Analog Devices Inc./Maxim Integrated MAX6854UK27D1+T

Overview

The MAX6854UK27D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 10ms minimum reset timeout. It asserts an active-low open-drain RESET output when VCC drops below its factory-trimmed 2.700V threshold (±2.5%), during MR assertion, or after power-up/brownout - ensuring reliable µP initialization in battery-powered medical and portable electronics.

For engineers reviewing the MAX6854UK27D1+T datasheet, MAX6854UK27D1+T pinout, MAX6854UK27D1+T application, or MAX6854UK27D1+T equivalent, this device delivers ultra-low 170nA typical supply current, guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and no external components required - critical for space- and power-constrained designs.

Technical Context

This supervisory IC integrates a precision voltage comparator with hysteresis (0.5% of VTH), a monolithic reset timeout generator (10ms min), and a CMOS-compatible manual reset input with 10kΩ internal pullup and 1µs minimum pulse width. Its open-drain RESET output supports level-shifting up to 5.5V and remains valid across –40°C to +85°C.

The device operates from 1.2V to 5.5V supply, draws only 7–15µA when reset is asserted, and features guaranteed reset assertion even as VCC falls to +1.1V - enabling robust brownout detection in low-voltage systems where traditional supervisors fail.

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 PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K27DBVR and ADM6806-27ARTZ-R7, the MAX6854UK27D1+T uniquely combines 2.7V threshold, 10ms timeout, open-drain output, and sub-200nA ICC - making it optimal for multi-year battery life in compact medical and consumer wearables.

Availability

MAX6854UK27D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, MP3 players, and wireless pagers requiring stable component supply with long-term lifecycle support and consistent lead-free packaging.

Supply support for MAX6854UK27D1+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 MAX6854UK27D1+T belongs to the nanopower µP supervisory family, engineered specifically for ultra-low-power, space-constrained portable and medical electronics requiring guaranteed reset under brownout and transient conditions.

FAQ

What is the exact reset threshold voltage of the MAX6854UK27D1+T?

The MAX6854UK27D1+T has a factory-trimmed reset threshold of 2.700V 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 "27" corresponds to 2.700V nominal. The device guarantees reset assertion when VCC falls below this threshold and deassertion only after VCC rises above it plus hysteresis (0.5% of VTH).

Does the MAX6854UK27D1+T include a watchdog timer function?

No, the MAX6854UK27D1+T does not include a watchdog timer. It is part of the MAX6854/MAX6855/MAX6856 series, which provide only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to the MAX6864–MAX6869 variants - confirmed in the Selector Guide and Pin Configurations section of the datasheet.

What is the reset timeout period for the MAX6854UK27D1+T?

The MAX6854UK27D1+T has a fixed minimum reset timeout period of 10ms, indicated by the "D1" suffix in its part number. This is verified in Table 4 (Reset Timeout Periods), where D1 specifies 10ms (min), 15ms (typ), and 25ms (max). The timeout begins after VCC rises above the reset threshold and MR is deasserted, and is implemented entirely on-chip with no external components.

Can the MAX6854UK27D1+T operate with a supply voltage below 1.2V?

No - the MAX6854UK27D1+T has a specified minimum operating supply voltage of 1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. While its RESET output remains valid down to VCC = +1.1V (ensuring clean reset assertion during brownout), the device itself requires ≥1.2V to function correctly and maintain internal biasing and timing accuracy.

Is the MAX6854UK27D1+T pin-compatible with other devices in the MAX68xx family?

The MAX6854UK27D1+T shares the same 5-pin SOT23-5 pinout as MAX6854/MAX6855/MAX6856 variants (Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = GND, Pin 5 = VCC), but is not pin-compatible with MAX6858/MAX6860 (which use Pins 1&2 for I.C.) or MAX6864–MAX6869 (which replace Pin 3 with WDI). Compatibility must be verified per the Pin Configurations diagram and Selector Guide.