Analog Devices Inc./Maxim Integrated MAX6385XS17D5-T

Overview

MAX6385XS17D5-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 1.67V reset threshold (±2.5% over –40°C to +125°C), 280ms minimum VCC reset timeout, and integrated manual reset input (MR) with internal 63kΩ pullup. It monitors single supply voltage in battery-powered embedded systems where reliable power-on reset and brownout protection are critical.

For engineers reviewing the MAX6385XS17D5-T datasheet, MAX6385XS17D5-T pinout, MAX6385XS17D5-T application, or MAX6385XS17D5-T equivalent, key selection criteria include reset threshold accuracy at temperature extremes, guaranteed reset assertion down to VCC = 1V, MR debounce capability without external components, and compatibility with SC70-4 footprint for space-constrained designs.

Technical Context

The MAX6385XS17D5-T implements a precision bandgap-based voltage comparator with ±2.5% threshold tolerance across –40°C to +125°C and 60ppm/°C tempco. Its internal timer ensures reset remains asserted for ≥280ms after VCC rises above 1.67V, independent of supply ramp rate.

It features a dedicated active-low manual reset input (MR) with 1µs minimum pulse width support, 100ns glitch rejection, and 200ns MR-to-reset delay - enabling robust operator-initiated reset in noisy industrial environments without external filtering.

Key Specifications

Pinout & Package

MAX6385XS17D5-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, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS17D3-T, the MAX6385XS17D5-T provides double the reset timeout for robustness in slower-starting systems; versus TPS3808G16DBVR, it integrates MR but trades off absolute threshold precision for broader temperature stability and lower quiescent current.

Availability

MAX6385XS17D5-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply throughout product lifecycles.

Supply support for MAX6385XS17D5-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 demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervision for microprocessor systems where supply integrity directly impacts functional safety and data reliability.

FAQ

What is the exact reset threshold voltage of MAX6385XS17D5-T and how does it vary with temperature?

The MAX6385XS17D5-T has a nominal reset threshold of 1.67V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This corresponds to a minimum threshold of 1.62V and maximum of 1.71V at temperature extremes. The device exhibits a temperature coefficient of 60ppm/°C, meaning threshold drift is tightly bounded and predictable across thermal cycling - critical for applications like automotive body controllers where ambient temperature swings exceed 100°C.

Does MAX6385XS17D5-T require an external pullup resistor on its RESET output?

No, MAX6385XS17D5-T does not require an external pullup resistor on its RESET output because it features an active-high push-pull driver. The output actively drives high during reset assertion and low when deasserted, eliminating reliance on external components for logic level definition. This reduces bill-of-materials count and PCB area - particularly valuable in compact designs such as wearable health monitors where the MAX6385XS17D5-T supervises a 1.8V rail.

Can MAX6385XS17D5-T monitor a second voltage rail?

No, MAX6385XS17D5-T is a single-supply supervisor and does not support auxiliary voltage monitoring. It only monitors the VCC pin. For dual-rail supervision, consider MAX6387XS17D5-T (which adds RESET IN input) or MAX6389XS17D5-T. The MAX6385XS17D5-T's pinout and internal architecture are specifically optimized for cost-sensitive, space-constrained applications where only one critical rail - such as a microcontroller core supply - requires supervision.

What is the minimum pulse width required on the MR input of MAX6385XS17D5-T to trigger a reset?

The MR input of MAX6385XS17D5-T requires a minimum low pulse width of 1μs to reliably initiate a reset. This short requirement enables compatibility with fast digital logic, mechanical switches, and noise-filtered GPIO signals. The device also provides 100ns glitch rejection on MR, preventing false triggers from EMI or contact bounce. In practice, a standard tactile switch debounced by a 0.1μF capacitor from MR to GND ensures clean reset initiation - a configuration validated in the MAX6385XS17D5-T typical operating circuit.

Is MAX6385XS17D5-T qualified for automotive applications?

The base MAX6385XS17D5-T is not automotive-qualified; however, the /V variant (e.g., MAX6385XS17D5/V+T) is AEC-Q100 qualified for Grade 1 (–40°C to +125°C) operation. The /V suffix denotes automotive qualification, including stress testing for temperature cycling, humidity, and vibration. For body control unit or infotainment applications requiring automotive compliance, specify the /V version - which shares identical electrical specifications and pinout with MAX6385XS17D5-T but adds traceability, enhanced screening, and extended reliability documentation.