Analog Devices Inc./Maxim Integrated MAX6456UT29L+

Overview

MAX6456UT29L+ from Maxim Integrated is a dual-output, low-power µP supervisor IC with separate VCC reset and manual reset outputs, factory-set 2.925V VCC reset threshold, 6.72s extended MR setup period, and open-drain active-low RESET/MROUT outputs. It supports soft-system interrupt (MROUT) and hard-system reboot (RESET) in SOT23-6 packaging for embedded power monitoring in industrial and consumer systems.

For engineers reviewing the MAX6456UT29L+ datasheet, MAX6456UT29L+ pinout, MAX6456UT29L+ application, or MAX6456UT29L+ equivalent, this page delivers verified specifications, functional timing behavior, real-world use cases, and validated alternative options - all grounded in Maxim's official documentation and electrical characterization data.

Technical Context

The MAX6456UT29L+ implements a dual-comparator architecture: one precision bandgap-based comparator monitors VCC against a fixed 2.925V threshold, while a second high-impedance comparator monitors RSTIN against a 0.63V reference to support adjustable secondary voltage supervision down to 0.63V. Both comparators feed into independent timeout latches with guaranteed 140ms minimum assertion periods.

Its MR input controls both outputs: a short MR pulse (<6.72s) asserts only MROUT for nonmaskable interrupt signaling; holding MR low ≥6.72s asserts both MROUT and RESET, enabling coordinated soft/hard reset sequences. The open-drain outputs require external pullups and are specified to sink 3.2mA at VCC ≥4.25V with VOL ≤0.4V.

Key Specifications

Pinout & Package

Package: SOT23-6, surface-mount, RoHS-compliant (indicated by '+' suffix), footprint per Maxim land pattern 90-0175.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6456UT29L+, MAX6455UT29L+ offers identical timing and thresholds but simplifies layout with push-pull outputs, while TPS3808G33DBVR reduces cost and current draw at the expense of dual-output flexibility and adjustable supervision - making MAX6456UT29L+ optimal for systems requiring coordinated interrupt-and-reboot control.

Availability

MAX6456UT29L+ is available at Aetrix Electronics and suitable for industrial PLC controllers, consumer set-top boxes, medical patient monitors, and automotive infotainment systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MAX6456UT29L+ 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 management, sensing, and interface applications, with emphasis on high-reliability industrial and automotive markets.

The MAX6453–MAX6456 family was engineered specifically for dual-rail microprocessor supervision with integrated soft/hard reset differentiation, targeting space-constrained embedded systems needing deterministic power-up, brownout, and user-initiated recovery behavior.

FAQ

What is the exact VCC reset threshold voltage for MAX6456UT29L+?

The MAX6456UT29L+ has a factory-trimmed VCC reset threshold of 2.925V, with ±1.5% tolerance over -40°C to +85°C. This value is confirmed in Table 1 of the datasheet and corresponds to the "29" suffix in the part number. The threshold is laser-trimmed during production and does not require external calibration.

How does the MR input behave on MAX6456UT29L+ compared to MAX6454UT29L+?

On MAX6456UT29L+, the MR input controls both MROUT and RESET outputs: a short MR pulse asserts only MROUT, while holding MR low ≥6.72s asserts both outputs. In contrast, MAX6454UT29L+ uses MR exclusively for MROUT and leaves RESET unaffected - making MAX6456UT29L+ uniquely capable of unified soft/hard reset sequencing.

Can MAX6456UT29L+ monitor a 1.2V supply using the RSTIN pin?

Yes. Using the 0.63V internal RSTIN reference, a resistor divider (e.g., R1 = 220kΩ, R2 = 250kΩ) sets VMON_TH = 0.63V × (220k + 250k)/250k ≈ 1.2V. The MAX6456UT29L+ RSTIN input draws only ±25nA, enabling high-impedance dividers that minimize standby current - ideal for battery-powered systems.

What is the minimum VCC voltage at which MAX6456UT29L+ guarantees valid RESET output logic?

The MAX6456UT29L+ guarantees correct RESET output logic (low when asserted, high-impedance when deasserted) down to VCC = 1.0V. Below 1.0V, current-sinking capability degrades; however, most microprocessors cease operation above 1.0V, so this specification ensures functional reset coverage across the entire operational range of typical 3.3V and 2.5V systems.

Is MAX6456UT29L+ pin-compatible with other members of the MAX6453–MAX6456 family?

Yes - all MAX6453–MAX6456 variants share identical SOT23-6 pinout and footprint (land pattern 90-0175). However, output type differs: MAX6456UT29L+ uses open-drain outputs, while MAX6455UT29L+ uses push-pull. Swapping requires verifying pullup requirements and logic compatibility, but PCB layout remains unchanged.