Analog Devices Inc./Maxim Integrated MAX6801UR29D2+T

Overview

MAX6801UR29D2+T from Maxim Integrated is a precision 2.93V active-low microprocessor supervisory circuit in SOT23-3 package, featuring push/pull RESET output, 20ms 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 and holding it for ≥20ms after VCC recovery.

For engineers reviewing the MAX6801UR29D2+T datasheet, MAX6801UR29D2+T pinout, MAX6801UR29D2+T application, or MAX6801UR29D2+T equivalent, key selection factors include factory-trimmed 2.93V threshold accuracy (±1.8% at +25°C), ultra-low 4µA supply current, transient-immune reset comparator, and compatibility with bidirectional µP reset pins when used with external pullup.

Technical Context

The MAX6801UR29D2+T implements a precision bandgap-based voltage comparator with factory-trimmed 2.93V reset threshold and hysteresis optimized for brownout detection. Its internal timing circuit generates a fixed 20ms minimum reset pulse width after VCC rises above threshold, independent of supply ramp rate.

It uses BiCMOS process technology to achieve 0.7V minimum operating voltage while maintaining push/pull output drive capability: VOL ≤ 0.4V at ISINK = 50µA and VCC ≥ 1.0V, VOH ≥ 0.8×VCC at ISOURCE = 500µA and VCC ≥ 3.0V - enabling direct interface with CMOS logic without external components.

Key Specifications

Pinout & Package

MAX6801UR29D2+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051) with 0.95mm pitch, compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G33DBVR, the MAX6801UR29D2+T uniquely combines 2.93V precision, 20ms fixed timeout, 0.7V operation, and 4µA ICC in a drop-in SOT23-3 footprint - making it optimal for space-constrained, battery-powered, and industrial-grade reset supervision.

Availability

MAX6801UR29D2+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical infusion pumps, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6801UR29D2+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6800/MAX6801/MAX6802 family delivers precision, low-power microprocessor supervisory circuits targeting space-constrained and battery-operated systems requiring guaranteed reset behavior across extreme temperatures and brownout conditions.

FAQ

What is the exact reset threshold voltage of MAX6801UR29D2+T and how tightly is it specified?

The MAX6801UR29D2+T has a factory-trimmed nominal reset threshold of 2.93V, with tolerance of ±1.8% at +25°C and ±3% over the full -40°C to +125°C temperature range. This precision enables accurate brownout detection in 3.0V and 3.3V systems without external calibration, and the value is laser-trimmed during wafer sort per Table 1 of the datasheet.

Does MAX6801UR29D2+T support operation at VCC below 1.0V, and what is its behavior at low supply?

Yes, MAX6801UR29D2+T is guaranteed to maintain correct reset state down to VCC = 0.7V, with RESET remaining asserted until VCC rises above 2.93V and then held for ≥20ms. At VCC < 1.0V, VOL remains ≤0.4V (ISINK = 50µA), ensuring valid logic-low output even during deep brownout - critical for fail-safe µP reset in battery-depleted conditions.

What is the reset timeout duration of MAX6801UR29D2+T and is it temperature-stable?

The MAX6801UR29D2+T provides a minimum reset timeout of 20ms after VCC rises above the 2.93V threshold. The timeout is internally generated and fully specified over -40°C to +125°C, with typical variation <±15% across temperature - confirmed by the "Normalized Reset Timeout Period vs. Temperature" graph (toc02) showing stable performance across the full range.

How does the push/pull output of MAX6801UR29D2+T differ from open-drain alternatives like MAX6802?

The MAX6801UR29D2+T features an active-low push/pull RESET output that actively drives both high and low states, eliminating the need for an external pullup resistor. In contrast, MAX6802 uses open-drain output requiring external pullup. This makes MAX6801UR29D2+T ideal for noise-sensitive systems where pullup resistors could introduce leakage or slow edges, and simplifies BOM by removing one passive component.

Is MAX6801UR29D2+T pin-compatible with legacy supervisors such as MAX809 or MAX6326?

Yes, MAX6801UR29D2+T is explicitly pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 families in the 3-pin SOT23 package. Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC - identical pinout and footprint (outline 21-0051). This allows direct replacement in existing designs without PCB modification, provided the 2.93V threshold and 20ms timeout meet system requirements.