Analog Devices Inc./Maxim Integrated MAX6385XS37D7-T

Overview

MAX6385XS37D7-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.70V reset threshold, 1200ms VCC reset timeout, and manual reset input. It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, guarantees valid reset output down to VCC = 1V, and operates across –40°C to +125°C for use in industrial power-up sequencing and brownout protection.

For engineers reviewing the MAX6385XS37D7-T datasheet, MAX6385XS37D7-T pinout, MAX6385XS37D7-T application, or MAX6385XS37D7-T equivalent, key selection criteria include its active-high push-pull reset output, 3.70V ±2.5% threshold accuracy over temperature, 1200ms minimum VCC reset timeout, MR input with internal pullup, and 4-pin SC70 package compatibility with space-constrained embedded systems.

Technical Context

The device implements a precision voltage comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco, paired with a monolithic timer that enforces a guaranteed minimum 1200ms reset assertion after VCC recovers above 3.70V. Its MR input features debounced logic-level compatibility and an internal 63kΩ pullup resistor.

Reset assertion is triggered by either VCC falling below 3.70V or MR pulled low; deassertion occurs only after both conditions clear and the full timeout elapses. The push-pull output drives high during reset and low otherwise, eliminating need for external pullup resistors while ensuring rail-to-rail logic levels down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6385XS37D7-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.6mm × 1.6mm × 0.95mm with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS37D7-T, MAX809TRD3-T offers lower cost but omits MR and long timeout, while TPS3808G33DBVR adds flexibility at the expense of higher supply current and external component dependency - MAX6385XS37D7-T balances precision, integration, and industrial-grade timing in a compact 4-pin SC70.

Availability

MAX6385XS37D7-T is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, medical instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.

Supply support for MAX6385XS37D7-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 industrial, automotive, communications, and computing markets.

The MAX6381–MAX6390 family delivers low-power, high-accuracy reset supervision for microprocessor-based systems where supply stability, temperature resilience, and compact packaging are critical - specifically targeting applications demanding guaranteed reset behavior under brownout, cold-crank, and transient conditions.

FAQ

What is the exact reset threshold voltage of MAX6385XS37D7-T and how tightly is it specified?

The MAX6385XS37D7-T has a factory-set nominal reset threshold of 3.70V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This means the actual threshold falls between 3.61V and 3.79V at any temperature within that range, and the device's tempco is limited to 60ppm/°C to minimize drift across thermal cycles. This specification is confirmed in the Electrical Characteristics table of the official MAX6381–MAX6390 datasheet.

Does MAX6385XS37D7-T support manual reset, and what is the internal pullup value on the MR pin?

Yes, MAX6385XS37D7-T includes a debounced manual reset (MR) input with an internal 63kΩ pullup resistor to VCC. The MR pin is active-low and requires a logic-low pulse of at least 1µs to assert reset; the device then holds reset active for the full 1200ms VCC timeout period after MR is released. This eliminates need for external pullup components and supports direct connection to momentary switches or logic outputs.

What is the minimum supply voltage at which MAX6385XS37D7-T guarantees correct reset output logic state?

MAX6385XS37D7-T guarantees valid reset output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may not maintain defined behavior, but at or above 1.0V, the active-high push-pull output will correctly drive high during reset assertion and low otherwise - a key feature for systems experiencing deep brownout conditions where other supervisors may release prematurely.

Can MAX6385XS37D7-T be used in automotive applications, and what qualification does it carry?

MAX6385XS37D7-T is offered in a RoHS-compliant 4-pin SC70 package and is AEC-Q100 qualified per the ordering information in the MAX6381–MAX6390 datasheet. While the specific /V automotive grade suffix is optional (e.g., MAX6385XS37D7/V+T), the base MAX6385XS37D7-T meets AEC-Q100 stress test requirements for temperature cycling, HTOL, and ESD - making it suitable for under-hood and cabin modules where extended temperature operation and reliability are mandatory.

What package type and dimensions does MAX6385XS37D7-T use, and is it compatible with standard reflow profiles?

MAX6385XS37D7-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 1.6mm × 1.6mm × 0.95mm with gull-wing leads. It is rated for lead-free reflow soldering at peak temperatures up to +260°C (JEDEC J-STD-020), and its thermal resistance (θJA = 322.6°C/W on multilayer board) supports standard IPC-7095-compliant assembly processes without derating concerns in typical industrial PCB layouts.