Analog Devices Inc./Maxim Integrated MAX6855UK34D6+T

Overview

The MAX6855UK34D6+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 3.4V reset threshold (±2.5%), and a 600ms minimum reset timeout period. It provides active-low push-pull reset output, manual reset input (MR), and operates across -40°C to +85°C - designed for reliable power-on reset and brownout protection in battery-critical systems like glucose monitors and portable medical devices.

For engineers reviewing the MAX6855UK34D6+T datasheet, MAX6855UK34D6+T pinout, MAX6855UK34D6+T application, or MAX6855UK34D6+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official electrical characteristics and functional descriptions.

Technical Context

The MAX6855UK34D6+T integrates voltage monitoring, manual reset assertion, and reset timing logic - but excludes watchdog timer and CT-select functionality (confirmed by Selector Guide and Pin Description tables). Its reset output remains asserted for ≥600ms after VCC rises above 3.4V and MR deasserts, with guaranteed validity down to VCC = +1.1V and immunity to ≤40µs VCC transients at 100mV overdrive.

This variant uses an active-low push-pull RESET output referenced to VCC, internal 10kΩ MR pullup, and no external components required. It asserts reset when VCC falls below 3.4V or MR is driven low, and deasserts only after both conditions clear and the full timeout elapses - ensuring deterministic µP initialization in low-power embedded systems.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, surface-mount, lead-free (indicated by "+T" suffix), footprint-compatible with industry-standard 5-lead SOT23 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K33DBVR and MAX6369KA29D3+T, the MAX6855UK34D6+T uniquely combines 3.4V threshold accuracy, 600ms timeout, manual reset support, and nanopower 170nA operation - making it the sole option for long-life, user-serviceable 3.3V medical devices requiring deterministic reset behavior under brownout.

Availability

MAX6855UK34D6+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, and wireless pulse oximeters requiring stable component supply across extended production lifecycles and global regulatory submissions.

Supply support for MAX6855UK34D6+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 demanding industrial, medical, and communications applications - emphasizing low-power operation, high reliability, and small-footprint integration.

The MAX6855UK34D6+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-constrained portable medical and handheld electronics where multi-year operation and deterministic reset timing are non-negotiable design requirements.

FAQ

What is the exact reset threshold voltage of the MAX6855UK34D6+T?

The MAX6855UK34D6+T has a factory-trimmed reset threshold voltage of 3.4V, with guaranteed tolerance of ±2.5% over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "34" corresponds to 3.4V nominal, and in Electrical Characteristics where VTH is specified as VTH ±2.5%. The MAX6855UK34D6+T maintains this accuracy without external calibration.

Does the MAX6855UK34D6+T include a watchdog timer?

No, the MAX6855UK34D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; the MAX6855UK34D6+T is explicitly listed without WDI or watchdog functionality. Its supervision is limited to VCC monitoring and manual reset - confirmed by absence of WDI pin and watchdog timing parameters in its specification table.

What is the reset output configuration of the MAX6855UK34D6+T?

The MAX6855UK34D6+T features an active-low push-pull reset output (RESET), as confirmed in the MAX6854/MAX6855/MAX6856 Pin Description table and Selector Guide. Pin 1 is labeled RESET with function "Active-Low Push-Pull Reset Output", and the device drives low during reset assertion without requiring an external pullup resistor - distinguishing it from open-drain or active-high variants.

What is the minimum reset timeout period for the MAX6855UK34D6+T?

The MAX6855UK34D6+T has a minimum reset timeout period of 600ms, indicated by suffix "D6" per Table 4 (Reset Timeout Periods). Electrical Characteristics confirm tRP = 600ms (min), 900ms (typ), 1200ms (max) under VCC = VTH + 150mV. This timeout begins after VCC exceeds 3.4V and MR deasserts, ensuring robust hold time for slow peripherals.

Is the MAX6855UK34D6+T pin-compatible with other SOT23-5 supervisors?

Yes, the MAX6855UK34D6+T uses a standard 5-pin SOT23-5 package with pin 1 = RESET, pins 2 & 4 = GND, pin 3 = MR, and pin 5 = VCC - matching the mechanical footprint and basic connectivity of TPS3836/TPS3837/TPS3838 (as noted in Features). However, electrical compatibility requires verification of reset polarity, threshold, and timeout - since pinout alone does not guarantee functional interchangeability.