Analog Devices Inc./Maxim Integrated MAX6855UK32D5+T

Overview

The MAX6855UK32D5+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 3.2V reset threshold (±2.5%), and 450ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C for reliable power-up/brownout monitoring in battery-powered medical and portable electronics.

For engineers reviewing the MAX6855UK32D5+T datasheet, MAX6855UK32D5+T pinout, MAX6855UK32D5+T application, or MAX6855UK32D5+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, real-world use cases, and validated alternative options - all grounded in Maxim's official documentation and electrical specifications.

Technical Context

The MAX6855UK32D5+T implements a precision voltage monitor with hysteresis (0.5% of V_TH) and guarantees valid reset assertion down to V_CC = 1.1V. Its MR input features 10kΩ internal pullup, 1µs minimum pulse width, and 200ns glitch rejection - enabling robust manual reset initiation without external components.

This variant belongs to the MAX6854–MAX6869 family but excludes watchdog timer (WDI) and CT select functionality. It delivers active-high push-pull RESET with VOH ≥ 0.8×V_CC (at ISOURCE = 500µA) and VOL ≤ 0.3V (at ISINK = 1.2mA), supporting direct interface to µP reset inputs without level-shifting.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height - optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3837K33DBVR and ADM6805-3ARTZ-RL7, the MAX6855UK32D5+T offers the lowest ICC (170nA vs. >1µA), longest standard timeout (450ms), and active-high push-pull output - reducing component count and extending battery life in space- and power-constrained portable medical devices.

Availability

MAX6855UK32D5+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6855UK32D5+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX6854–MAX6869 product line was designed specifically for ultra-low-power microprocessor supervision in battery-critical applications - delivering nanopower operation, factory-trimmed thresholds, and integrated reset timing without external components.

FAQ

What is the exact reset threshold voltage of the MAX6855UK32D5+T?

The MAX6855UK32D5+T has a factory-trimmed reset threshold of 3.200V 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 "32" corresponds to V_TH = 3.2V. The MAX6855UK32D5+T maintains this specification across its full operating range without external calibration.

Does the MAX6855UK32D5+T include a watchdog timer function?

No, the MAX6855UK32D5+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input functionality. The MAX6855UK32D5+T is a manual-reset-only supervisory circuit with MR input and active-high push-pull RESET output - confirmed by its absence in the WDI column of the Selector Guide.

What is the reset timeout period for the MAX6855UK32D5+T?

The MAX6855UK32D5+T has a minimum reset timeout period of 450ms, corresponding to the "D5" suffix in its part number. This is verified in Table 4 (Reset Timeout Periods), where D5 specifies 300ms (min), 450ms (typ), and 600ms (max). The actual timeout is guaranteed ≥450ms after V_CC rises above 3.2V and MR is deasserted.

Can the MAX6855UK32D5+T operate with a 1.8V supply?

Yes, the MAX6855UK32D5+T operates with V_CC from 1.2V to 5.5V, including 1.8V. Its 170nA typical supply current is specified at V_CC = 1.8V, and RESET output remains valid down to V_CC = 1.1V. At 1.8V, VOH ≥ 0.8×V_CC = 1.44V and VOL ≤ 0.3V meet standard 1.8V logic thresholds for driving compatible µP reset inputs.

Is the MAX6855UK32D5+T pin-compatible with other devices in the MAX68xx family?

The MAX6855UK32D5+T shares the same 5-pin SOT23-5 package and pinout as MAX6854/MAX6856/MAX6858/MAX6860–MAX6869 variants, but pin compatibility does not imply functional equivalence. While Pin 1 (RESET), Pin 2 (GND), Pin 3 (MR), Pin 4 (GND), and Pin 5 (V_CC) are identical, the MAX6855UK32D5+T's active-high push-pull RESET differs from open-drain or active-low variants - requiring schematic verification before substitution.