Analog Devices Inc./Maxim Integrated MAX6383XR28D2+T

Overview

MAX6383XR28D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.80V reset threshold (±2.5% over –40°C to +125°C), and 20ms minimum reset timeout period. It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V and guarantees valid reset state down to VCC = 1V - used in portable battery-powered equipment for reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6383XR28D2+T datasheet, MAX6383XR28D2+T pinout, MAX6383XR28D2+T application, or MAX6383XR28D2+T equivalent, key selection criteria include its 3-pin SC70 package, open-drain output requiring external pullup, ±2.5% threshold accuracy across automotive temperature range, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.

Technical Context

The MAX6383XR28D2+T implements a precision voltage comparator with internal 2.80V reference and an on-chip timer that asserts reset for ≥20ms after VCC rises above threshold. Its open-drain RESET output requires an external pullup resistor and remains valid down to VCC = 1V, enabling robust reset signaling even during deep brownout conditions.

No manual reset (MR) input or auxiliary RESET IN is included - this variant is optimized for single-supply monitoring only. It belongs to the MAX6381–MAX6390 family sharing BiCMOS process, AEC-Q100-qualified variants, and pin-compatible footprint with legacy MAX809/MAX810 series.

Key Specifications

Pinout & Package

MAX6383XR28D2+T is housed in a RoHS-compliant 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with 0.65mm pitch and thermal resistance θ_JA = 340.4°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G28DBVR, the MAX6383XR28D2+T uniquely combines true open-drain output, 3μA ultra-low current, and identical 3-pin SC70 pinout with legacy Maxim supervisors - enabling drop-in replacement where wired-OR reset buses or multi-voltage domain interfacing is required.

Availability

MAX6383XR28D2+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial control panels, automotive body electronics, and critical μP power monitoring requiring stable component supply and long-term lifecycle support.

Supply support for MAX6383XR28D2+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, communications, and consumer applications.

The MAX6381–MAX6390 product line delivers low-power, high-accuracy μP supervisory circuits optimized for space- and energy-constrained systems requiring guaranteed reset behavior across extreme temperatures.

FAQ

What is the exact reset threshold voltage of MAX6383XR28D2+T and how stable is it over temperature?

The MAX6383XR28D2+T has a factory-set nominal reset threshold of 2.80V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This stability is achieved via laser-trimmed on-chip references and BiCMOS process design, eliminating drift-related failures in automotive and industrial deployments. The MAX6383XR28D2+T maintains this tolerance without external calibration.

Does MAX6383XR28D2+T include a manual reset (MR) input or auxiliary voltage monitor?

No, the MAX6383XR28D2+T does not include a manual reset (MR) input or auxiliary RESET IN pin. It is a single-supply, open-drain reset supervisor only - matching the functional scope of MAX6381/MAX6382/MAX6383 variants. For MR capability, consider MAX6384XR28D2+T; for dual-voltage monitoring, select MAX6387XR28D2+T. The MAX6383XR28D2+T simplifies design by omitting unused features.

What package type and footprint does MAX6383XR28D2+T use, and is it compatible with standard reflow processes?

The MAX6383XR28D2+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with 0.65mm pitch and RoHS-compliant lead-free finish. It is qualified for standard Pb-free reflow per JEDEC J-STD-020, with peak soldering temperature up to +260°C. The small 1.25mm × 0.85mm footprint supports high-density layouts while maintaining thermal performance (θ_JA = 340.4°C/W).

Can MAX6383XR28D2+T drive a reset line directly, or does it require external components?

The MAX6383XR28D2+T features an open-drain active-low RESET output and requires an external pullup resistor to the target logic voltage (e.g., 1.8V, 3.3V, or 5V). Without this pullup, the output cannot assert a valid high state. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. The MAX6383XR28D2+T itself does not integrate pullup circuitry.

How does the 20ms reset timeout of MAX6383XR28D2+T compare to other timing options in the MAX6381–MAX6390 family?

The MAX6383XR28D2+T uses the D2 suffix, specifying a 20ms minimum reset timeout - one of seven discrete delays available (1ms, 20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms). This value balances fast recovery with sufficient margin for slow-ramping supplies and MCU internal clock stabilization. Other variants like MAX6383XR28D3+T offer 140ms for more conservative systems, while D1 (1ms) suits high-speed digital logic.