Analog Devices Inc./Maxim Integrated MAX6804US46D2+

Overview

MAX6804US46D2+ from Maxim Integrated is a 4-pin SOT143 push/pull active-low microprocessor supervisory circuit designed for precise power supply monitoring in embedded systems. It asserts reset when V_CC falls below 4.63V (±3% over temperature) or upon manual reset, with a guaranteed 20ms minimum timeout and valid operation down to V_CC = 0.7V - ideal for battery-powered controllers requiring reliable brownout protection.

For engineers reviewing the MAX6804US46D2+ datasheet, MAX6804US46D2+ pinout, MAX6804US46D2+ application, or MAX6804US46D2+ equivalent, key selection criteria include its factory-trimmed 4.63V threshold, 20ms reset timeout, push/pull active-low output, ultra-low 4µA supply current, and guaranteed reset validity at V_CC ≥ 0.7V across –40°C to +125°C.

Technical Context

The MAX6804US46D2+ integrates a precision voltage comparator with factory-trimmed 4.63V reset threshold (±1.8% at +25°C, ±3% over full temperature range), debounced manual-reset input with internal 20kΩ pullup, and a fixed 20ms minimum reset timeout period. Its push/pull output drives low during reset and actively pulls high when deasserted.

It operates from 0.7V to 5.5V supply, features immunity to fast V_CC transients (e.g., ≤30µs glitch rejection at 10V/ms fall rate), and maintains valid RESET/RESET states across its full operating temperature range without external components.

Key Specifications

Pinout & Package

MAX6804US46D2+ is housed in a 4-pin SOT143 package (U4-1 outline, land pattern 90-0183), measuring 2.9mm × 1.6mm × 1.1mm, optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811TEUS46+T and TPS3808G33DBVR, the MAX6804US46D2+ uniquely delivers 4.63V precision threshold, –40°C to +125°C operation, and 4µA supply current in a pin-compatible 4-pin SOT143 - enabling direct upgrade of legacy designs without layout changes or thermal derating.

Availability

MAX6804US46D2+ is available at Aetrix Electronics and suitable for industrial controllers, battery-powered instruments, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6804US46D2+ 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, automotive, and medical applications.

The MAX6803/MAX6804/MAX6805 family delivers ultra-low-power, factory-trimmed supervisory circuits targeting space- and power-constrained µP systems requiring guaranteed reset validity down to 0.7V.

FAQ

What is the exact reset threshold voltage of MAX6804US46D2+ and how does it vary with temperature?

The MAX6804US46D2+ has a factory-trimmed nominal reset threshold of 4.63V at +25°C, with tolerance of ±1.8%. Over the full operating temperature range of –40°C to +125°C, the threshold varies within ±3% of 4.63V (i.e., 4.491V to 4.769V), as specified in Table 1 of the datasheet. This tight tolerance ensures consistent brownout detection across environmental conditions without calibration.

Does MAX6804US46D2+ require external components to function as a reset supervisor?

No, the MAX6804US46D2+ requires no external components to operate. Its internal 20kΩ MR pullup resistor enables direct switch-to-GND connection, and the factory-set 4.63V threshold and 20ms timeout eliminate the need for external resistors or capacitors. This reduces BOM count, PCB area, and design validation effort compared to adjustable supervisors.

How does the push/pull output of MAX6804US46D2+ differ from open-drain alternatives like MAX6805?

The MAX6804US46D2+ features an active-low push/pull output that actively drives both high and low states, ensuring a defined logic level at all times without external pullups. In contrast, the MAX6805 uses an open-drain output requiring an external pullup resistor and exhibiting weaker high-state drive. This makes MAX6804US46D2+ preferable in noise-sensitive or high-impedance µP reset inputs where leakage-induced indeterminate states must be avoided.

What is the minimum supply voltage at which MAX6804US46D2+ guarantees correct reset assertion?

The MAX6804US46D2+ guarantees correct reset assertion and valid output states down to V_CC = 0.7V across the full –40°C to +125°C temperature range. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where supply voltage range is specified as 0.7V to 5.5V, and RESET/RESET validity is explicitly guaranteed to 0.7V - critical for deep brownout detection in battery systems.

Is MAX6804US46D2+ pin-compatible with older Maxim reset ICs such as MAX811/MAX812?

Yes, the MAX6804US46D2+ is pin-compatible with MAX811/MAX812 and MAX6314/MAX6315 in the 4-pin SOT143 package. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = V_CC. However, users must verify matching threshold (4.63V) and timeout (20ms) requirements, as MAX811 variants may have different factory trims and temperature ratings (e.g., MAX811TEUS46+T is only rated to +85°C).