Analog Devices Inc./Maxim Integrated MAX6385XS29D3-T

Overview

MAX6385XS29D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.93V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors single supply voltage in battery-powered embedded systems and ensures reliable μP initialization during brownout or power-up.

For engineers reviewing the MAX6385XS29D3-T datasheet, MAX6385XS29D3-T pinout, MAX6385XS29D3-T application, or MAX6385XS29D3-T equivalent, key selection criteria include its 3μA supply current at 1.8V, guaranteed reset validity down to VCC = 1V, 4-pin SC70 package footprint, and compatibility with dual-voltage monitoring architectures requiring manual reset capability.

Technical Context

The MAX6385XS29D3-T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset assertion period after VCC recovers above 2.93V.

It features an internal 63kΩ pullup on the MR pin, accepts TTL/CMOS-compatible logic levels, and guarantees correct RESET output state for VCC ≥ 1V. The active-high push-pull output drives high during reset assertion and sinks up to 1.2mA at VCC ≥ 2.5V with VOL ≤ 0.3V.

Key Specifications

Pinout & Package

MAX6385XS29D3-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 MAX6385XS29D3-T, the μDFN-packaged MAX6385LT29D3-T offers superior thermal performance in thermally dense layouts, while the MAX6326XR29D3-T trades 7μA extra quiescent current for broader distributor stock and longer production lifecycle visibility.

Availability

MAX6385XS29D3-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered telematics units, medical infusion pumps, and smart energy meters requiring stable component supply with guaranteed long-term sourcing.

Supply support for MAX6385XS29D3-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 medical applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual-supply microprocessor supervisory circuits optimized for space-constrained, battery-operated, and safety-critical embedded systems requiring guaranteed reset timing and ultra-low ICC.

FAQ

What is the exact reset threshold voltage of MAX6385XS29D3-T and how stable is it over temperature?

The MAX6385XS29D3-T has a factory-set nominal reset threshold of 2.93V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning threshold drift is limited to ±0.018V across the entire range. This stability ensures consistent brownout detection in automotive engine control units and industrial automation hardware where supply rails fluctuate with ambient conditions.

Does MAX6385XS29D3-T support manual reset functionality, and how is it implemented?

Yes, MAX6385XS29D3-T includes a debounced manual reset input (MR) pin with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, which remains active for the full 140ms timeout after MR is released. No external debounce components are needed - the internal circuitry filters switch bounce, making MAX6385XS29D3-T ideal for medical device emergency stop buttons and field-service reset interfaces.

What package type and dimensions does MAX6385XS29D3-T use, and is it RoHS-compliant?

MAX6385XS29D3-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. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact footprint enables high-density placement in portable diagnostics equipment and wearables where board area is at a premium.

Can MAX6385XS29D3-T operate reliably at very low supply voltages, and what is its minimum functional VCC?

Yes, MAX6385XS29D3-T guarantees correct reset output logic state down to VCC = 1.0V, per Absolute Maximum Ratings and Electrical Characteristics tables. Its active-high push-pull output remains valid through deep brownout conditions, ensuring the connected microprocessor receives unambiguous reset signaling even as the main supply collapses - critical for preventing undefined states in safety-critical firmware.

How does the reset timeout behavior differ between power-up recovery and manual reset on MAX6385XS29D3-T?

MAX6385XS29D3-T applies the same 140ms minimum timeout period for both VCC recovery and manual reset release - unlike the MAX6390 family which separates VCC and MR timeouts. When VCC rises above 2.93V or MR transitions from low to high, the RESET output remains asserted high for ≥140ms before deasserting. This uniform timing simplifies system-level timing budgeting in resource-constrained microcontrollers.