Analog Devices Inc./Maxim Integrated MAX6855UK30D6+T

Overview

The MAX6855UK30D6+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 3.000V reset threshold (suffix "30"), and 600ms–1200ms minimum reset timeout (suffix "D6"). It provides active-low push-pull reset output, manual reset input (MR), and operates across –40°C to +85°C for battery-powered medical and portable electronics.

For engineers reviewing the MAX6855UK30D6+T datasheet, MAX6855UK30D6+T pinout, MAX6855UK30D6+T application, or MAX6855UK30D6+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), no external components required, and compatibility with CMOS-level MR signaling.

Technical Context

This device integrates voltage monitoring, manual reset assertion, and reset timing control - but excludes watchdog timer functionality (absent in MAX6855 family members). Its internal 10kΩ MR pullup enables direct switch-to-GND implementation without external biasing.

The reset output remains asserted for ≥600ms after VCC rises above 3.000V and MR deasserts, with tRD < 40µs during VCC fall and tMRD = 250ns from MR low-to-reset assertion. Reset threshold hysteresis is ±0.5% of VTH, ensuring stable release under noisy supply conditions.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable 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 TPS3836K33DBVR and STM6315RWX6F, the MAX6855UK30D6+T delivers 10× lower supply current and tighter threshold accuracy - making it uniquely suited for decade-long deployments in medical wearables and remote sensors where every nanoamp matters.

Availability

MAX6855UK30D6+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered test equipment, and low-power IoT edge nodes requiring stable component supply with full traceability and lifecycle management.

Supply support for MAX6855UK30D6+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 MAX6854–MAX6869 family targets ultra-low-power supervisory functions in space- and energy-constrained systems - emphasizing nanopower operation, guaranteed reset behavior down to 1.1V, and robustness against supply transients.

FAQ

What is the exact reset threshold voltage of the MAX6855UK30D6+T?

The MAX6855UK30D6+T has a factory-trimmed reset threshold of 3.000V, 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 "30" corresponds to 2.925V (min), 3.000V (typ), and 3.075V (max). The MAX6855UK30D6+T uses this precise threshold to reliably monitor 3.0V rails in portable medical devices.

Does the MAX6855UK30D6+T include a watchdog timer?

No, the MAX6855UK30D6+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants integrate WDI functionality. The MAX6855UK30D6+T provides voltage monitoring, manual reset (MR), and fixed reset timeout - making it ideal for applications requiring simplicity and lowest possible ICC without watchdog supervision.

What is the function of Pin 4 on the MAX6855UK30D6+T?

Pin 4 on the MAX6855UK30D6+T is a second GND terminal, electrically tied to Pin 2 (GND). Both ground pins must be connected to the same low-impedance ground plane to ensure noise immunity and accurate reset timing. This dual-GND configuration reduces ground bounce effects during reset assertion and improves stability in high-noise portable environments where the MAX6855UK30D6+T is commonly deployed.

Can the MAX6855UK30D6+T operate from a 1.8V supply?

Yes, the MAX6855UK30D6+T operates from 1.2V to 5.5V, including 1.8V. Its reset output remains valid down to VCC = +1.1V, and supply current is specified at 170nA typical at VCC = 1.8V. This makes the MAX6855UK30D6+T suitable for modern ultra-low-voltage µPs and SoCs, such as those used in hearing aids and neural sensors, where 1.8V operation is standard.

Is the MAX6855UK30D6+T pin-compatible with other devices in the MAX68xx family?

The MAX6855UK30D6+T shares the same 5-pin SOT23-5 package and pinout (RESET–GND–MR–GND–VCC) with MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869. However, output polarity and feature sets differ: MAX6855 offers active-high push-pull RESET, while MAX6855UK30D6+T is active-low. Always verify reset polarity and feature presence (e.g., CT, WDI) before substitution - the MAX6855UK30D6+T is not a drop-in replacement for MAX6855 variants with different suffixes.