Analog Devices Inc./Maxim Integrated MAX6865UK17D6S+T

Overview

The MAX6865UK17D6S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 1.665V reset threshold (suffix '17'), 1200ms minimum reset timeout (suffix 'D6'), and integrated watchdog timer with 3.3s typical timeout (suffix 'S'). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog expiration - designed for battery-critical applications like glucose monitors and portable medical devices.

For engineers reviewing the MAX6865UK17D6S+T datasheet, MAX6865UK17D6S+T pinout, MAX6865UK17D6S+T application, or MAX6865UK17D6S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-high RESET output, and compatibility with noisy low-power systems requiring precise voltage supervision and code-execution safety.

Technical Context

This device belongs to the MAX6864–MAX6869 family, which integrates three core functions: precision VCC monitoring with hysteresis (0.5% of VTH), 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 3.3s (typ).

The MAX6865UK17D6S+T uses internal BiCMOS process technology (2848 transistors) and features an internally pulled-up MR input (10kΩ), no external components required, and operates across –40°C to +85°C. Its push-pull active-high RESET output delivers VOH ≥ 0.8×VCC (at ISOURCE = 500µA) and VOL ≤ 0.3V (at ISINK = 1.2mA), ensuring robust logic-level compatibility with µP reset inputs.

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 MAX6864UK17D6S+T and TPS3837K33DBVR, the MAX6865UK17D6S+T uniquely delivers nanopower consumption, active-high reset polarity, and integrated watchdog - making it the only option for certified medical devices requiring both low quiescent current and fail-safe firmware monitoring.

Availability

MAX6865UK17D6S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and industrial handheld scanners requiring stable component supply across long production lifecycles and stringent environmental qualification.

Supply support for MAX6865UK17D6S+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, with emphasis on high-reliability, low-power solutions.

The MAX6864–MAX6869 product line was engineered specifically for battery-powered medical and portable electronics, delivering nanopower supervision with integrated watchdog functionality to meet IEC 62304 and ISO 13485 design assurance requirements.

FAQ

What is the exact reset threshold voltage of the MAX6865UK17D6S+T?

The MAX6865UK17D6S+T has a factory-trimmed reset threshold voltage of 1.665V, with ±2.5% tolerance over the full –40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix '17' corresponds to 1.665V nominal. The MAX6865UK17D6S+T guarantees valid reset assertion down to VCC = +1.1V, making it suitable for deep-brownout detection in 1.8V systems.

Does the MAX6865UK17D6S+T require external components for basic operation?

No, the MAX6865UK17D6S+T requires no external components for core functionality: it integrates a 10kΩ internal pullup on MR, a precision voltage reference, reset timeout oscillator, and watchdog timer. Only a 0.1µF ceramic bypass capacitor on VCC is recommended for noise immunity. The MAX6865UK17D6S+T's push-pull active-high RESET output eliminates the need for external pullup resistors, simplifying layout and reducing BOM count.

How does the watchdog timer in the MAX6865UK17D6S+T respond to software activity?

The MAX6865UK17D6S+T watchdog timer clears on every rising or falling edge at the WDI pin and expires only if WDI remains static for >3.3s (typ). It does not require periodic toggling - a single edge suffices to reset the timer. During reset assertion, the watchdog is disabled; it resumes counting immediately upon reset deassertion. This behavior ensures the MAX6865UK17D6S+T catches true firmware hangs without demanding strict timing discipline from the host µP.

Can the MAX6865UK17D6S+T operate reliably at VCC = 1.2V?

Yes, the MAX6865UK17D6S+T is fully specified to operate from VCC = 1.2V to 5.5V. At 1.2V, its supply current remains ultra-low (≤400nA), and reset output validity is guaranteed per datasheet Electrical Characteristics. However, RESET output high-level voltage (VOH) drops to ≥0.8×VCC = 0.96V at ISOURCE = 500µA - verify compatibility with the host µP's reset input high-threshold specification. The MAX6865UK17D6S+T maintains full functionality including MR and WDI response at 1.2V.

What is the meaning of the 'D6S' suffix in MAX6865UK17D6S+T?

In MAX6865UK17D6S+T, 'D6' denotes the reset timeout period option: D6 = 600ms to 1200ms (minimum 600ms), and 'S' specifies the watchdog timeout variant: S = 1.5s to 7.75s (typical 3.3s). These suffixes follow Maxim's standardized ordering convention defined in Tables 3 and 4 of the datasheet. The 'UK17' portion indicates the 1.665V reset threshold, and '+T' confirms lead-free packaging. All elements are factory-configured and non-adjustable.