Analog Devices Inc./Maxim Integrated MAX6802UR46D3/V+T

Overview

MAX6802UR46D3/V+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in a 3-pin SOT23 package, designed to monitor 4.63V power supplies with ±3% threshold accuracy over -40°C to +125°C and assert reset for ≥100ms after VCC rises above threshold. It operates down to 1.0V supply voltage, draws only 5µA at 5V, and provides transient-immune brownout detection for embedded controllers and battery-powered systems.

For engineers reviewing the MAX6802UR46D3/V+T datasheet, MAX6802UR46D3/V+T pinout, MAX6802UR46D3/V+T application, or MAX6802UR46D3/V+T equivalent, key selection criteria include its factory-trimmed 4.63V reset threshold, guaranteed 100ms minimum timeout, open-drain output compatibility with bidirectional μP reset pins, and operation down to 1.0V VCC - critical for low-voltage portable and automotive subsystems.

Technical Context

The MAX6802UR46D3/V+T implements a precision bandgap-based reset comparator with factory-trimmed 4.63V threshold (±1.8% at +25°C, ±3% over full temperature range) and internal timing capacitor for fixed 100ms reset pulse width. Its open-drain RESET output requires an external pullup resistor and supports wired-OR configurations with microcontrollers like the Motorola 68HC11.

It features immunity to fast VCC transients (e.g., ≤30µs glitches at 100mV overdrive), guaranteed valid reset assertion down to VCC = 1.0V, and operates across -40°C to +125°C without external components. The BiCMOS process ensures low 5µA supply current at 5V and stable performance under varying load and temperature conditions.

Key Specifications

Pinout & Package

MAX6802UR46D3/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 gull-wing leads suitable for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6802UR46D3/V+T, MAX6327UT46D3+T offers simpler drive but sacrifices open-drain interoperability, while TPS3808G33DBVR trades factory precision for configurability - making MAX6802UR46D3/V+T optimal for space-constrained, high-reliability 5V systems requiring guaranteed 4.63V trip and bidirectional reset support.

Availability

MAX6802UR46D3/V+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical monitors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX6802UR46D3/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 demanding industrial, automotive, and computing applications, emphasizing reliability, low power, and integration.

The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, pin-compatible supervisory circuits for microprocessor reset generation - engineered specifically for space-constrained, high-temperature, and battery-sensitive systems where external components must be eliminated.

FAQ

What is the exact reset threshold voltage of MAX6802UR46D3/V+T, and how does it vary with temperature?

The MAX6802UR46D3/V+T has a factory-trimmed nominal reset threshold of 4.63V. At +25°C, this is guaranteed within ±1.8% (4.547V to 4.713V); over the full -40°C to +125°C operating range, the tolerance widens to ±3% (4.491V to 4.769V), as specified in Table 1 of the datasheet. This precision eliminates need for external calibration while maintaining robustness across environmental extremes.

Does MAX6802UR46D3/V+T require an external pullup resistor on the RESET pin?

Yes, MAX6802UR46D3/V+T requires an external pullup resistor on the RESET pin because it features an open-drain output. A typical value is 10kΩ to 100kΩ connected between RESET and the monitored VCC rail or another logic-compatible supply. This configuration enables wired-OR functionality and compatibility with bidirectional microcontroller reset pins, as confirmed in the Applications Information section.

What is the minimum supply voltage at which MAX6802UR46D3/V+T guarantees correct reset behavior?

MAX6802UR46D3/V+T guarantees correct reset assertion and output state down to VCC = 1.0V, unlike the MAX6800/MAX6801 variants which guarantee operation to 0.7V. This 1.0V minimum ensures reliable brownout detection during severe supply sags in battery-powered or automotive applications, as explicitly stated in the General Description and Electrical Characteristics sections.

Can MAX6802UR46D3/V+T be used in automotive applications, and what temperature range does it support?

Yes, MAX6802UR46D3/V+T is rated for -40°C to +125°C operation and is documented in Maxim's Ordering Information as suitable for automotive-qualified use. Its guaranteed performance across this extended temperature range, combined with transient immunity and 1.0V operation, makes it appropriate for body control modules, infotainment power domains, and other under-hood or cabin-located subsystems requiring high-reliability reset supervision.

How does the 100ms reset timeout of MAX6802UR46D3/V+T compare to other versions in the MAX6802 family?

The "D3" suffix in MAX6802UR46D3/V+T denotes a factory-programmed 100ms minimum reset timeout period. Other variants include D1 (1ms min) and D2 (20ms min). All share identical threshold, package, and electrical specs - only the timeout differs. The 100ms version ensures sufficient hold time for complex μPs and peripherals to stabilize, especially in systems with slow power-rail ramp rates or external memory initialization sequences.