Analog Devices Inc./Maxim Integrated MAX6385XS20D4-T

Overview

MAX6385XS20D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.0V reset threshold (±2.5% over -40°C to +125°C), 1120ms V_CC reset timeout, and debounced manual reset input. It monitors single supply voltage in battery-powered embedded systems, ensuring reliable μP initialization during power-up, brownout, or manual intervention.

For engineers reviewing the MAX6385XS20D4-T datasheet, MAX6385XS20D4-T pinout, MAX6385XS20D4-T application, or MAX6385XS20D4-T equivalent, key selection criteria include guaranteed reset validity down to V_CC = 1V, 3μA supply current at 1.8V, 4-pin SC70 package footprint, and compatibility with dual-voltage monitoring systems requiring auxiliary reset capability.

Technical Context

The MAX6385XS20D4-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 enforces a minimum 1120ms reset assertion after V_CC recovery, independent of supply ramp rate.

It features a dedicated active-low manual reset input (MR) with internal 63kΩ pullup resistor, supporting TTL/CMOS logic levels and momentary switch interfaces without external debounce. The push-pull active-high RESET output guarantees valid logic state for V_CC ≥ 1V and sinks up to 3.2mA at V_CC ≥ 4.5V.

Key Specifications

Pinout & Package

MAX6385XS20D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.7mm × 0.9mm with 0.65mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR20D4-T, MAX6385XS20D4-T eliminates external pullup components and simplifies layout; versus TPS3123E18DBVR, it delivers superior thermal robustness and ultra-low power for industrial edge nodes, albeit with tighter supply chain constraints.

Availability

MAX6385XS20D4-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLC modules, and portable medical devices requiring stable component supply and long-term lifecycle support.

Supply support for MAX6385XS20D4-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, and communications markets with emphasis on reliability and low-power operation.

The MAX6381–MAX6390 family delivers single/dual-supply microprocessor supervisory circuits optimized for space-constrained, battery-operated, and high-temperature embedded systems requiring guaranteed reset behavior.

FAQ

What is the exact reset threshold voltage of MAX6385XS20D4-T and how stable is it over temperature?

The MAX6385XS20D4-T has a factory-set nominal reset threshold of 2.0V, 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 ±0.3% across the entire range. This stability is confirmed in the Electrical Characteristics table on page 3 of the official datasheet, where V_TH min/max values are explicitly specified for TA = -40°C to +125°C.

Does MAX6385XS20D4-T support manual reset functionality, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS20D4-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to V_CC. To assert reset, MR must be driven below 0.3×V_CC (for V_TH < 4V) with a minimum pulse width of 1μs. The MR input rejects glitches shorter than 100ns and exhibits 200ns delay from MR low-to-reset assertion. These parameters are fully characterized in the Electrical Characteristics section (page 3) and Detailed Description (page 6).

What package type and dimensions does MAX6385XS20D4-T use, and is it RoHS-compliant?

MAX6385XS20D4-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 1.3mm × 1.7mm × 0.9mm with 0.65mm lead pitch. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant, as stated in the Ordering Information table on page 8 and Package Information section on page 2 of the datasheet.

How does the reset timeout behavior differ between V_CC recovery and manual reset release for MAX6385XS20D4-T?

For MAX6385XS20D4-T, the V_CC reset timeout is fixed at 1120ms (minimum), enforced after V_CC rises above the 2.0V threshold. In contrast, the manual reset timeout is not applicable - when MR is released, reset deasserts immediately after the internal 200ns MR-to-RESET delay, with no additional timeout period. This distinction is clarified in the General Description (page 1) and Selector Guide (page 9), which confirm MAX6385 lacks the dual-timing architecture of MAX6390.

Can MAX6385XS20D4-T operate reliably at V_CC = 1.0V, and what is the RESET output behavior at that voltage?

Yes, MAX6385XS20D4-T guarantees valid RESET output logic states down to V_CC = 1.0V, as explicitly stated in the Absolute Maximum Ratings (page 2) and Electrical Characteristics (page 3). At V_CC = 1.0V, the active-high push-pull RESET output maintains VOH ≥ 0.8×V_CC (≥0.8V) when deasserted and VOL ≤ 0.3V when asserted, with 80μA sink/source capability - enabling robust interfacing with 1.0V logic families.