Analog Devices Inc./Maxim Integrated MAX6336US20D3-T

Overview

The MAX6336US20D3-T from Maxim Integrated is a push/pull, active-low microprocessor supervisory circuit designed to monitor 1.8V–3.3V power supplies and assert reset during brownout, power-up, or manual initiation. It features a factory-trimmed 2.00V reset threshold, 100ms minimum reset timeout, ultra-low 0.7V operating supply voltage, and operates across –40°C to +125°C for automotive and industrial embedded systems.

For engineers reviewing the MAX6336US20D3-T datasheet, MAX6336US20D3-T pinout, MAX6336US20D3-T application, or MAX6336US20D3-T equivalent, key selection criteria include guaranteed RESET validity down to VCC = 0.7V, debounced manual-reset input with internal 20kΩ pull-up, low 3.3µA supply current at 1.8V, and SOT143 package compatibility with MAX811/MAX812 and MAX6314/MAX6315.

Technical Context

This device implements a precision voltage comparator with hysteresis and a fixed-delay timer to generate a clean, glitch-immune reset pulse. The reset comparator ignores fast transients on VCC (e.g., ≤24µs at 10mV overdrive), and its threshold is factory-trimmed to ±1.8% at +25°C and ±3% over full temperature range.

The MAX6336US20D3-T uses a push/pull output stage capable of sourcing ≥200µA at VCC ≥1.8V (VOH ≥0.8VCC) and sinking ≥50µA at VCC ≥1.0V (VOL ≤0.4V), ensuring robust drive into CMOS inputs without external pull-ups. Its MR input includes internal debouncing and 160µs minimum pulse width requirement.

Key Specifications

Pinout & Package

MAX6336US20D3-T is housed in a 4-pin SOT143 package (JEDEC TO-236AB), measuring 2.9mm × 1.3mm × 1.0mm, with gull-wing leads and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811SUR23D3-T and MAX6314US20D3-T, the MAX6336US20D3-T uniquely combines 2.00V precision threshold, push/pull drive, and guaranteed 0.7V operation-making it optimal for next-generation low-voltage embedded systems where reset integrity at ultra-low VCC is critical.

Availability

MAX6336US20D3-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and battery-powered medical sensors requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6336US20D3-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 industrial, automotive, communications, and computing applications, with emphasis on reliability and integration.

The MAX633x family delivers ultra-low-voltage, low-power microprocessor supervisory circuits targeting space-constrained, high-reliability embedded systems where brownout resilience and manual reset functionality are essential.

FAQ

What is the exact reset threshold voltage of the MAX6336US20D3-T?

The MAX6336US20D3-T has a factory-trimmed nominal reset threshold of 2.00V, with a tolerance of ±1.8% at +25°C and ±3% over the full –40°C to +125°C operating range. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "US20" suffix variant. The MAX6336US20D3-T is optimized for monitoring 1.8V supply rails while maintaining margin against noise-induced false triggering.

Does the MAX6336US20D3-T support operation below 1.0V supply voltage?

Yes, the MAX6336US20D3-T is fully specified to operate down to 0.7V VCC and guarantees valid RESET output state (low during assertion) at that level. This capability is explicitly documented in the General Description and Electrical Characteristics sections, distinguishing it from alternatives like the MAX811 which require ≥1.0V. The MAX6336US20D3-T's push/pull output maintains defined VOL and VOH performance even at 0.7V, enabling robust reset signaling during deep brownout.

What is the function of the MR pin on the MAX6336US20D3-T?

The MR (Manual Reset) pin on the MAX6336US20D3-T is a debounced, active-low input that asserts RESET when pulled to ≤0.5V. It features an internal 20kΩ pull-up resistor, allowing it to be left unconnected if unused. A normally open momentary switch between MR and GND provides hardware-initiated reset without external components. The MAX6336US20D3-T requires a minimum MR pulse width of 160µs to ensure reliable detection, and reset remains asserted for the full 100ms timeout after MR returns high.

How does the MAX6336US20D3-T handle power supply transients?

The MAX6336US20D3-T incorporates a transient-immune reset comparator that rejects negative-going VCC glitches up to 24µs in duration when overdriven by 10mV-per the Maximum Transient Duration vs. Reset Comparator Overdrive graph in the datasheet. This design prevents false resets caused by switching noise, load dumps, or coupling spikes. Unlike basic reset ICs, the MAX6336US20D3-T's comparator includes built-in hysteresis and propagation delay filtering, making it suitable for electrically noisy automotive and industrial environments.

Is the MAX6336US20D3-T pin-compatible with other Maxim reset ICs?

Yes, the MAX6336US20D3-T is pin-compatible with the MAX811/MAX812 and MAX6314/MAX6315 families in the 4-pin SOT143 package. Pin 1 (GND), Pin 2 (RESET), Pin 3 (MR), and Pin 4 (VCC) maintain identical assignments and electrical behavior for push/pull variants. However, note that MAX6314 is open-drain and MAX811 has different threshold options-so while PCB layout can be reused, functional validation of timing, threshold, and output drive is required before drop-in substitution. The MAX6336US20D3-T retains full pinout equivalence for direct replacement within its own family.