Analog Devices Inc./Maxim Integrated MAX6865UK17D2S+T

Overview

MAX6865UK17D2S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.665V reset threshold (suffix '17'), 40ms minimum reset timeout (suffix 'D2'), and integrated watchdog timer with 3.3s typical timeout (suffix 'S'). It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout, power-up, or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.

For engineers reviewing the MAX6865UK17D2S+T datasheet, MAX6865UK17D2S+T pinout, MAX6865UK17D2S+T application, or MAX6865UK17D2S+T equivalent, this page delivers verified electrical specs, functional pin roles, real-world use cases, and validated alternative parts for low-power embedded system design and BOM optimization.

Technical Context

The MAX6865UK17D2S+T implements a precision bandgap-based voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, guaranteed reset validity down to VCC = +1.1V. Its watchdog timer clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ), supporting fail-safe recovery in firmware-hung microcontrollers.

This device integrates MR input with 10kΩ internal pullup, glitch rejection of 200ns, and MR-to-reset delay of 250ns. The active-high push-pull RESET output sources ≥500µA at VCC ≥ 2.38V (VOH ≥ 0.8×VCC) and sinks ≤0.3V under 1.2mA load, eliminating need for external pullups or level shifters.

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 MAX6865UK17D2S+T, MAX6864UK16D2S+T offers a slightly lower reset threshold for tighter 1.8V rail control, while TPS3836K33DBVR provides simpler voltage monitoring without watchdog - neither is pin-compatible nor functionally equivalent, requiring design review for substitution.

Availability

MAX6865UK17D2S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered diagnostics equipment, and low-power wireless sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX6865UK17D2S+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX6865UK17D2S+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-low-power, space-constrained battery-operated systems where long service life and fail-safe firmware recovery are critical.

FAQ

What is the exact reset threshold voltage of MAX6865UK17D2S+T?

The MAX6865UK17D2S+T has a factory-trimmed reset threshold of 1.665V (±2.5%), corresponding to suffix '17' per Maxim's Threshold Suffix Guide. This value is guaranteed over -40°C to +85°C and ensures reliable detection of brownout on 1.8V rails. The MAX6865UK17D2S+T maintains reset assertion until VCC rises above 1.665V and holds it for 40ms thereafter.

Does MAX6865UK17D2S+T support active-high or active-low reset output?

The MAX6865UK17D2S+T features an active-high push-pull RESET output (pin 1), which transitions high during fault conditions and deasserts low after the 40ms timeout. This is confirmed by its MAX6865 designation and pin description in the datasheet. The MAX6865UK17D2S+T does not offer open-drain or active-low variants - those are assigned to other members of the family (e.g., MAX6866).

What is the watchdog timeout behavior of MAX6865UK17D2S+T?

The MAX6865UK17D2S+T implements a watchdog timer with 3.3s typical timeout (suffix 'S'), clearing on any rising or falling edge at WDI (pin 4). If WDI remains static beyond this period, RESET asserts high for 40ms. The MAX6865UK17D2S+T guarantees edge detection for pulses ≥150ns and rejects glitches <200ns, ensuring robust operation in noisy environments.

Can MAX6865UK17D2S+T operate down to 1.2V supply voltage?

Yes, the MAX6865UK17D2S+T operates across VCC = 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.1V. At 1.2V, it draws only 190nA (typ), maintaining full supervisory functionality including MR response, watchdog monitoring, and reset timing accuracy - critical for energy-harvesting and ultra-low-voltage medical sensors.

Is MAX6865UK17D2S+T pin-compatible with other MAX68xx devices?

The MAX6865UK17D2S+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864, MAX6866, MAX6867, MAX6868, and MAX6869 (RESET–GND–MR–WDI–VCC). However, it is not pin-compatible with MAX6861/MAX6862/MAX6863 (which use CT instead of WDI) or MAX6854/MAX6855/MAX6856 (which lack WDI). Always verify pin function alignment before substitution.