Analog Devices Inc./Maxim Integrated MAX6800UR46D3/V+T

Overview

MAX6800UR46D3/V+T from Maxim Integrated is a push/pull active-high microprocessor supervisory circuit in SOT23-3 package, monitoring 4.63V supply threshold with 100ms minimum reset timeout, ultra-low 4µA supply current, and guaranteed operation down to 0.7V VCC for reliable power-on/brownout reset in space-constrained embedded systems.

For engineers reviewing the MAX6800UR46D3/V+T datasheet, MAX6800UR46D3/V+T pinout, MAX6800UR46D3/V+T application, or MAX6800UR46D3/V+T equivalent, key selection criteria include reset polarity (active-high), factory-trimmed 4.63V threshold tolerance (±1.8% at +25°C), 100ms timeout stability over -40°C to +125°C, and compatibility with 2.85–5.0V digital systems requiring low-quiescent-current supervision.

Technical Context

The MAX6800UR46D3/V+T implements a precision bandgap-based reset comparator with factory-trimmed 4.63V threshold and hysteresis optimized to reject fast VCC transients up to 30µs at 100mV overdrive. Its push/pull output drives high during reset assertion without external pull-up, enabling direct interface to µP reset inputs requiring active-high logic.

Designed for fail-safe operation across full industrial temperature range (-40°C to +125°C), it guarantees valid RESET output down to VCC = 0.7V and maintains ±3% threshold accuracy over temperature, with propagation delay under 30µs during VCC fall at 10V/ms.

Key Specifications

Pinout & Package

MAX6800UR46D3/V+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051) with 0.95mm pitch, footprint-compatible with industry-standard 3-pin supervisory ICs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TLV809K33DBZR, the MAX6800UR46D3/V+T uniquely delivers factory-trimmed 4.63V active-high reset in a no-component-required SOT23-3 solution, making it optimal for 4.8V rail supervision where polarity and precision are non-negotiable.

Availability

MAX6800UR46D3/V+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical portable diagnostic devices requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6800UR46D3/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, designs precision analog and mixed-signal ICs for industrial, automotive, and computing applications, emphasizing reliability, low power, and integration.

The MAX6800 family targets cost-sensitive, space-constrained microprocessor supervision tasks-delivering factory-trimmed thresholds, ultra-low current, and guaranteed operation down to 0.7V VCC without external components.

FAQ

What is the exact reset threshold voltage for MAX6800UR46D3/V+T and how tightly is it specified?

The MAX6800UR46D3/V+T has a factory-trimmed reset threshold of 4.63V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating range. This precision eliminates manual calibration and ensures consistent brownout response across production units and temperature extremes. The MAX6800UR46D3/V+T is specifically selected for 4.8V nominal supply supervision where tight threshold control is critical.

Does MAX6800UR46D3/V+T require an external pull-up resistor on its RESET pin?

No, the MAX6800UR46D3/V+T features a push/pull active-high output that actively drives high during reset assertion and sinks current when deasserted-no external pull-up resistor is needed. This simplifies layout, reduces BOM count, and avoids potential leakage issues in low-power systems. The MAX6800UR46D3/V+T's integrated driver ensures clean, rail-to-rail RESET transitions without external components.

What is the minimum supply voltage at which MAX6800UR46D3/V+T guarantees valid RESET output?

The MAX6800UR46D3/V+T guarantees valid RESET output down to VCC = 0.7V, meaning it correctly asserts active-high RESET even during severe brownout conditions where the supply drops below 1V. This capability is confirmed across the full -40°C to +125°C temperature range and is essential for fail-safe operation in battery-powered or automotive applications. The MAX6800UR46D3/V+T maintains this specification without requiring external biasing networks.

How does MAX6800UR46D3/V+T handle fast transients on the VCC supply line?

The MAX6800UR46D3/V+T incorporates transient immunity circuitry that rejects negative-going VCC glitches up to 30µs in duration when the overdrive is 100mV, as shown in the Maximum Transient Duration vs. Reset Comparator Overdrive graph. This prevents false resets caused by switching noise or load transients, ensuring robust operation in electrically noisy environments like motor drives or automotive power systems. The MAX6800UR46D3/V+T achieves this without sacrificing response speed during actual brownout events.

Is MAX6800UR46D3/V+T pin-compatible with other supervisory ICs in SOT23-3 package?

Yes, the MAX6800UR46D3/V+T uses the standard SOT23-3 pinout (GND, RESET, VCC) and is explicitly stated as pin-compatible with MAX809/MAX810, MAX6326/MAX6327/MAX6328, and MAX6346/MAX6347/MAX6348 families. This allows direct replacement in existing layouts where active-high reset and 4.63V threshold are acceptable, though output polarity and timing must be verified against the original design requirements. The MAX6800UR46D3/V+T retains identical mechanical and electrical interface compatibility.