Analog Devices Inc./Maxim Integrated MAX6385XS23D7-T

Overview

MAX6385XS23D7-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit with factory-set 2.31V reset threshold, 1200ms VCC reset timeout, and debounced manual reset input (MR). It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS23D7-T datasheet, MAX6385XS23D7-T pinout, MAX6385XS23D7-T application, or MAX6385XS23D7-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), MR input pullup resistance (63kΩ), open-drain vs. push-pull output compatibility, and SC70-4 package footprint constraints.

Technical Context

The MAX6385XS23D7-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over temperature and 60ppm/°C tempco. Its internal timer generates a guaranteed minimum 1200ms reset assertion after VCC rises above 2.31V.

It features a dedicated active-low manual reset input (MR) with internal 63kΩ pullup, supporting TTL/CMOS logic drive and requiring no external debounce. Reset output is push-pull active-high, sourcing up to 800µA at VCC ≥ 4.5V and sinking 3.2mA when asserted.

Key Specifications

Pinout & Package

MAX6385XS23D7-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. Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS23D7-T, the MAX6385XS23D4-T offers identical functionality with reduced timeout duration, while TPS3808G125DBVR trades push-pull simplicity for open-drain flexibility and wider input voltage support - both require layout review for output topology and pullup integration.

Availability

MAX6385XS23D7-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS23D7-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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for space-constrained, battery-sensitive applications where deterministic reset timing and minimal quiescent current are critical.

FAQ

What is the exact reset threshold voltage of the MAX6385XS23D7-T?

The MAX6385XS23D7-T has a factory-set reset threshold of 2.31V, with guaranteed accuracy of ±2.5% over the full operating temperature range (−40°C to +125°C). This value is fixed per the "23" suffix in the part number and confirmed in the Reset Thresholds table of the datasheet. The MAX6385XS23D7-T uses a precision bandgap reference to maintain stability against voltage and temperature drift.

Does the MAX6385XS23D7-T require an external pullup resistor on its RESET pin?

No, the MAX6385XS23D7-T does not require an external pullup resistor because it features an active-high push-pull RESET output. The internal driver sources current when reset is asserted (high) and sinks current when deasserted (low), eliminating dependency on external passive components. This simplifies PCB layout and improves noise immunity compared to open-drain alternatives. The MAX6385XS23D7-T's push-pull architecture is explicitly defined in the Pin Description and Features sections.

What is the function and electrical behavior of the MR pin on the MAX6385XS23D7-T?

The MR (Manual Reset) pin on the MAX6385XS23D7-T is an active-low input with an internal 63kΩ pullup resistor to VCC. Driving MR low forces a reset regardless of VCC level, and reset remains asserted for the full 1200ms timeout after MR is released. The MAX6385XS23D7-T guarantees MR glitch rejection of 100ns and accepts standard TTL/CMOS logic levels. No external debounce circuitry is needed due to integrated filtering.

Can the MAX6385XS23D7-T operate reliably at VCC = 1.2V?

Yes, the MAX6385XS23D7-T is fully specified to operate down to VCC = 1.0V, and its RESET output state is guaranteed valid at that level. At VCC = 1.2V, the device maintains accurate threshold detection and correct push-pull output logic levels (VOH ≥ 0.8×VCC, VOL ≤ 0.3V). This capability ensures safe microprocessor initialization during deep brownout conditions - a key specification validated in the Electrical Characteristics table of the MAX6385XS23D7-T datasheet.

Is the MAX6385XS23D7-T pin-compatible with older Maxim reset ICs like the MAX809?

Yes, the MAX6385XS23D7-T is pin-compatible with the MAX809, MAX810, MAX803, and other members of the legacy Maxim reset portfolio, as explicitly stated in the Features section of the datasheet. All share the same 4-pin SC70 pinout (VCC, RESET, MR, GND) and compatible voltage thresholds and timing. However, designers should verify MR pullup strength (63kΩ vs. MAX809's 100kΩ) and reset timeout (1200ms vs. MAX809's 240ms) for functional equivalence in existing layouts.