Analog Devices Inc./Maxim Integrated MAX6336US18D3

Overview

MAX6336US18D3 from Maxim Integrated is a push/pull, active-low microprocessor supervisory circuit designed for 1.8V power supply monitoring in space-constrained embedded systems. It asserts reset when VCC falls below 1.80V (±2.5% over temperature), guarantees valid RESET output down to VCC = 0.7V, features 100ms minimum reset timeout, consumes only 3.3µA at 2.5V, and operates from -40°C to +125°C in a 4-pin SOT143 package.

For engineers reviewing the MAX6336US18D3 datasheet, MAX6336US18D3 pinout, MAX6336US18D3 application, or MAX6336US18D3 equivalent, key selection criteria include guaranteed 0.7V operation, factory-trimmed 1.80V threshold with ±3% tolerance over full temperature range, 100ms reset timeout, debounced manual-reset input, and compatibility with critical low-voltage µP power monitoring in automotive and industrial controllers.

Technical Context

The MAX6336US18D3 implements a precision bandgap-based voltage comparator with factory-trimmed 1.80V reset threshold and built-in hysteresis to reject fast VCC transients up to 24µs at 10V/ms slew rate. Its push/pull output stage drives RESET low actively during fault conditions and pulls high via internal logic when deasserted.

Reset assertion is triggered by either VCC falling below 1.80V or MR pulled low; reset remains asserted for ≥100ms after VCC rises above threshold or MR is released. The device includes an internal 20kΩ pull-up on MR and requires no external components for basic operation.

Key Specifications

Pinout & Package

MAX6336US18D3 is housed in a 4-pin SOT143 surface-mount package (3.0mm × 1.6mm × 1.1mm), optimized for PCB area-constrained applications including portable equipment and automotive ECUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US18D3-T and TLV803EB18DBZR, the MAX6336US18D3 offers integrated push/pull drive, guaranteed 0.7V operation, and MR support across full automotive temperature range-making it optimal for robust, component-minimized µP supervision in harsh environments.

Availability

MAX6336US18D3 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, portable medical sensor hubs, and battery-powered smart meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6336US18D3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.

The MAX6336 series belongs to Maxim's ultra-low-voltage microprocessor supervisory product line, engineered specifically for reliable power-on reset, brownout detection, and manual reset functionality in 1.8V–3.3V embedded systems with stringent space and power constraints.

FAQ

What is the exact reset threshold voltage of the MAX6336US18D3 and how does it vary with temperature?

The MAX6336US18D3 has a factory-trimmed nominal reset threshold of 1.80V, with ±1.8% variation at +25°C and ±3% over the full -40°C to +125°C operating range. This ensures precise 1.8V rail monitoring without external calibration while maintaining reliability across automotive and industrial thermal environments. The MAX6336US18D3 datasheet specifies VTH− = 1.75V and VTH+ = 1.85V at room temperature.

Does the MAX6336US18D3 require external components to function as a standalone reset supervisor?

No, the MAX6336US18D3 requires no external components for basic operation. Its internal 20kΩ MR pull-up resistor, factory-trimmed voltage reference, and push/pull RESET output eliminate the need for external resistors, capacitors, or diodes. Only VCC, GND, RESET, and MR connections are needed-making the MAX6336US18D3 ideal for minimal-footprint designs where board space is constrained.

What is the minimum supply voltage at which the MAX6336US18D3 guarantees valid RESET output behavior?

The MAX6336US18D3 guarantees correct RESET assertion and deassertion down to VCC = 0.7V, as confirmed in its Absolute Maximum Ratings and Electrical Characteristics tables. This ultra-low operating voltage ensures deterministic reset signaling during deep brownout conditions-critical for fail-safe operation in battery-powered and automotive applications where the MAX6336US18D3 is commonly deployed.

How does the manual reset (MR) input of the MAX6336US18D3 behave, and what is its minimum pulse width requirement?

The MR input of the MAX6336US18D3 is internally pulled up to VCC with 20kΩ and accepts a logic-low signal to assert reset. It features hardware debounce and requires a minimum pulse width of 160µs at VCC = 2.6V to reliably trigger reset. Once asserted, reset remains active for ≥100ms after MR returns high-ensuring the MAX6336US18D3 provides robust field-service recovery without firmware dependency.

Is the MAX6336US18D3 pin-compatible with other Maxim reset ICs, and which ones?

Yes, the MAX6336US18D3 is pin-compatible with the MAX811/MAX812 and MAX6314/MAX6315 families in the same 4-pin SOT143 package. This allows drop-in replacement in existing layouts when upgrading to tighter threshold accuracy, lower quiescent current, or extended temperature range-provided the output type (push/pull active-low) and timing match system requirements. Always verify RESET timing and voltage levels before substituting the MAX6336US18D3.