantees valid reset assertion down to VCC = +1.1V, enabling reliable operation near end-of-battery voltage.

Does the MAX6864UK16D1L+T support both push-pull and open-drain reset outputs?

No - the MAX6864UK16D1L+T features an active-low push-pull RESET output only, as confirmed by its pin configuration (Pin 1 = RESET, functional description states "Active-Low Push-Pull Reset Output") and Selector Guide entry. It does not offer open-drain or active-high variants. The push-pull output eliminates the need for an external pullup resistor and sinks 50µA at VCC ≥1.1V, ensuring robust drive into µP reset inputs.

What is the watchdog timeout behavior of the MAX6864UK16D1L+T, and how is it cleared?

The MAX6864UK16D1L+T provides a 209s typical watchdog timeout (L-suffix), with min/max of 95s/487s. The internal watchdog timer clears on any rising or falling edge at the WDI pin, or when RESET is asserted (e.g., during power-up or MR activation). It does not clear on VCC transitions alone. The timer resumes counting immediately after RESET deasserts, ensuring continuous supervision of firmware execution flow.

Can the MAX6864UK16D1L+T operate from a 1.2V supply?

Yes - the MAX6864UK16D1L+T operates across VCC = 1.2V to 5.5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.2V, it maintains guaranteed reset functionality (VCC ≥1.1V), though supply current rises to 7–15µA (reset asserted) and reset timeout accuracy may degrade slightly. For optimal 170nA ICC performance, VCC ≥1.8V is recommended.

Is the MAX6864UK16D1L+T pin-compatible with other devices in the MAX68xx family?

The MAX6864UK16D1L+T shares the same 5-pin SOT23-5 package and pinout (VCC, WDI, MR, GND, RESET) with MAX6864/MAX6865/MAX6866 variants, as shown in the Pin Configurations diagram. It is not pin-compatible with MAX6861–MAX6863 (which use CT instead of WDI) or MAX6854–MAX6856 (which lack WDI). Direct substitution is only valid among MAX6864/65/66 derivatives with identical pin function mapping.