Analog Devices Inc./Maxim Integrated MAX16033PLB31+T

Overview

MAX16033PLB31+T from Maxim Integrated is a low-power, 10-pin μDFN supervisory circuit providing microprocessor reset, battery switchover, power-fail warning, and chip-enable gating. It features a factory-set 3.08V reset threshold, active-low open-drain RESET/PFO outputs, and operates from 1.2V to 5.5V supply with 13µA quiescent current. It is used in portable POS terminals and critical μP systems requiring reliable brownout protection and SRAM backup.

For engineers reviewing the MAX16033PLB31+T datasheet, MAX16033PLB31+T pinout, MAX16033PLB31+T application, or MAX16033PLB31+T equivalent, key selection criteria include its 3.08V reset threshold accuracy, 140ms minimum reset timeout, battery switchover hysteresis (40mV), open-drain output configuration, and -40°C to +85°C industrial temperature range.

Technical Context

The MAX16033PLB31+T integrates a precision reset generator with a 3.08V ±70mV threshold, independent power-fail comparator (1.235V ±50mV), debounced manual-reset input, and chip-enable transmission gate. Its internal MOSFET enables seamless VCC-to-BATT switchover when VCC falls below both VTH and VBATT, with 40mV hysteresis to prevent oscillation during slow voltage decay.

It supports system-level reliability via active-low open-drain RESET and PFO outputs, 1.2V minimum operating voltage, and 13µA supply current at 2.8V. The CEIN-to-CEOUT path provides <7ns propagation delay (50Ω/50pF) and <100Ω on-resistance, enabling safe CMOS RAM write blocking during brownout events.

Key Specifications

Pinout & Package

MAX16033PLB31+T is housed in a 2mm × 2mm, 10-pin µDFN package with exposed pad (pin 10 = GND EP). The package supports reflow soldering and delivers low thermal resistance for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16033LLB31+T, the MAX16033PLB31+T offers open-drain flexibility for shared interrupt lines but requires external pull-ups; compared with TPS3808G33DBVR, it adds full battery switchover, CE gating, and dual-output fault signaling-critical for SRAM-retention systems.

Availability

MAX16033PLB31+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial controllers, set-top boxes, and medical instruments requiring stable component supply across extended product lifecycles.

Supply support for MAX16033PLB31+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 industrial, computing, and communications markets.

The MAX16033–MAX16040 family targets compact, battery-backed μP systems requiring integrated reset, power-fail warning, and memory protection-optimized for space-constrained portable and industrial equipment.

FAQ

What is the exact reset threshold voltage of the MAX16033PLB31+T?

The MAX16033PLB31+T has a factory-set reset threshold of 3.00V (min), 3.08V (typ), and 3.15V (max) over the full -40°C to +85°C temperature range. This 3.08V nominal value is laser-trimmed during production and applies specifically to the "31" suffix variant, ensuring precise brownout detection for 3.3V systems without external components.

Does the MAX16033PLB31+T support battery switchover, and what is its hysteresis?

Yes, the MAX16033PLB31+T supports automatic battery switchover from VCC to BATT when VCC falls below both the reset threshold and VBATT. It implements a fixed 40mV hysteresis between VCC and VBATT to prevent oscillatory switching during slow voltage decay-verified in the BATT-to-OUT On-Resistance vs. Temperature graphs in the datasheet.

What output type does the MAX16033PLB31+T use for RESET and PFO?

The MAX16033PLB31+T uses active-low open-drain outputs for both RESET and PFO. This configuration requires external pull-up resistors but enables wired-OR connection of multiple interrupt sources and flexible voltage-level translation-distinct from the push-pull variant MAX16033LLB31+T.

How does the chip-enable gating function work in the MAX16033PLB31+T?

The MAX16033PLB31+T gates CEIN to CEOUT only when RESET is deasserted. During reset, CEOUT is held high to freeze memory access. Propagation delay is 1.5–7ns (50Ω source, 50pF load), and on-resistance is <100Ω. This prevents data corruption in SRAM during brownout-confirmed in Figure 1 and CEIN-to-CEOUT On-Resistance vs. Temperature plots.

What is the minimum operating voltage for the MAX16033PLB31+T?

The MAX16033PLB31+T operates down to 1.2V on VCC, with RESET remaining valid and functional even at this level. This enables compatibility with ultra-low-voltage microcontrollers and ensures deterministic reset behavior during deep brownout conditions where other supervisors may fail.