Analog Devices Inc./Maxim Integrated MAX16125WTDP29+T

Overview

The MAX16125WTDP29+T from Maxim Integrated is a dual pushbutton controller IC with single-supply voltage monitoring, featuring one manual reset input (MR), one active-low open-drain RESET output, and one soft-reset output (SRESET) mirroring MR. It operates from 1.6V to 5.5V, consumes only 5µA quiescent current at 3V, and provides factory-trimmed 2.93V VCC reset threshold with ±2.5% accuracy over -40°C to +125°C - used in portable medical devices and battery-powered handhelds for reliable power-on reset and user-initiated hard reset.

For engineers reviewing the MAX16125WTDP29+T datasheet, MAX16125WTDP29+T pinout, MAX16125WTDP29+T application, or MAX16125WTDP29+T equivalent, key selection criteria include its 2.93V factory-set reset threshold, resistor-adjustable 13-second manual reset setup delay (via SEL pin), guaranteed RESET validity down to VCC = 0.95V, and 0.86mm × 1.25mm 6-bump WLP package for ultra-compact space-constrained designs.

Technical Context

This device integrates a precision voltage comparator with 30ppm/°C tempco for stable 2.93V undervoltage detection, a deglitch block adding 20ms fixed debounce on MR input, and independent timing circuits for reset timeout (7.2ms minimum) and manual reset setup delay (13s). Its open-drain RESET output requires an external pullup, while SRESET provides a debounced, glitch-free replica of MR state.

The SEL pin supports resistor-adjustable setup delay (tSU = R_SEL/20, where R_SEL in kΩ yields tSU in seconds), and internal 50kΩ MR pullup eliminates external biasing. The circuit ensures immunity to short VCC transients (<10µs at 0.2V overdrive) and guarantees functional operation across automotive temperature range (-40°C to +125°C).

Key Specifications

Pinout & Package

MAX16125WTDP29+T uses a 0.86mm × 1.25mm, 6-bump wafer-level package (WLP) with bottom-side solder bumps. Pin mapping is defined by bump position (A1–C2) and function per MAX16124/MAX16125 configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16125WTDP29+T, the MAX16125WTDB29+T offers identical electrical behavior but removes resistor adjustability - simplifying layout at the cost of timing flexibility - while the TPS3808G33DBVR omits manual reset entirely, limiting it to passive supply monitoring rather than interactive system recovery.

Availability

MAX16125WTDP29+T is available at Aetrix Electronics and suitable for glucose monitors, smartphones, portable ECG devices, and industrial handheld scanners requiring stable component supply across automotive-grade temperature ranges and long-term production continuity.

Supply support for MAX16125WTDP29+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 power, sensing, and interface applications in demanding environments.

The MAX16122–MAX16125 family targets space-constrained, battery-operated portable electronics requiring robust, low-power reset supervision with user-interactive pushbutton control - optimized for medical, consumer, and industrial handhelds.

FAQ

What is the exact reset threshold voltage of the MAX16125WTDP29+T?

The MAX16125WTDP29+T features a factory-trimmed VCC reset threshold of 2.93V (typical), with ±2.5% tolerance over temperature and supply variations. This value is laser-trimmed during production and corresponds to the "29" suffix in the part number per Table 3 of the datasheet. It is designed specifically to monitor 3.3V supplies with adequate headroom for ripple and droop.

How is the 13-second manual reset setup delay implemented in the MAX16125WTDP29+T?

The MAX16125WTDP29+T achieves its 13-second setup delay via the "P" suffix, which configures the SEL pin for resistor-adjustable timing. A 260kΩ resistor from SEL to GND sets t_SU = R_SEL/20 = 13s, per the formula in the datasheet. This replaces fixed-delay configurations and allows precise tuning without changing the IC footprint or layout.

Does the MAX16125WTDP29+T support both push-pull and open-drain RESET outputs?

No - the MAX16125WTDP29+T has an open-drain RESET output, as confirmed by the Selector Guide and pin description. It requires an external pullup resistor. The "D" in the suffix denotes open-drain, whereas "B" would indicate push-pull. SRESET is also open-drain and mirrors MR with 200ns propagation delay.

Can the MAX16125WTDP29+T operate reliably below 1.6V supply voltage?

The MAX16125WTDP29+T guarantees functional operation down to VCC = 0.95V for RESET output validity, but its specified operating range starts at 1.6V. Below 1.6V, internal circuitry (e.g., comparator, oscillator) may not behave predictably - the 0.95V guarantee applies only to maintaining correct logic state on RESET, not full functionality.

What is the purpose of the SRESET output in the MAX16125WTDP29+T?

The SRESET output in the MAX16125WTDP29+T is a debounced, glitch-filtered replica of the MR input signal, with 200ns propagation delay and 20ms deglitching. It provides a clean, software-accessible interrupt signal to the host µP while RESET handles hard system reset - enabling dual-path reset handling (e.g., soft reboot vs. full power cycle) from a single pushbutton.