Analog Devices Inc./Maxim Integrated MAX6383XR46D3+

Overview

The MAX6383XR46D3+ from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit in a 3-pin SC70 package, featuring a factory-set reset threshold of +4.63V (±2.5% over -40°C to +125°C) and a 140ms minimum reset timeout period. It monitors VCC supply voltage down to +1.0V, consumes only 3µA at +1.8V, and guarantees valid reset output state down to VCC = 1V - ideal for battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6383XR46D3+ datasheet, MAX6383XR46D3+ pinout, MAX6383XR46D3+ application, or MAX6383XR46D3+ equivalent, this device delivers precise voltage monitoring with transient immunity, ultra-low quiescent current, and guaranteed logic-level validity across its full operating range - critical for portable instrumentation, industrial controllers, and low-voltage µP systems where supply stability and reset integrity are non-negotiable.

Technical Context

The MAX6383XR46D3+ implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over temperature (-40°C to +125°C) and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset assertion window after VCC recovers above the 4.63V threshold.

As an open-drain active-low reset device, it requires an external pull-up resistor on the RESET pin and supports interfacing with mixed-voltage logic domains. It lacks manual reset (MR) or auxiliary RESET IN inputs - distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389 variants.

Key Specifications

Pinout & Package

Package: 3-pin SC70 (X3-2), 1.25mm × 0.85mm × 0.6mm, RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326TASD3+, the MAX6383XR46D3+ trades off external component count for flexible voltage-domain interfacing; compared with TLV803EB46DBZR, it delivers 3× lower quiescent current and proven transient immunity - making it optimal for long-life, noise-sensitive, or multi-rail designs.

Availability

MAX6383XR46D3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6383XR46D3+ 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 communications applications.

The MAX638x family was engineered specifically for ultra-low-power, high-accuracy µP reset supervision in space-constrained and battery-sensitive systems - emphasizing threshold stability, minimal current draw, and robust transient rejection.

FAQ

What is the exact reset threshold voltage of the MAX6383XR46D3+ and how stable is it over temperature?

The MAX6383XR46D3+ has a factory-set nominal reset threshold of +4.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning the threshold drifts less than ±0.3% across the entire range - ensuring consistent brownout detection in automotive and industrial environments where ambient temperature varies widely. This specification is verified per the MAX6381–MAX6390 datasheet Electrical Characteristics table.

Does the MAX6383XR46D3+ include a manual reset input (MR) or auxiliary voltage monitor (RESET IN)?

No, the MAX6383XR46D3+ does not include a manual reset input (MR) or auxiliary RESET IN pin. It is a single-supply, fixed-threshold supervisory circuit monitoring only VCC. MR is present on MAX6384/MAX6385/MAX6386/MAX6390, and RESET IN is available on MAX6387/MAX6388/MAX6389 - but these features are excluded from the MAX6383XR46D3+ to minimize size, cost, and quiescent current. Its pinout is strictly VCC, RESET, and GND.

What is the minimum supply voltage at which the MAX6383XR46D3+ guarantees correct reset output logic state?

The MAX6383XR46D3+ guarantees that its open-drain RESET output remains in a valid logic state (high-impedance when deasserted, low when asserted) down to VCC = +1.0V. This is explicitly specified in the Electrical Characteristics table under "Reset Output State Guaranteed Valid Down to VCC = 1V". Below 1.0V, the internal circuitry may not operate reliably, so system design must ensure reset is asserted before VCC falls below this limit.

Can the MAX6383XR46D3+ be used with a 3.3V microcontroller I/O rail despite its 4.63V reset threshold?

Yes, the MAX6383XR46D3+ can interface with a 3.3V µP I/O rail because its RESET pin is open-drain. An external pull-up resistor to the 3.3V rail ensures the RESET signal swings between 0V (asserted) and 3.3V (deasserted), fully compatible with 3.3V logic thresholds. The 4.63V threshold applies only to the monitored VCC supply (which must be ≥4.5V to ensure proper operation), not to the reset output voltage domain.

What is the maximum sink current capability of the MAX6383XR46D3+ RESET output, and what pull-up value is recommended?

The MAX6383XR46D3+ RESET output can sink up to 3.2mA at VCC ≥ 4.5V while maintaining VOL ≤ 0.4V (per datasheet). For typical use with a 3.3V or 5V pull-up, a 10kΩ resistor limits sink current to ~0.33mA or ~0.5mA respectively - well within spec and minimizing power loss. Larger values (e.g., 100kΩ) are acceptable for ultra-low-power applications where rise time is not critical, as leakage is <1.0µA when deasserted.