Analog Devices Inc./Maxim Integrated MAX6383XR29D1+

Overview

MAX6383XR29D1+ from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.93V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 3μA supply current at +1.8V. It monitors single VCC supply in battery-powered systems and ensures reliable μP reset during brownout or power-up.

For engineers reviewing the MAX6383XR29D1+ datasheet, MAX6383XR29D1+ pinout, MAX6383XR29D1+ application, or MAX6383XR29D1+ equivalent, key selection criteria include open-drain output compatibility with shared reset buses, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy across automotive temperature range, and SC70-3 package footprint constraints.

Technical Context

The MAX6383XR29D1+ implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.93V threshold, with internal timer enforcing 140ms minimum reset assertion after VCC recovery. Its open-drain RESET output requires an external pullup and remains valid down to VCC = 1V, enabling robust reset signaling in deep brownout conditions.

No manual reset (MR) input or auxiliary RESET IN comparator is integrated-this variant is optimized for simple single-supply monitoring without user-initiated or dual-voltage supervision functions, distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389 family members.

Key Specifications

Pinout & Package

MAX6383XR29D1+ is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with pins arranged in standard top-view configuration: Pin 1 = RESET (open-drain active-low), Pin 2 = VCC, Pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1+T, MAX6383XR29D1+ offers open-drain output for bus sharing but requires external pullup; compared with TPS3808G125DBVR, it delivers lower supply current at sub-2V operation and tighter timeout specification, making it preferable for ultra-low-power battery systems.

Availability

MAX6383XR29D1+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, automotive body control modules, and industrial handheld scanners requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6383XR29D1+ 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 power, sensing, and connectivity in demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP reset supervision for space- and energy-constrained systems where reliable power-up sequencing and brownout protection are critical.

FAQ

What is the exact reset threshold voltage of MAX6383XR29D1+ and how tightly is it specified?

The MAX6383XR29D1+ has a factory-set nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. This means the actual threshold falls between 2.85V and 3.00V at any temperature within that range, ensuring consistent brownout detection without external calibration. The MAX6383XR29D1+ achieves this via laser-trimmed on-chip resistors and precision bandgap references.

Does MAX6383XR29D1+ include a manual reset input (MR) pin?

No, MAX6383XR29D1+ does not include a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality. Only MAX6384–MAX6386 and MAX6390 variants integrate an MR pin with internal pullup. For designs requiring operator-initiated reset, consider MAX6384XR29D1+ instead - the MAX6383XR29D1+ is strictly a VCC-only supervisory device.

What package type and dimensions does MAX6383XR29D1+ use?

MAX6383XR29D1+ is supplied in a 3-pin SC70 package (outline number 21-0075, land pattern 90-0208), measuring 1.25mm × 0.85mm with 0.65mm pin pitch. This RoHS-compliant, lead-free package features gull-wing leads and is optimized for reflow soldering on fine-pitch PCBs. It is distinct from the 4-pin SC70 and 6-pin μDFN variants used by other members of the MAX6381–MAX6390 family.

Can MAX6383XR29D1+ operate reliably when VCC drops below 1.8V?

Yes, MAX6383XR29D1+ guarantees correct reset output behavior down to VCC = 1.0V. Its internal circuitry remains functional and the open-drain RESET pin maintains valid logic states (high-impedance when deasserted, low when asserted) throughout this range. At VCC = 1.0V, supply current drops to ~1.5μA, and reset threshold accuracy degrades slightly but remains within specification limits - a key advantage for ultra-low-voltage battery backup scenarios.

Is MAX6383XR29D1+ pin-compatible with legacy Maxim reset ICs like MAX809?

MAX6383XR29D1+ is not pin-compatible with MAX809 due to differing package types: MAX6383XR29D1+ uses 3-pin SC70, while MAX809 uses 3-pin SOT23. Although both have identical pin 1 (RESET), pin 2 (VCC), and pin 3 (GND) assignments, their footprints, thermal characteristics, and solder reflow profiles differ. Direct replacement requires PCB layout revision. However, MAX6383XR29D1+ is functionally compatible and listed as a pin-compatible alternative in Maxim's documentation for design upgrades targeting smaller size and lower current.