Analog Devices Inc./Maxim Integrated MAX6385XS46D6-T

Overview

MAX6385XS46D6-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.63V reset threshold, 560ms minimum VCC reset timeout, and manual reset input. It monitors single-supply rails from +1.8V to +5.5V while consuming only 3µA at +1.8V, and guarantees valid reset output down to VCC = 1V. Used in battery-powered controllers and critical μP power-up sequencing.

For engineers reviewing the MAX6385XS46D6-T datasheet, MAX6385XS46D6-T pinout, MAX6385XS46D6-T application, or MAX6385XS46D6-T equivalent, key selection factors include its active-high push-pull reset output, ±2.5% threshold accuracy over –40°C to +125°C, 4-pin SC70 package, MR debouncing capability, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.

Technical Context

The MAX6385XS46D6-T implements a precision voltage comparator with internal 4.63V reference and a monostable timer for reset assertion. Its MR input features an internal 63kΩ pullup resistor and supports TTL/CMOS logic levels, enabling direct switch or logic-driven manual reset without external components.

Reset assertion occurs when VCC falls below 4.63V (±2.5% over temperature), and the active-high RESET output remains asserted for ≥560ms after VCC rises above threshold. The device operates across full industrial temperature range (–40°C to +125°C) and maintains guaranteed logic state validity down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6385XS46D6-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR46D6+T and TLV803EB46DBZR, the MAX6385XS46D6-T uniquely combines active-high push-pull output, integrated debounced MR, and industry-leading 3µA supply current - making it optimal for space- and power-constrained μP systems requiring robust manual and supply-voltage reset control.

Availability

MAX6385XS46D6-T is available at Aetrix Electronics and suitable for battery-powered controllers, industrial PLC modules, automotive body control units, and medical diagnostic handhelds requiring stable component supply and long-term production continuity.

Supply support for MAX6385XS46D6-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, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for reliable μP reset generation in space-constrained, battery-sensitive, and thermally demanding systems.

FAQ

What is the exact reset threshold voltage of the MAX6385XS46D6-T?

The MAX6385XS46D6-T has a factory-set nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet and applies specifically to the "46" suffix in the part number. The MAX6385XS46D6-T uses this fixed threshold to monitor VCC and assert reset when the supply falls below this level.

Does the MAX6385XS46D6-T support manual reset, and how is it implemented?

Yes, the MAX6385XS46D6-T includes a debounced manual reset input (MR) on Pin 3. It features an internal 63kΩ pullup resistor to VCC, so the pin can be left unconnected or tied directly to a normally open momentary switch to ground. When MR is pulled low, the device asserts the active-high RESET output for the full 560ms timeout period after MR is released. This eliminates the need for external debounce circuitry, and the MAX6385XS46D6-T guarantees correct MR timing across temperature.

What package type and dimensions does the MAX6385XS46D6-T use?

The MAX6385XS46D6-T is packaged in a lead-free, RoHS-compliant 4-pin SC70 (SOT-323) package with outline number 21-0098 and land pattern 90-0187. Its footprint measures 2.0mm × 2.1mm, with a maximum height of 0.95mm. This compact package is explicitly listed in the Ordering Information table for MAX6385XS_ _D_+T variants and is distinct from the 3-pin SC70 used by MAX6381–MAX6383 or the 6-pin μDFN used by LT-suffixed versions.

How does the MAX6385XS46D6-T behave during VCC brownout conditions?

During VCC brownout, the MAX6385XS46D6-T asserts its active-high RESET output when VCC falls below 4.63V (±2.5%). RESET remains asserted for a minimum of 560ms after VCC rises back above the threshold. Crucially, the MAX6385XS46D6-T guarantees valid logic states on RESET down to VCC = 1V, ensuring deterministic reset behavior even during deep undervoltage events - a feature confirmed in the Electrical Characteristics table and Detailed Description section.

Is the MAX6385XS46D6-T pin-compatible with older Maxim reset ICs like the MAX809?

Yes, the MAX6385XS46D6-T is pin-compatible with the MAX809/MAX810 series in the same 4-pin SC70 package, as stated in the Features section of the datasheet. However, unlike the MAX809 (which offers only active-low reset), the MAX6385XS46D6-T provides active-high push-pull output and includes a manual reset input - meaning direct replacement is functionally possible only if the target system expects active-high signaling and can accommodate the MR pin's default high state.