Analog Devices Inc./Maxim Integrated MAX6454UT29S

Overview

MAX6454UT29S from Maxim Integrated is a low-power, dual-output µP supervisor IC with separate active-low open-drain VCC reset and manual reset outputs, factory-set 2.925V VCC reset threshold (±1.5% over temperature), 140ms min reset timeout, and adjustable RSTIN input supporting down to 0.63V monitoring - used for reliable power-on reset and pushbutton-initiated system recovery in consumer electronics and industrial embedded systems.

For engineers reviewing the MAX6454UT29S datasheet, MAX6454UT29S pinout, MAX6454UT29S application, or MAX6454UT29S equivalent, this page delivers verified circuit role, exact reset thresholds, manual reset timing behavior, SOT23-6 package constraints, and real-world soft/hard reset implementation guidance - all confirmed from Maxim's official Rev 4 datasheet (19-2637).

Technical Context

The MAX6454UT29S implements independent reset logic paths: VCC reset asserts when VCC falls below 2.925V (±1.5%) or RSTIN drops below 0.63V, with guaranteed valid reset assertion down to VCC = 1.0V; manual reset output (MROUT) responds immediately to MR low and remains asserted for ≥140ms after MR deasserts, without affecting the VCC reset output.

Its open-drain RESET and MROUT outputs require external pullups and support level-shifting across 0–6V logic domains; the internal 50kΩ MR pullup enables direct pushbutton interfacing, while RSTIN's high-impedance input (±25nA leakage) allows ultra-low-power external resistor-divider configuration for secondary voltage monitoring.

Key Specifications

Pinout & Package

MAX6454UT29S is housed in a 6-pin SOT23-6 package (package code U6-1), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant, with exposed pad option not supported. Pin 1 is RESET, Pin 2 is GND, Pin 3 is MROUT, Pin 4 is VCC, Pin 5 is RSTIN, Pin 6 is MR - confirmed from Maxim's official pin diagram (Rev 4, p.5).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6454UT29D and TPS3808G33DBVR, the MAX6454UT29S uniquely delivers both factory-trimmed 2.925V supervision and dedicated open-drain MROUT - enabling hardware-level soft/hard reset differentiation without additional logic or firmware polling.

Availability

MAX6454UT29S is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6454UT29S 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, with emphasis on reliability and integration for embedded systems.

The MAX6453–MAX6456 family was engineered specifically for dual-role microprocessor supervision - delivering independent VCC and manual reset signaling in ultra-small SOT23-6 packages for space-constrained consumer and industrial electronics.

FAQ

What is the exact VCC reset threshold voltage for MAX6454UT29S?

The MAX6454UT29S has a factory-trimmed VCC reset threshold of 2.925V, with ±1.5% tolerance over the full -40°C to +85°C operating range. This value is confirmed in Table 1 of the Maxim datasheet (Rev 4), where suffix "29" corresponds to 2.925V nominal. The MAX6454UT29S does not support user adjustment of this threshold - it is laser-trimmed during production.

Does MAX6454UT29S assert both RESET and MROUT when the manual reset button is pressed?

No - the MAX6454UT29S asserts only MROUT when MR is pulled low; the RESET output remains unaffected by MR activity. This behavior is defined in the General Description and Pin Description sections of the datasheet and distinguishes MAX6454UT29S from MAX6455/MAX6456 variants, which tie MR to both outputs. For MAX6454UT29S, RESET asserts solely on VCC or RSTIN undervoltage events.

What is the minimum VCC voltage at which MAX6454UT29S guarantees valid RESET output operation?

The MAX6454UT29S guarantees valid RESET output logic state down to VCC = 1.0V, as stated in the Electrical Characteristics table under "Guaranteed Valid Reset Down to VCC = 1.0V". Below 1.0V, RESET current-sinking capability degrades, and external pulldown resistors are ineffective due to the open-drain architecture - so 1.0V is the functional lower limit for reliable reset assertion.

Can MAX6454UT29S monitor a 1.8V supply using the RSTIN pin?

Yes - the MAX6454UT29S RSTIN pin has a fixed 0.63V threshold, so a 1.8V supply can be monitored by connecting it to RSTIN through an external resistor divider. Using the formula VMON_TH = 0.63 × (R1 + R2)/R2, selecting R2 = 250kΩ yields R1 ≈ 458kΩ for 1.8V detection. The RSTIN input draws only ±25nA, making high-value resistors practical without significant error.

Is MAX6454UT29S pin-compatible with other devices in the MAX6453–MAX6456 family?

Yes - all MAX6453–MAX6456 devices share identical SOT23-6 pinouts and footprint (U6-1), including MAX6454UT29S. Pin 1 is RESET, Pin 2 is GND, Pin 3 is MROUT, Pin 4 is VCC, Pin 5 is RSTIN, and Pin 6 is MR. However, functional compatibility depends on variant: MAX6454UT29S (open-drain, MR controls MROUT only) is not functionally interchangeable with MAX6455UT29S (MR controls both outputs) without circuit review.