Analog Devices Inc./Maxim Integrated MAX6854UK16D4+T

Overview

The MAX6854UK16D4+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.575V reset threshold (suffix '16'), and 1200ms minimum reset timeout (suffix 'D4'). It monitors VCC, asserts active-low reset on undervoltage or manual reset, and guarantees valid reset output down to VCC = +1.1V. It is used in battery-powered glucose monitors and portable medical devices requiring long-term power integrity.

For engineers reviewing the MAX6854UK16D4+T datasheet, MAX6854UK16D4+T pinout, MAX6854UK16D4+T application, or MAX6854UK16D4+T equivalent, key selection criteria include its 1.575V threshold accuracy, 1200ms timeout stability over temperature, open-drain/push-pull reset output options, and immunity to sub-40µs VCC transients - all critical for low-power embedded system reliability validation.

Technical Context

This device implements a precision bandgap-based voltage monitor with 2.5% threshold tolerance and 0.5% hysteresis, coupled to a digitally timed reset delay generator. Its internal 10kΩ MR pullup enables direct switch interfacing without external components, while guaranteed operation down to VCC = 1.1V ensures robustness during brownout recovery.

The reset assertion logic combines three independent triggers: VCC falling below VTH, MR pin pulled low, or (in watchdog variants) WDI timeout - though MAX6854UK16D4+T excludes watchdog functionality per selector guide and pin configuration. Reset deassertion follows a fixed 1200ms timeout after VCC exceeds VTH and MR releases.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), 2.9mm × 1.6mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6854UK16D4+T, TPS3836K33DBVR offers higher threshold accuracy but lacks the 1.575V option essential for low-voltage medical sensors, while MAX6361KA29D3+T trades 7× higher ICC for faster timeout - making MAX6854UK16D4+T optimal for ultra-long-life, sub-1.8V applications.

Availability

MAX6854UK16D4+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and portable pulse oximeters requiring stable component supply across extended production lifecycles and global regulatory compliance.

Supply support for MAX6854UK16D4+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, sensing, and interface applications in industrial, medical, and communications systems.

The MAX68xx family targets ultra-low-power microprocessor supervision in battery-critical applications, emphasizing nanoscale ICC, wide VCC range, and guaranteed reset behavior down to 1.1V for medical and portable safety-critical systems.

FAQ

What is the exact reset threshold voltage of the MAX6854UK16D4+T?

The MAX6854UK16D4+T has a factory-trimmed reset threshold of +1.575V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix '16' explicitly maps to 1.575V. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for monitoring deeply scaled logic rails.

Does the MAX6854UK16D4+T include a watchdog timer function?

No, the MAX6854UK16D4+T does not include a watchdog timer. Per the Selector Guide and Pin Configurations section, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout logic. The MAX6854UK16D4+T belongs to the base supervisory group with VCC monitoring and manual reset only - confirmed by absence of WDI pin and watchdog-related electrical characteristics in its parameter tables.

What reset output type does the MAX6854UK16D4+T provide?

The MAX6854UK16D4+T provides an active-low reset output that can be configured as either push-pull or open-drain, as stated in the General Description and Pin Description sections. Pin 1 is labeled RESET and supports both topologies; open-drain mode requires an external pullup resistor, while push-pull mode drives high/low directly referenced to VCC.

What is the minimum reset timeout period for the MAX6854UK16D4+T?

The MAX6854UK16D4+T has a minimum reset timeout period of 1200ms, corresponding to suffix 'D4' per Table 4 (Reset Timeout Periods). This is a fixed timeout - unlike MAX6861–MAX6863, it does not support pin-selectable delays. The 1200ms duration ensures reliable µP and peripheral initialization in resource-constrained medical devices.

Is the MAX6854UK16D4+T pin-compatible with other supervisory ICs?

Yes, the MAX6854UK16D4+T is pin-compatible with the TPS3836/TPS3837/TPS3838 family per the Features section, sharing identical 5-pin SOT23-5 layout and functional pin assignments (VCC, GND, MR, RESET, GND). This enables direct substitution in existing designs without PCB revision, provided reset threshold and timeout requirements align.