Analog Devices Inc./Maxim Integrated MAX6335US16D3+T

Overview

The MAX6335US16D3+T from Maxim Integrated is an ultra-low-voltage, push/pull active-high microprocessor supervisory circuit in a 4-pin SOT143 package. It monitors 1.8V–3.3V power supplies, asserts reset when VCC falls below 1.60V (±3% over temperature), provides 100ms minimum reset timeout, draws only 3.0–6.0µA at 1.8V, and operates down to 0.7V supply-enabling reliable brownout detection in portable and automotive systems.

For engineers reviewing the MAX6335US16D3+T datasheet, MAX6335US16D3+T pinout, MAX6335US16D3+T application, or MAX6335US16D3+T equivalent, key selection criteria include its factory-trimmed 1.60V reset threshold, guaranteed RESET validity to VCC = 0.7V, debounced manual-reset input with internal 20kΩ pull-up, and compatibility with space-constrained embedded designs requiring deterministic power-on reset behavior.

Technical Context

This device implements a precision bandgap-based reset comparator with ±1.8% room-temperature accuracy and ±3% over –40°C to +125°C, immune to fast VCC transients (e.g., ≤24µs at 10mV overdrive). Its reset assertion logic combines voltage monitoring and manual-reset debouncing without external components.

The MAX6335US16D3+T uses a push/pull output stage delivering VOH ≥0.8VCC (ISOURCE = 1µA, VCC ≥1.0V) and VOL ≤0.3V (ISINK = 500µA, VCC ≥1.8V), ensuring robust interface with high-impedance µP reset inputs-even during low-VCC brownout recovery down to 0.7V.

Key Specifications

Pinout & Package

Package: 4-pin SOT143 (1.3mm × 1.3mm × 0.9mm), surface-mount, lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6336US16D3+T and MAX6315US16D3+T, the MAX6335US16D3+T uniquely delivers active-high push/pull reset with guaranteed functionality down to 0.7V-making it the sole choice for µPs requiring active-high assertion and deep brownout coverage without external components.

Availability

MAX6335US16D3+T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, automotive body control modules, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6335US16D3+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 demanding industrial, automotive, and computing applications.

The MAX6335 series belongs to Maxim's ultra-low-voltage µP supervisory product line, engineered specifically for reliable power-monitoring in space-constrained, low-power systems where brownout detection below 1.0V is critical.

FAQ

What is the factory-trimmed reset threshold voltage for MAX6335US16D3+T?

The MAX6335US16D3+T has a factory-trimmed reset threshold of 1.60V, with ±1.8% accuracy at +25°C and ±3% over the full –40°C to +125°C operating temperature range. This value is laser-trimmed during production and specified in Table 1 of the datasheet; it enables precise brownout detection for 1.8V logic domains without external adjustment. The MAX6335US16D3+T maintains this threshold stability across voltage and temperature variations inherent in portable and automotive power rails.

Does MAX6335US16D3+T require external components for basic reset functionality?

No, the MAX6335US16D3+T requires no external components for core operation: its MR input includes a 20kΩ internal pull-up resistor, and its active-high push/pull RESET output drives directly into a µP reset pin without needing a pull-up or pull-down. This eliminates at least three passives (resistor, capacitor, diode) typically used in discrete reset circuits. The MAX6335US16D3+T achieves full supervision-voltage monitoring, manual reset, and timed assertion-with only VCC, GND, MR, and RESET connections.

What is the minimum supply voltage at which MAX6335US16D3+T guarantees valid RESET output?

The MAX6335US16D3+T guarantees valid RESET output down to VCC = 0.7V, meaning VOH ≥0.8VCC and VOL ≤0.3V remain within specification across the entire operating range. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where "MAX6335/MAX6336" are jointly specified for 0.7V minimum VCC. Below 0.7V, the device may cease functioning-but at 0.7V, the MAX6335US16D3+T ensures deterministic reset assertion and release, critical for battery-depleted systems.

How does the manual-reset input (MR) of MAX6335US16D3+T behave during operation?

The MR input of MAX6335US16D3+T is internally debounced and features a 20kΩ pull-up resistor to VCC, allowing it to be left unconnected if unused. A logic-low pulse ≥160µs on MR asserts RESET high for the full 100ms timeout period-even if MR returns high earlier. This eliminates need for external RC debounce networks. During normal operation, MR can be driven by a momentary switch to GND or controlled by FPGA/ASIC logic, and the MAX6335US16D3+T ensures glitch-free reset initiation regardless of noise on the MR line.

Is MAX6335US16D3+T pin-compatible with other Maxim supervisory ICs?

Yes, the MAX6335US16D3+T is pin-compatible with the MAX811/MAX812 and MAX6314/MAX6315 families in the 4-pin SOT143 package, sharing identical pinout (GND, RESET, MR, VCC). However, output polarity and structure differ: MAX6335US16D3+T provides active-high push/pull, while MAX811 is active-low push/pull and MAX6315 is active-low open-drain. Direct substitution requires verifying µP reset input polarity and drive requirements; the MAX6335US16D3+T is not a drop-in replacement without schematic review.