Analog Devices Inc./Maxim Integrated MAX6804US29D1+T

Overview

MAX6804US29D1+T from Maxim Integrated is a 4-pin SOT143 push/pull active-low microprocessor supervisory circuit with 2.93V factory-trimmed reset threshold, 1ms minimum reset timeout, and guaranteed operation down to VCC = 0.7V. It monitors 2.85V–5.0V power supplies in embedded controllers and portable equipment, asserting RESET during brownout or manual reset events.

For engineers reviewing the MAX6804US29D1+T datasheet, MAX6804US29D1+T pinout, MAX6804US29D1+T application, or MAX6804US29D1+T equivalent, key selection criteria include its ultra-low 4µA supply current, ±3% reset threshold accuracy over –40°C to +125°C, debounced MR input, and compatibility with space-constrained designs requiring reliable power-on reset signaling.

Technical Context

The MAX6804US29D1+T implements a precision bandgap-based reset comparator with factory-trimmed 2.93V threshold (±1.8% at +25°C, ±3% over full temperature range) and immunity to VCC transients ≤30µs at 10V/ms slew rate. Its internal 20kΩ MR pullup eliminates external components for manual reset functionality.

It features a push/pull RESET output capable of sourcing ≥0.8×VCC at 500µA and sinking ≤0.4V at 3.2mA (VCC ≥4.25V), ensuring robust drive into CMOS inputs. The 1ms minimum timeout is factory-programmed and stable across temperature (±15% variation from –40°C to +125°C).

Key Specifications

Pinout & Package

MAX6804US29D1+T is housed in a 4-pin SOT143 package (U4-1 outline, 21-0052 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1+T and TPS3808G12QDBVRQ1, the MAX6804US29D1+T uniquely combines ultra-low ICC (4µA), integrated MR debounce, and 1ms timeout in a pin-compatible SOT143 footprint-enabling compact, low-power, and firmware-simple reset architecture.

Availability

MAX6804US29D1+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for MAX6804US29D1+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 industrial, automotive, and computing applications.

The MAX6804US29D1+T belongs to the MAX680x family of ultra-low-power µP supervisors-engineered specifically for space- and energy-constrained embedded systems needing deterministic reset behavior across wide temperature and supply-voltage ranges.

FAQ

What is the factory-trimmed reset threshold voltage of the MAX6804US29D1+T?

The MAX6804US29D1+T has a factory-trimmed reset threshold of 2.93V, specified with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C operating range. This precise threshold ensures accurate brownout detection for 3.0V and 3.3V microprocessor rails without external calibration. The value is laser-trimmed during production and documented in Table 1 of the MAX6803/MAX6804/MAX6805 datasheet.

Does the MAX6804US29D1+T require external components for manual reset functionality?

No, the MAX6804US29D1+T does not require external components for manual reset. It integrates a 20kΩ internal pullup resistor on the MR pin, allowing direct connection of a normally open momentary switch between MR and GND. The device also provides hardware debounce, eliminating the need for RC filters or firmware debouncing routines-reducing BOM count and PCB area.

What is the minimum supply voltage at which the MAX6804US29D1+T guarantees valid RESET output?

The MAX6804US29D1+T guarantees valid RESET output down to VCC = 0.7V across the full –40°C to +125°C temperature range. This ensures deterministic reset assertion during deep brownout conditions, critical for protecting nonvolatile memory writes and preventing undefined MCU states. Below 0.7V, the device ceases operation, but RESET remains asserted until VCC falls below functional threshold.

How does the 1ms reset timeout of the MAX6804US29D1+T compare to other members of the MAX680x family?

The MAX6804US29D1+T uses the "D1" suffix to denote a 1ms minimum reset timeout period-distinct from D2 (20ms min) and D3 (100ms min) variants. This shortest timeout meets timing requirements of modern low-latency microcontrollers such as ARM Cortex-M0+/M4, enabling rapid system initialization without unnecessary delay. All timeouts are factory-programmed and exhibit ±15% stability over temperature.

Is the MAX6804US29D1+T pin-compatible with older Maxim reset supervisors like the MAX811?

Yes, the MAX6804US29D1+T is pin-compatible with the MAX811/MAX812 series in the 4-pin SOT143 package, sharing identical pinout (VCC, RESET, MR, GND) and footprint. However, it improves upon them with lower supply current (4µA vs. 20µA), tighter threshold accuracy (±1.8% vs. ±2.5%), and guaranteed operation down to 0.7V (vs. 1.0V for MAX811). No PCB changes are required for drop-in replacement in most designs.