Analog Devices Inc./Maxim Integrated MAX6454UT31S+T

Overview

MAX6454UT31S+T 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 primary supply (VCC) at 3.075V threshold and secondary supply via adjustable RSTIN input down to 0.63V, asserts reset for ≥140ms after fault clearance, and supports soft-system interrupt (MROUT) and hard-system reboot (RESET) functions in consumer and industrial embedded systems.

For engineers reviewing the MAX6454UT31S+T datasheet, MAX6454UT31S+T pinout, MAX6454UT31S+T application, or MAX6454UT31S+T equivalent, this page delivers verified electrical parameters, SOT23-6 package layout, functional differences vs. MAX6453/MAX6456 variants, and design-critical timing behavior including 3.36s extended MR setup period and guaranteed reset validity down to VCC = 1.0V.

Technical Context

The MAX6454UT31S+T implements independent monitoring paths: VCC is compared against a factory-set 3.075V threshold with 60ppm/°C tempco and 2×VTH hysteresis, while RSTIN accepts externally scaled voltages via resistor divider referenced to 0.63V internal comparator. Its MR input controls only MROUT - not RESET - enabling non-disruptive NMI generation without triggering full system reboot.

Reset assertion occurs when either VCC < 3.075V or RSTIN < 0.63V; deassertion requires both inputs to exceed thresholds plus ≥140ms timeout. The 1.12–10.08s MR setup period (S-suffix = 3.36s typical) is implemented via internal timer, and open-drain outputs require external pullups for logic-level compatibility across 0–6V domains.

Key Specifications

Pinout & Package

Package: SOT23-6, surface-mount, lead(Pb)-free (indicated by "+T" suffix), -40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6454UT31S+T, MAX6453UT31S+T eliminates external pullup requirements but sacrifices bus-sharing flexibility, while MAX6456UT31S+T adds dual-output control at the cost of MR logic complexity - choose based on whether reset path isolation or unified control is prioritized in the system architecture.

Availability

MAX6454UT31S+T is available at Aetrix Electronics and suitable for set-top boxes, cable/DSL modems, and industrial equipment requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C operation.

Supply support for MAX6454UT31S+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 designs precision analog and mixed-signal semiconductor solutions for power, sensing, connectivity, and security applications.

The MAX6453–MAX6456 family delivers dual-path µP supervision targeting cost-sensitive consumer and industrial systems needing independent VCC and auxiliary rail monitoring with configurable reset behavior.

FAQ

What is the exact VCC reset threshold voltage for MAX6454UT31S+T?

The MAX6454UT31S+T has a factory-set VCC reset threshold of 3.075V, with tolerance of ±0.075V (min 3.00V, max 3.15V) over temperature. This value is fixed by the "31" suffix per Table 1 and applies specifically to the MAX6454UT31S+T - not inferred from adjacent part numbers. The threshold exhibits 60ppm/°C tempco and includes 2×VTH hysteresis for noise immunity.

Does MAX6454UT31S+T support monitoring a 1.8V supply using the RSTIN pin?

Yes, MAX6454UT31S+T supports monitoring a 1.8V supply via RSTIN using an external resistor divider. With RSTIN's fixed 0.63V threshold, a divider ratio of (1.8V / 0.63V) ≈ 2.86 means R1/R2 ≈ 1.86. For example, using R2 = 250kΩ yields R1 ≈ 465kΩ. The MAX6454UT31S+T's <25nA RSTIN input current ensures minimal loading and high accuracy.

How does the MR input affect the RESET output in MAX6454UT31S+T?

In MAX6454UT31S+T, the MR input has no effect on the RESET output. MR exclusively controls the MROUT signal: pulling MR low asserts MROUT immediately, and MROUT remains low for ≥140ms after MR returns high. RESET is driven solely by VCC and RSTIN voltage conditions - this isolation is a defining feature distinguishing MAX6454UT31S+T from MAX6455/MAX6456 variants.

What is the purpose of the "S" suffix in MAX6454UT31S+T?

The "S" suffix in MAX6454UT31S+T specifies a 3.36s typical manual reset (MR) setup period - the minimum time MR must be held low to initiate certain timing sequences. Though MR does not affect RESET in this variant, the S-suffix configures internal timing for MROUT assertion consistency and transient rejection. This value is confirmed in Table 2 and applies identically across MAX6453–MAX6456 families with matching suffixes.

Can MAX6454UT31S+T operate with VCC as low as 1.0V and still assert a valid RESET?

Yes, MAX6454UT31S+T guarantees valid RESET output down to VCC = 1.0V. At this voltage, the open-drain RESET output maintains sink capability of ≥50µA with VOL ≤ 0.3V, ensuring clean logic-low assertion into standard CMOS inputs. This specification is explicitly guaranteed in the Electrical Characteristics table and enables robust operation during slow power-up or brownout recovery scenarios.