Analog Devices Inc./Maxim Integrated MAX6804US46D2

Overview

MAX6804US46D2 from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit designed for power supply monitoring in 2.85V–5.0V digital systems. It asserts reset when VCC falls below 4.63V (factory-trimmed threshold), provides 20ms minimum reset timeout, operates down to 0.7V supply, draws only 5µA typical supply current, and features a debounced manual reset input-ideal for automotive and portable equipment power sequencing.

For engineers reviewing the MAX6804US46D2 datasheet, MAX6804US46D2 pinout, MAX6804US46D2 application, or MAX6804US46D2 equivalent, key selection criteria include its guaranteed RESET validity to VCC = 0.7V, factory-set 4.63V threshold with ±3% tolerance over –40°C to +125°C, SOT143-4 package compatibility, and push/pull output drive capability without external pullup.

Technical Context

The MAX6804US46D2 integrates a precision voltage comparator with hysteresis and a temperature-stable reset timeout timer. Its reset assertion logic responds to VCC falling below 4.63V (±3% over full temperature range) or MR low assertion, holding RESET active for ≥20ms after recovery-ensuring reliable µP initialization during brownout and power-up events.

It uses internal 20kΩ MR pullup and exhibits immunity to fast VCC transients (e.g., ≤30µs at 100mV overdrive), while maintaining valid push/pull RESET output down to VCC = 0.7V-critical for fail-safe operation in automotive and industrial embedded controllers.

Key Specifications

Pinout & Package

MAX6804US46D2 is housed in a 4-pin SOT143 package (3.0mm × 1.5mm × 1.0mm body, 0.95mm pitch), optimized for space-constrained PCB layouts in automotive and portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX812REUS+T and TLV803EB29DBZR, the MAX6804US46D2 uniquely combines 4.63V precision threshold, 20ms timeout, push/pull output, and full –40°C to +125°C qualification in SOT143-making it optimal for automotive and industrial applications requiring robust, drop-in supervision without layout revision.

Availability

MAX6804US46D2 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

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 and mixed-signal ICs for industrial, automotive, communications, and computing markets.

The MAX6803/MAX6804/MAX6805 family delivers ultra-low-power, high-accuracy µP supervisory circuits targeting space- and reliability-critical applications in harsh environments.

FAQ

What is the factory-trimmed reset threshold voltage for MAX6804US46D2?

The MAX6804US46D2 has a factory-trimmed reset threshold of 4.63V, with ±3% tolerance over the full operating temperature range of –40°C to +125°C. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "46" suffix. The threshold is set at wafer level and requires no external adjustment, ensuring consistent performance across production lots without calibration.

Does MAX6804US46D2 support operation below 1.0V VCC?

Yes, MAX6804US46D2 is guaranteed to assert and maintain a valid RESET signal down to VCC = 0.7V - a key differentiator from alternatives like MAX6805 (1.0V min). This capability ensures fail-safe supervision during deep brownout conditions in automotive and industrial systems, where supply collapse may extend below 1V before recovery.

What is the meaning of the "D2" suffix in MAX6804US46D2?

The "D2" suffix in MAX6804US46D2 indicates a factory-programmed minimum reset timeout period of 20ms. This value is fixed at manufacture and cannot be adjusted externally. The timeout begins when VCC rises above the 4.63V threshold or when the MR input is deasserted, and ensures sufficient hold time for microprocessor core and peripheral initialization before release.

Is MAX6804US46D2 pin-compatible with other members of the MAX680x family?

Yes, MAX6804US46D2 shares identical pinout and SOT143-4 package with all MAX6803/MAX6804/MAX6805 variants, including MAX6804US26D2 and MAX6804US44D2. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC - enabling direct substitution within the same output type (push/pull) and package, provided threshold and timeout requirements align.

What is the maximum sink current capability of the RESET output on MAX6804US46D2?

The RESET output of MAX6804US46D2 can sink up to 3.2mA while maintaining VOL ≤ 0.4V, specified at VCC ≥ 4.25V. This push/pull drive strength eliminates the need for external pullup resistors and ensures robust interfacing with standard CMOS microcontroller reset inputs, even under worst-case voltage and temperature conditions.