Analog Devices Inc./Maxim Integrated MAX6385XS33D6-T

Overview

MAX6385XS33D6-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.3V reset threshold, 560ms minimum VCC reset timeout, and manual reset input. It monitors single-supply voltage (1.0V–5.5V), consumes only 3μA at 1.8V, and guarantees valid reset output down to VCC = 1V. Used in battery-powered controllers and critical μP power monitoring.

For engineers reviewing the MAX6385XS33D6-T datasheet, MAX6385XS33D6-T pinout, MAX6385XS33D6-T application, or MAX6385XS33D6-T equivalent, key selection factors include its active-high push-pull output, 3.3V ±2.5% threshold accuracy over –40°C to +125°C, 560ms reset timeout, manual reset debounce capability, and 4-pin SC70 package compatibility with space-constrained embedded designs.

Technical Context

The MAX6385XS33D6-T implements a precision bandgap-based voltage comparator for VCC monitoring and an internal monostable timer for reset assertion timing. Its MR input features a 63kΩ internal pullup resistor and supports TTL/CMOS logic levels.

It asserts RESET high when VCC falls below 3.3V (±2.5% over temperature) or MR is pulled low, holding RESET high for ≥560ms after VCC recovers or MR is released. Reset state remains valid down to VCC = 1V, enabling reliable operation during brownout conditions.

Key Specifications

Pinout & Package

MAX6385XS33D6-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.6mm × 0.95mm, suitable 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 MAX809TRD3-T and TPS3808G33DBVR, MAX6385XS33D6-T uniquely combines 3.3V threshold, 560ms timeout, active-high push-pull output, and debounced MR in a 4-pin SC70 - making it optimal for compact, manually resettable embedded systems needing long reset hold times and minimal external components.

Availability

MAX6385XS33D6-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body control modules, and smart energy meters requiring stable component supply and long-term production continuity.

Supply support for MAX6385XS33D6-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 power management, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for space-constrained, battery-sensitive, and thermally demanding embedded systems requiring guaranteed reset behavior across wide voltage and temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6385XS33D6-T and how does it vary with temperature?

The MAX6385XS33D6-T has a nominal reset threshold of 3.3V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. At +25°C, the threshold is specified as 3.22V (min) to 3.38V (max). This tight tolerance ensures reliable brownout detection without requiring system-level calibration, and the 60ppm/°C tempco minimizes drift across thermal cycles.

Does MAX6385XS33D6-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS33D6-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, MR must be driven below 0.3×VCC (for VTH < 4V) for ≥1µs. The MR pin accepts TTL/CMOS logic levels and can be connected directly to a normally open momentary switch tied to GND. No external debounce components are needed due to built-in filtering.

What is the function of the RESET output on MAX6385XS33D6-T, and what load can it drive?

The RESET output of MAX6385XS33D6-T is an active-high push-pull driver. When asserted (high), it sources current; when deasserted (low), it sinks current. It can source up to 800µA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sink up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V). This allows direct connection to most μP reset inputs without external level-shifting or pullup resistors.

Is MAX6385XS33D6-T qualified for automotive applications, and what packaging does it use?

MAX6385XS33D6-T is not explicitly marked with the /V automotive qualification suffix in its ordering code, and the datasheet does not list it in the AEC-Q100 qualified versions table. It uses a lead-free, RoHS-compliant 4-pin SC70 package (outline 21-0098), rated for –40°C to +125°C operation, but formal automotive qualification requires verification of the specific /V variant (e.g., MAX6385XS33D6/V+T).

How does the 560ms reset timeout of MAX6385XS33D6-T compare to other members of the MAX6381–MAX6390 family?

The 560ms reset timeout corresponds to the D6 suffix in the MAX6385XS33D6-T part number and is one of seven standard delays available across the family. It sits between the 280ms (D5) and 1120ms (D4) options, offering a balanced hold time for mid-speed μPs - longer than basic 1ms or 20ms timeouts used in simple logic systems, yet shorter than the 1200ms (D7) option reserved for complex boot sequences requiring extended initialization windows.