Analog Devices Inc./Maxim Integrated MAX6326XR29-T

Overview

MAX6326XR29-T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.93V power supplies and assert a reset signal during brownout, power-up, or power-down events. It guarantees correct reset state down to VCC = 1.2V, delivers ≥100ms reset timeout after VCC recovery, consumes ≤1µA supply current at 3V, and operates over –40°C to +85°C in SC70-3 package - used in portable battery-powered µP systems requiring reliable, low-quiescent-power supply monitoring.

For engineers reviewing the MAX6326XR29-T datasheet, MAX6326XR29-T pinout, MAX6326XR29-T application, or MAX6326XR29-T equivalent, this page provides verified technical context, exact reset threshold behavior (2.93V ±2.5%), SC70-3 terminal mapping, real-world timing constraints (100–280ms timeout), and validated alternatives for 2.9V–3.0V supply monitoring designs.

Technical Context

The MAX6326XR29-T implements a precision bandgap-based reset comparator with factory-trimmed 2.93V threshold (±1.5% at +25°C, ±2.5% over full temperature range) and 40ppm/°C tempco. Its internal reset timer ensures minimum 100ms assertion after VCC rises above threshold, with timeout varying from 100ms to 280ms across temperature.

It features push-pull active-low RESET output capable of sourcing 500µA at 0.8·VCC (VCC ≥ 2.1V) and sinking 1.6mA at ≤0.3V, with immunity to fast VCC transients up to 100V/µs slew rate and no external components required.

Key Specifications

Pinout & Package

MAX6326XR29-T is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), with 0.65mm pitch, 0.9mm height, and RoHS-compliant lead-free construction (marked "ACP" on top).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD29+T and TPS3808G33DBVR, the MAX6326XR29-T delivers superior combination of guaranteed minimum reset timeout, lowest quiescent current, and smallest footprint - making it optimal for space- and power-constrained µP supervision where deterministic reset timing is critical.

Availability

MAX6326XR29-T is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial PLC I/O modules, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6326XR29-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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6326 family was engineered specifically for ultra-low-power microprocessor reset supervision in battery-operated and energy-sensitive systems, emphasizing precision threshold accuracy, minimal ICC, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of MAX6326XR29-T and how does it vary with temperature?

The MAX6326XR29-T has a factory-trimmed nominal reset threshold of 2.93V at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% over the full –40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning threshold drift is bounded and predictable across temperature - critical for maintaining reliable reset behavior in unregulated 3.0V supply environments. This specification is confirmed in the Electrical Characteristics table of the official MAX6326 datasheet.

Does MAX6326XR29-T require any external components to function?

No, the MAX6326XR29-T requires zero external components. Its precision reset threshold, internal timing capacitor, and push-pull output driver are fully integrated. Unlike open-drain supervisors, it needs no external pull-up resistor. The device operates with only VCC, GND, and RESET connections - simplifying design, reducing BOM count, and improving reliability in compact portable electronics where board space is constrained.

What is the minimum VCC voltage at which MAX6326XR29-T guarantees correct reset state?

The MAX6326XR29-T guarantees correct reset assertion and deassertion behavior down to VCC = 1.2V over the full –40°C to +85°C temperature range. This allows the device to maintain supervision capability during deep brownout conditions where other supervisors may fail or behave unpredictably - a key requirement for fail-safe operation in battery-powered systems approaching end-of-life voltage.

How does the reset timeout of MAX6326XR29-T behave across temperature and supply voltage?

The MAX6326XR29-T guarantees a minimum reset timeout of 100ms after VCC rises above the 2.93V threshold, with typical values ranging from 100ms to 280ms depending on temperature and process variation. The datasheet specifies 100ms (min), 185ms (typ), and 280ms (max) - ensuring µP initialization completes reliably even under worst-case silicon and thermal conditions. This is distinct from parts with only typical timeout specs.

Is MAX6326XR29-T pin-compatible with other members of the MAX6326 family or legacy Maxim supervisors?

Yes, the MAX6326XR29-T shares identical SC70-3 pinout (GND, RESET, VCC) with all MAX6326/MAX6327/MAX6328 variants in SC70-3 package, and is pin-compatible with MAX803/MAX809/MAX810 in same-outline packages. However, output polarity differs across families: MAX6326XR29-T is active-low push-pull, while MAX6327 variants are active-high - direct substitution requires verification of µP reset input polarity and timing requirements.