Analog Devices Inc./Maxim Integrated MAX6801UR44D3/V+T

Overview

MAX6801UR44D3/V+T from Maxim Integrated is a precision 4.38V active-low microprocessor supervisory circuit in a 3-pin SOT23 package, featuring push/pull RESET output, 100ms minimum reset timeout, ultra-low 4µA supply current, and guaranteed operation down to VCC = 0.7V. It monitors 2.85V–5.0V power supplies in embedded controllers and portable equipment to ensure reliable power-on reset and brownout protection.

For engineers reviewing the MAX6801UR44D3/V+T datasheet, MAX6801UR44D3/V+T pinout, MAX6801UR44D3/V+T application, or MAX6801UR44D3/V+T equivalent, key selection criteria include factory-trimmed 4.38V threshold accuracy (±1.8% at +25°C), push/pull drive capability (VOH ≥ 0.8×VCC, VOL ≤ 0.4V @ ISINK = 50µA), and industrial temperature range support (−40°C to +125°C).

Technical Context

The MAX6801UR44D3/V+T implements a dedicated voltage-monitoring comparator with factory-trimmed 4.38V reset threshold and hysteresis optimized for immunity to fast VCC transients (e.g., <30µs glitches at 100mV overdrive). Its internal reset timer guarantees ≥100ms assertion after VCC rises above threshold, with propagation delay <30µs during VCC fall.

This device operates as a standalone reset generator with no external components required. Its push/pull output drives CMOS inputs directly without pull-up resistors, and its 0.7V minimum operating voltage ensures valid RESET state during deep brownout conditions before system shutdown.

Key Specifications

Pinout & Package

MAX6801UR44D3/V+T is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - ideal for space-constrained PCB layouts in handheld and sensor modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6801UR44D3/V+T, MAX6327LT29D3+T offers lower threshold for 3.3V systems but fails to detect 5V rail collapse; MAX6802UR44D3/V+T provides identical threshold but requires pull-up and lacks drive strength for noise-sensitive applications - making MAX6801UR44D3/V+T optimal for robust 5V µP reset in new designs.

Availability

MAX6801UR44D3/V+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX6801UR44D3/V+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 communications markets.

The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, precision voltage supervision for microprocessor-based systems - designed specifically to replace discrete reset circuits with single-chip solutions that guarantee reliability across extreme temperatures and supply transients.

FAQ

What is the exact reset threshold voltage of MAX6801UR44D3/V+T and how tightly is it specified?

The MAX6801UR44D3/V+T has a factory-trimmed nominal reset threshold of 4.38V, with ±1.8% tolerance at +25°C and ±3% over the full −40°C to +125°C operating range. This specification is guaranteed by design and production-tested per Maxim's datasheet Table 1, ensuring consistent detection of 5V supply droop across all units and environmental conditions. The MAX6801UR44D3/V+T uses laser trimming for precision without external components.

Does MAX6801UR44D3/V+T require an external pull-up resistor on the RESET pin?

No, MAX6801UR44D3/V+T does not require an external pull-up resistor because it features a push/pull output stage. Its active-low RESET pin actively drives low during reset assertion and actively drives high (to ≥0.8×VCC) when deasserted, enabling direct connection to standard microcontroller RESET inputs without additional passive components. This distinguishes MAX6801UR44D3/V+T from open-drain alternatives like MAX6802UR44D3/V+T.

What is the minimum supply voltage at which MAX6801UR44D3/V+T guarantees valid RESET output?

MAX6801UR44D3/V+T guarantees valid RESET output down to VCC = 0.7V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. At this voltage, the internal comparator remains functional and the push/pull output maintains defined logic states - critical for detecting deep brownout conditions before system collapse. This specification applies across the full −40°C to +125°C temperature range.

How does MAX6801UR44D3/V+T handle fast power-supply transients?

MAX6801UR44D3/V+T incorporates a transient-immune reset comparator that rejects negative-going VCC glitches shorter than 30µs at 100mV overdrive, as shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Comparator Overdrive." This design prevents false resets caused by switching noise, ESD coupling, or relay bounce - a key differentiator from basic voltage detectors lacking glitch filtering.

Is MAX6801UR44D3/V+T pin-compatible with other Maxim reset supervisors?

Yes, MAX6801UR44D3/V+T is pin-compatible with MAX809/MAX810, MAX6326/MAX6327/MAX6328, and MAX6346/MAX6347/MAX6348 per the datasheet Applications Information section. All share the same 3-pin SOT23 footprint and pinout (GND, RESET, VCC), enabling drop-in replacement in existing designs - provided the reset threshold (4.38V) and timeout (100ms) match system requirements.