Analog Devices Inc./Maxim Integrated MAX6865UK34D1L+T

Overview

The MAX6865UK34D1L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer functionality. It asserts an active-low push-pull RESET when VCC drops below 3.315V (min), MR is pulled low, or the watchdog times out after 209s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset down to VCC = +1.1V.

For engineers reviewing the MAX6865UK34D1L+T datasheet, MAX6865UK34D1L+T pinout, MAX6865UK34D1L+T application, or MAX6865UK34D1L+T equivalent, key selection criteria include its 3.315V–3.400V factory-trimmed reset threshold, 10ms minimum reset timeout, 209s watchdog period (L-suffix), and compatibility with battery-powered medical and portable electronics requiring robust brownout and code-execution error protection.

Technical Context

This device integrates a precision voltage monitor with ±2.5% threshold accuracy, a glitch-immune manual reset input with 250ns MR-to-reset delay and 1µs minimum pulse width, and a temperature-stable watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). The internal 10kΩ MR pullup eliminates external components.

The reset output is push-pull active-low, referenced to VCC, with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.12V) and guaranteed operation across –40°C to +85°C. Its 170nA typical supply current enables multi-year operation in coin-cell–powered devices without compromising reset validity or watchdog responsiveness.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6865UK34D1L+T, the MAX6864UK34D1L+T offers identical supervision parameters but requires external biasing, while the TPS3836K33DBVR omits watchdog functionality entirely-making MAX6865UK34D1L+T the sole choice for applications demanding both precise 3.3V brownout detection and long-interval firmware crash recovery.

Availability

MAX6865UK34D1L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, industrial handheld terminals, and low-power wearables requiring stable component supply with full lifecycle support.

Supply support for MAX6865UK34D1L+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 interface applications in demanding environments.

The MAX6854–MAX6869 family delivers nanopower supervisory solutions optimized for battery-critical systems where extended runtime, robust reset integrity, and watchdog-enabled firmware reliability are mandatory design requirements.

FAQ

What is the exact reset threshold voltage range for MAX6865UK34D1L+T?

The MAX6865UK34D1L+T has a factory-trimmed reset threshold of 3.315V (min) to 3.400V (max), corresponding to the "34" suffix per Maxim's Threshold Suffix Guide. This range is specified at TA = –40°C to +85°C with ±2.5% tolerance, ensuring precise supervision of nominal 3.3V rails without external calibration. The threshold remains stable across temperature, with normalized variation ≤ ±0.5% from –40°C to +85°C.

Does MAX6865UK34D1L+T include a watchdog timer, and what is its timeout behavior?

Yes, MAX6865UK34D1L+T includes a watchdog timer with L-suffix configuration, providing a typical timeout of 209s (min 95s, max 487s). The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this period. When triggered, it asserts the same RESET output for the configured 10ms minimum timeout, ensuring coordinated hardware recovery alongside voltage-based reset events.

What is the supply current specification of MAX6865UK34D1L+T under normal operating conditions?

The MAX6865UK34D1L+T draws 170nA typical supply current (ICC) when VCC > VTH and reset is deasserted, measured at VCC = 1.8V and TA = +25°C. This ultralow quiescent current is maintained across the full operating temperature range (–40°C to +85°C) and supply range (1.2V to 5.5V), enabling multi-year operation in coin-cell–powered applications such as glucose monitors and wireless sensors.

How does the manual reset (MR) input function on MAX6865UK34D1L+T?

The MR input on MAX6865UK34D1L+T is an active-low, internally pulled up (10kΩ to VCC) pin that initiates reset when driven low. Reset remains asserted while MR is low and for the full 10ms minimum timeout after MR returns high. It accepts CMOS-compatible logic levels, tolerates 1µs minimum pulse width, and rejects glitches <200ns-enabling direct connection to momentary switches or digital outputs without external debounce circuitry.

What package type and lead finish does MAX6865UK34D1L+T use?

MAX6865UK34D1L+T is supplied in a 5-pin SOT23-5 package with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix. The package measures 2.9mm × 1.6mm × 1.1mm and is optimized for high-density PCB layouts in space-constrained portable electronics. Thermal performance supports continuous operation at +85°C ambient with standard reflow profiles.