Analog Devices Inc./Maxim Integrated MAX6455UT16S+T

Overview

MAX6455UT16S+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with separate active-low push-pull RESET and MROUT outputs, factory-set 1.575V VCC reset threshold, adjustable RSTIN monitoring down to 0.63V, 140ms minimum reset timeout, and manual reset input supporting soft/hard reset combination via extended 3.36s setup period. It operates from 1.0V to 5.5V supply and is used in set-top boxes and consumer electronics for reliable power-on reset and controlled system recovery.

For engineers reviewing the MAX6455UT16S+T datasheet, MAX6455UT16S+T pinout, MAX6455UT16S+T application, or MAX6455UT16S+T equivalent, this page delivers verified circuit role, exact reset thresholds, manual reset timing behavior, SOT23-6 package mapping, and real-world implementation guidance for interrupt-before-reset and brownout immunity.

Technical Context

The MAX6455UT16S+T implements a dual-comparator architecture: one precision bandgap reference comparator monitors VCC against its factory-trimmed 1.575V threshold, while a second high-impedance comparator monitors RSTIN against a fixed 0.63V internal reference-enabling external voltage divider-based monitoring of secondary rails as low as 0.63V. Both comparators feed independent reset logic paths.

Its MR input controls both outputs: short MR assertion (<3.36s) triggers only MROUT for nonmaskable interrupt (NMI), while sustained MR assertion (≥3.36s) asserts both MROUT and RESET for full system reboot. The 140ms minimum timeout applies independently to both outputs, ensuring stable deassertion after voltage recovery or MR release.

Key Specifications

Pinout & Package

Package: SOT23-6, surface-mount, lead(Pb)-free (RoHS-compliant), -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 MAX6455UT16S+T, MAX6455UT23S+T offers identical architecture and layout compatibility but targets higher primary supply rails, while TPS3808G15DBVR sacrifices manual reset flexibility and secondary rail monitoring to reduce cost and complexity in simpler systems.

Availability

MAX6455UT16S+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and cable/DSL modems requiring stable component supply, long-term industrial availability, and RoHS-compliant packaging.

Supply support for MAX6455UT16S+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, designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, communications, and consumer markets.

The MAX6453–MAX6456 family was engineered specifically for dual-rail microprocessor supervision in space-constrained consumer electronics, delivering integrated soft/hard reset control and adjustable secondary voltage monitoring in a 6-pin SOT23 package.

FAQ

What is the exact VCC reset threshold voltage for MAX6455UT16S+T?

The MAX6455UT16S+T has a factory-trimmed VCC reset threshold of 1.575V, with ±1.5% tolerance over temperature. This value is confirmed in Table 1 of the datasheet where suffix "16" corresponds to nominal 1.575V, and electrical characteristics list min/typ/max as 1.52V/1.575V/1.62V. The threshold remains stable across the full -40°C to +85°C range with 60ppm/°C tempco.

Does MAX6455UT16S+T support monitoring a 1.2V secondary rail?

Yes, MAX6455UT16S+T supports monitoring a 1.2V secondary rail via its RSTIN pin using an external resistor divider. With a fixed 0.63V internal reference, a 1.2V threshold is achieved using R1 = 225kΩ and R2 = 250kΩ (per VMON_TH = 0.63 × (R1 + R2)/R2). The RSTIN input draws only ±25nA, minimizing divider current and power loss.

How does the manual reset function work on MAX6455UT16S+T?

On MAX6455UT16S+T, pulling MR low immediately asserts MROUT. If MR remains low for ≥3.36s (the extended setup period), RESET also asserts. After MR goes high, both MROUT and RESET remain low for ≥140ms before deasserting. This enables one pushbutton to trigger either NMI (short press) or full reboot (long press), as shown in Figure 2 of the datasheet.

Is MAX6455UT16S+T compatible with 1.0V VCC operation?

Yes, MAX6455UT16S+T guarantees valid RESET output down to VCC = 1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. At VCC = 1.0V, the push-pull RESET output maintains proper logic state with VOL ≤ 0.3V at 50µA sink current. Below 1.0V, external pulldown is required-only for push-pull variants like MAX6455UT16S+T.

What package type and RoHS status does MAX6455UT16S+T use?

MAX6455UT16S+T uses the SOT23-6 package (package code U6-1), with lead(Pb)-free RoHS-compliant construction. The "+T" suffix explicitly denotes lead-free tape-and-reel packaging, per Maxim's ordering convention. Thermal performance is rated at 696mW at +70°C with 8.7mW/°C derating above that temperature.