Analog Devices Inc./Maxim Integrated MAX16125WTDB29+T

Overview

MAX16125WTDB29+T from Maxim Integrated is a dual pushbutton controller IC with single-supply 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 typical supply current at 3V, and provides factory-trimmed 2.93V VCC reset threshold with ±2.5% accuracy over -40°C to +125°C. It is used in portable medical devices like glucose monitors to implement reliable, low-power hard-reset functionality via existing front-panel buttons.

For engineers reviewing the MAX16125WTDB29+T datasheet, MAX16125WTDB29+T pinout, MAX16125WTDB29+T application, or MAX16125WTDB29+T equivalent, key selection considerations include its 2.93V factory-set reset threshold, 7.2ms minimum reset timeout (suffix 'B'), resistor- or pin-selectable 13s/15s/17s setup delay (suffix 'D'), open-drain RESET output, and 0.86mm × 1.25mm 6-bump WLP package for space-constrained battery-powered designs.

Technical Context

The MAX16125WTDB29+T implements a precision voltage monitor with internal comparator and 2.93V factory-trimmed threshold (±2.5%), hysteresis of 2%, and 30ppm/°C tempco. Its manual reset path includes a deglitch block with fixed 20ms debounce period and configurable setup delay (13/15/17s per Table 1a) selected by SEL pin connection (GND/VCC/unconnected).

It features two independent reset outputs: open-drain active-low RESET (guaranteed valid down to VCC = 0.95V) and SRESET - a debounced, logic-mirrored version of MR. The device uses BiCMOS process, supports VCC transient immunity up to 14µs at 0.25V overdrive, and guarantees RESET assertion during brownout, power-up, and power-down sequences.

Key Specifications

Pinout & Package

MAX16125WTDB29+T is housed in a 0.86mm × 1.25mm, 6-bump wafer-level package (WLP) with bottom-side solder bumps. The package is lead(Pb)-free and RoHS-compliant (+T suffix), optimized for automated placement and reflow in high-volume portable electronics manufacturing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16125WTDB29+T, MAX16124WTDB29+T offers identical timing and threshold but simplifies BOM with push-pull RESET, whereas TPS3808G33DBVR lacks manual reset capability entirely-making it unsuitable as a functional replacement despite similar voltage monitoring specs.

Availability

MAX16125WTDB29+T is available at Aetrix Electronics and suitable for glucose monitors, smartphones, and portable instrumentation requiring stable component supply across automotive-grade temperature ranges and long-lifecycle production programs.

Supply support for MAX16125WTDB29+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 was developed specifically for space-constrained, battery-powered consumer and medical devices needing integrated pushbutton supervision with ultra-low quiescent current and factory-trimmed voltage thresholds.

FAQ

What is the exact reset threshold voltage of MAX16125WTDB29+T and how is it trimmed?

The MAX16125WTDB29+T has a factory-trimmed nominal VCC reset threshold of 2.93V, with ±2.5% tolerance over temperature and process variation. This value is laser-trimmed during final test and permanently stored in the die; no external components or configuration registers are required to achieve this accuracy. The '29' suffix in MAX16125WTDB29+T explicitly denotes the 2.93V threshold option per Table 3 of the datasheet.

Does MAX16125WTDB29+T support both push-pull and open-drain RESET outputs?

No - MAX16125WTDB29+T features an open-drain RESET output only, as confirmed by the Selector Guide (page 14) and Electrical Characteristics table. The '5' in the part number identifies the MAX16125 variant, which pairs open-drain RESET with SRESET output. Push-pull RESET is available only on MAX16124WTDB29+T (variant '4'), not on MAX16125WTDB29+T.

What is the function of the SEL pin on MAX16125WTDB29+T and how is it configured for 13s setup delay?

On MAX16125WTDB29+T, the SEL pin selects the manual reset setup delay (tSU) between 13s, 15s, and 17s. To configure 13s, SEL must be connected to GND per Table 1a. The 'D' suffix in MAX16125WTDB29+T indicates the D-group delay options (13/15/17s), and GND connection selects the first value in that group. Leaving SEL unconnected or tying to VCC yields 15s or 17s respectively.

Can MAX16125WTDB29+T operate reliably below 1.6V supply voltage?

MAX16125WTDB29+T is specified for operation from 1.6V to 5.5V, and its RESET output is guaranteed valid only down to VCC = 0.95V - not full functionality. Below 1.6V, internal circuitry (including voltage monitor and timer) may cease operation, though RESET remains asserted if already active. The device does not function correctly at, e.g., 1.2V; operation outside 1.6V–5.5V violates Absolute Maximum Ratings and is unsupported.

How does the SRESET output behave relative to the MR input on MAX16125WTDB29+T?

On MAX16125WTDB29+T, SRESET is a debounced, logic-mirrored copy of the MR input: when MR is pulled low, SRESET goes low after 200ns (tMRD); when MR returns high, SRESET follows after the same delay. Unlike RESET, SRESET does not depend on timeout periods or voltage monitoring - it simply provides a clean, glitch-free replica of MR for use in non-critical subsystem reset paths.