Analog Devices Inc./Maxim Integrated MAX6454UT29S+

Overview

MAX6454UT29S+ from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with separate active-low open-drain VCC reset and manual reset outputs. It monitors VCC (2.925V factory-set threshold) and an adjustable secondary voltage down to 0.63V via RSTIN, asserts reset on undervoltage with 140ms minimum timeout, and supports soft-system interrupt (MROUT) and hard-system reboot (RESET) functions in consumer electronics power management.

For engineers reviewing the MAX6454UT29S+ datasheet, MAX6454UT29S+ pinout, MAX6454UT29S+ application, or MAX6454UT29S+ equivalent, this device delivers precise dual-threshold supervision, 6µA supply current, guaranteed reset validity down to VCC = 1.0V, and SOT23-6 packaging for space-constrained embedded systems requiring reliable power-on reset and pushbutton-initiated recovery.

Technical Context

The MAX6454UT29S+ implements two independent reset comparators: one for VCC (factory-trimmed to 2.925V ±1.5%) and one for RSTIN (0.630V ±15mV), each with 2.5mV hysteresis. Its MR input controls only MROUT - not RESET - enabling dedicated nonmaskable interrupt signaling without triggering full system reboot.

Reset assertion is synchronized to monitored voltage decay at 1mV/µs, with 20µs VCC-to-RESET delay and 15µs RSTIN-to-RESET delay. The 140ms minimum reset timeout is temperature-stable (±5% over -40°C to +85°C), and the device remains functional with VCC as low as 1.0V while sinking 50µA at VOL ≤ 0.3V.

Key Specifications

Pinout & Package

Package: SOT23-6, surface-mount, lead(Pb)-free (indicated by '+' suffix), 1.6mm × 2.9mm footprint, thermal pad not required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6453UT29S+, the MAX6454UT29S+ provides open-drain flexibility for multi-device reset buses, while TLV803EC29DBVR reduces footprint and cost at the expense of supervision sophistication and dual-output functionality.

Availability

MAX6454UT29S+ is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and cable modems requiring stable component supply, RoHS-compliant packaging, and extended temperature operation.

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 designs precision analog and mixed-signal ICs for power management, sensing, and interface applications across industrial, communications, and consumer markets.

The MAX6453–MAX6456 family targets embedded systems needing dual-threshold, low-power microprocessor supervision with independent reset and interrupt outputs - optimized for reliable boot integrity in cost-sensitive consumer 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 temperature. This value is fixed by the "29" suffix in the part number per Table 1 of the datasheet and applies specifically to the MAX6454UT29S+ variant - not inferred from adjacent models. The threshold is guaranteed across the full -40°C to +85°C operating range.

Does MAX6454UT29S+ support monitoring a secondary voltage lower than 1.0V?

Yes, MAX6454UT29S+ supports monitoring secondary voltages down to 0.63V via its RSTIN pin, which has a fixed internal threshold of 0.630V ±15mV. By connecting RSTIN to the center tap of an external resistor divider, designers can scale higher voltages (e.g., 1.2V, 1.8V) to meet this threshold - enabling precise supervision of sub-1.0V core rails without additional components.

How does the manual reset input (MR) affect the RESET output in MAX6454UT29S+?

In MAX6454UT29S+, the MR input affects only the MROUT output - it has no effect on the RESET output. Pulling MR low immediately asserts MROUT (active-low open-drain), which remains low for ≥140ms after MR returns high. This isolation allows MAX6454UT29S+ to provide dedicated interrupt signaling without inadvertently triggering a full system reboot.

What is the maximum supply voltage the MAX6454UT29S+ can tolerate on its VCC pin?

The MAX6454UT29S+ has an absolute maximum VCC rating of +6V, but its operational range is specified from 1.0V to 5.5V. Operation above 5.5V risks permanent damage, while operation below 1.0V invalidates the RESET output guarantee. For reliable supervision, VCC must remain within 1.0V–5.5V, with typical use cases centered on 1.8V, 2.5V, 3.3V, and 5.0V rails.

Can MAX6454UT29S+ be used in systems requiring reset assertion below 1.0V VCC?

No - MAX6454UT29S+ guarantees valid RESET output only down to VCC = 1.0V. Below this voltage, current-sinking capability degrades rapidly, and RESET may float. For applications requiring reset assertion at VCC < 1.0V, a different supervisor (e.g., MAX6453 with push-pull output plus external pulldown) or supplemental circuitry is necessary. The MAX6454UT29S+ datasheet explicitly states "Guaranteed Valid Reset Down to VCC = 1.0V" as a key specification.