Analog Devices Inc./Maxim Integrated MAX6455UT46S

Overview

MAX6455UT46S from Maxim Integrated is a dual-output µP supervisor IC with factory-set 4.625V VCC reset threshold and adjustable secondary voltage monitoring down to 0.63V. It features separate active-low push-pull RESET and MROUT outputs, manual reset input (MR) controlling both outputs, 140ms minimum reset timeout, and operates from 1.0V to 5.5V supply across –40°C to +85°C - used in set-top boxes and industrial equipment for coordinated soft/hard system reset.

For engineers reviewing the MAX6455UT46S datasheet, MAX6455UT46S pinout, MAX6455UT46S application, or MAX6455UT46S equivalent, this page delivers verified functional behavior, precise timing relationships (e.g., 3.36s MR extended setup), real-world reset threshold hysteresis (±2×VTH), and design-critical leakage specs (25–75kΩ MR pullup, <25nA RSTIN current) essential for brownout resilience and NMI-driven data preservation.

Technical Context

The MAX6455UT46S implements a dual-comparator architecture: one precision bandgap reference comparator monitors VCC against its fixed 4.625V threshold, while a second high-impedance comparator monitors RSTIN against a fixed 0.63V internal reference - enabling external resistor-divider configuration for secondary rail supervision. Its MR input controls both outputs via a two-stage logic path: short MR assertion (<3.36s) triggers only MROUT for interrupt signaling; sustained MR assertion (≥3.36s) asserts both MROUT and RESET for full system reboot.

This architecture enables deterministic interrupt-before-reset sequencing without external logic. The device guarantees valid RESET output down to VCC = 1.0V, uses BiCMOS process for low 6µA ICC, and incorporates glitch rejection (100ns) and transient immunity validated per typical operating characteristics curves - critical for noisy power-rail environments in consumer and industrial applications.

Key Specifications

Pinout & Package

MAX6455UT46S is housed in a 6-pin SOT23 package (U6-1 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant, with thermal pad not electrically connected. Pin 1 is marked by a dot or beveled edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6455UT44S and MAX6456UT46S, the MAX6455UT46S offers the highest VCC reset threshold in the family for 5V systems, push-pull outputs eliminating BOM cost and layout area for pullups, and identical interrupt-before-reset timing - making it optimal for new 5V designs prioritizing simplicity and noise immunity.

Availability

MAX6455UT46S is available at Aetrix Electronics and suitable for set-top box manufacturing, industrial PLC controller production, and automotive infotainment module assembly requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX6455UT46S 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6453–MAX6456 family was designed specifically for reliable power-supply monitoring and coordinated reset sequencing in space-constrained, low-power embedded systems - emphasizing precision thresholds, ultra-low ICC, and dual-output flexibility for NMI + reboot use cases.

FAQ

What is the exact VCC reset threshold voltage for MAX6455UT46S?

The MAX6455UT46S has a factory-trimmed VCC reset threshold of 4.625V, with ±1.5% tolerance over the full –40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet and corresponds to the "46" suffix in the part number. The threshold is internally generated and does not require external components, ensuring consistent performance across production units and operating conditions.

How does the manual reset input (MR) control both outputs in MAX6455UT46S?

In the MAX6455UT46S, the MR input controls both RESET and MROUT outputs based on assertion duration: a low pulse shorter than 3.36s (typical extended setup period) asserts only MROUT for interrupt signaling; a low pulse held ≥3.36s asserts both MROUT and RESET for full system reboot. This dual-mode behavior is intrinsic to the MAX6455/MAX6456 variant and is implemented in silicon - no external timing components are needed.

Can MAX6455UT46S monitor a 1.2V supply rail, and how is that configured?

Yes, the MAX6455UT46S can monitor a 1.2V rail using its RSTIN pin, which references an internal 0.63V threshold. To supervise 1.2V, connect RSTIN to the center tap of a resistor divider (e.g., R1 = 90.5kΩ, R2 = 100kΩ) between the 1.2V rail and ground. The formula VMON_TH = 0.63 × (R1 + R2)/R2 yields 1.2V. Input bias current is only ±25nA, minimizing impact on rail regulation.

What is the minimum VCC voltage at which MAX6455UT46S guarantees valid RESET output logic?

The MAX6455UT46S guarantees valid RESET output logic down to VCC = 1.0V, as specified in the Electrical Characteristics table. Below 1.0V, output sinking capability degrades, and RESET may float. For applications requiring valid reset down to 0V, a 100kΩ pulldown resistor must be added externally to the RESET pin - but only for push-pull versions like MAX6455UT46S, not open-drain variants.

Is MAX6455UT46S pin-compatible with other devices in the MAX6453–MAX6456 family?

Yes, all MAX6453–MAX6456 devices, including MAX6455UT46S, share identical SOT23-6 pinout and footprint (U6-1). However, functional differences exist: MAX6453/MAX6454 have MR affecting only MROUT, while MAX6455/MAX6456 have MR controlling both outputs; MAX6454/MAX6456 use open-drain outputs. Electrical compatibility requires verifying output type and MR behavior for the target application.