Analog Devices Inc./Maxim Integrated MAX6455UT16S

Overview

MAX6455UT16S from Maxim Integrated is a dual-output µP supervisor IC with separate VCC reset and manual reset outputs, designed for soft/hard-system reset combination in embedded power management. It features factory-set 1.575V VCC reset threshold, adjustable RSTIN input (0.63V reference), 3.36s extended MR setup timeout, 140ms min reset timeout, and push-pull active-low RESET/MROUT outputs in SOT23-6 package. Used in set-top boxes and industrial equipment requiring reliable brownout detection and controlled system recovery.

For engineers reviewing the MAX6455UT16S datasheet, MAX6455UT16S pinout, MAX6455UT16S application, or MAX6455UT16S equivalent, this page delivers verified electrical parameters, precise pin functionality, confirmed reset timing behavior, and validated alternative options for dual-reset supervisor selection in low-power microprocessor systems.

Technical Context

The MAX6455UT16S implements a dual-comparator architecture: one precision bandgap-based comparator monitors VCC against a fixed 1.575V threshold, while a second high-impedance comparator monitors RSTIN against a 0.63V internal reference-enabling external voltage monitoring via resistor divider. Its MR input controls both MROUT and RESET outputs based on pulse width: short pulses (<3.36s) assert only MROUT for interrupt signaling; long pulses (≥3.36s) assert both MROUT and RESET for full reboot.

This architecture supports interrupt-before-reset functionality without external logic: MROUT provides immediate nonmaskable interrupt (NMI) assertion, while RESET triggers full processor restart after extended MR hold. The device guarantees valid reset output down to VCC = 1.0V and exhibits immunity to transients ≤20µs when VCC drops 100mV below threshold.

Key Specifications

Pinout & Package

SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, gull-wing leads. RoHS-compliant lead(Pb)-free option available (suffix +T).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6453UT16S and TPS3808G15DBVR, the MAX6455UT16S uniquely integrates extended MR setup timing, dual push-pull outputs, and adjustable RSTIN monitoring-enabling compact, single-component interrupt-before-reset architectures without external logic or additional supervisors.

Availability

MAX6455UT16S is available at Aetrix Electronics and suitable for set-top boxes, industrial PLCs, medical infusion pumps, and DVD players requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for MAX6455UT16S 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, medical, and communications systems.

The MAX6453–MAX6456 family was developed specifically for microprocessor supervision in space-constrained, low-power embedded systems requiring robust brownout detection, flexible reset sequencing, and dual-output interrupt/reboot capability.

FAQ

What is the exact VCC reset threshold voltage for MAX6455UT16S?

The MAX6455UT16S has a factory-set VCC reset threshold of 1.575V, with ±1.5% tolerance over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed during production and specified in Table 1 of the datasheet. The "16" suffix in MAX6455UT16S explicitly denotes this 1.575V threshold, and the device guarantees valid reset assertion whenever VCC falls below this level.

How does the MR input function differently in MAX6455UT16S versus MAX6453UT16S?

In the MAX6455UT16S, the MR input controls both MROUT and RESET outputs depending on pulse width: short presses assert only MROUT, while holds ≥3.36s assert both outputs. In contrast, MAX6453UT16S MR affects only MROUT-RESET remains solely voltage-triggered. This difference makes MAX6455UT16S suitable for interrupt-before-reset designs, whereas MAX6453UT16S requires separate hardware for hard reset initiation.

Can MAX6455UT16S monitor a 1.8V supply using the RSTIN pin?

Yes. Using the RSTIN pin with an external resistor divider, MAX6455UT16S can monitor a 1.8V supply. With its 0.63V internal reference, a standard divider (e.g., R1 = 182kΩ, R2 = 100kΩ) sets VMON_TH = 0.63 × (182k + 100k)/100k ≈ 1.8V. The RSTIN input draws only ±25nA, minimizing divider current and enabling high-value resistors for low power consumption.

What is the minimum VCC voltage at which MAX6455UT16S guarantees valid RESET output?

The MAX6455UT16S guarantees valid RESET output down to VCC = 1.0V. Below this level, current-sinking capability degrades, and output logic state is not assured. This specification ensures reliable reset assertion during deep brownout conditions common in battery-powered or unregulated supply environments-critical for fail-safe operation in medical and industrial applications.

Does MAX6455UT16S require external pullup resistors on its RESET and MROUT pins?

No. The MAX6455UT16S features active-low push-pull outputs on both RESET and MROUT pins, eliminating the need for external pullup resistors. Each output actively drives low during assertion and high (to VCC) during deassertion. This simplifies PCB layout, reduces component count, and ensures defined logic levels without dependency on external biasing networks.