Analog Devices Inc./Maxim Integrated MAX6386XS26D2+TG05

Overview

MAX6386XS26D2+TG05 from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.63V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, and debounced manual reset input (MR) featuring internal 63kΩ pullup. It monitors single supply voltage in battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6386XS26D2+TG05 datasheet, MAX6386XS26D2+TG05 pinout, MAX6386XS26D2+TG05 application, or MAX6386XS26D2+TG05 equivalent, key selection criteria include its 2.63V VTH accuracy, 20ms tRP timing, MR input compatibility with TTL/CMOS logic, guaranteed RESET validity down to VCC = 1V, and SC70-4 package footprint.

Technical Context

The MAX6386XS26D2+TG05 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 20ms minimum reset assertion period after VCC recovery or MR release.

It features an open-drain RESET output requiring external pullup, a debounced MR input with 1µs minimum pulse width and 100ns glitch rejection, and operates with only 3µA supply current at +1.8V - enabling use in ultra-low-power portable applications where supply rail stability must be validated before μP initialization.

Key Specifications

Pinout & Package

MAX6386XS26D2+TG05 is housed in a RoHS-compliant 4-pin SC70 package (package code X4+1), measuring 2.0mm × 2.1mm × 0.95mm, with 0.65mm pin pitch and exposed pad option not applicable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G12QDBVRQ1, MAX6386XS26D2+TG05 uniquely combines factory-set 2.63V detection, 20ms fixed timeout, integrated MR input, and SC70-4 footprint - making it optimal for space-constrained, battery-sensitive designs requiring deterministic reset behavior without external components.

Availability

MAX6386XS26D2+TG05 is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O submodules, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX6386XS26D2+TG05 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 demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy μP supervisory circuits optimized for battery-powered and thermally harsh environments where deterministic reset timing and minimal supply current are critical.

FAQ

What is the exact reset threshold voltage of MAX6386XS26D2+TG05 and how accurate is it over temperature?

The MAX6386XS26D2+TG05 has a nominal reset threshold of 2.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet, where VTH min/max values are listed as 2.56V and 2.69V at +25°C, and the same ±2.5% tolerance applies across temperature. The device uses a precision bandgap reference and laser-trimmed resistors to achieve this stability.

Does MAX6386XS26D2+TG05 require an external pullup resistor on the RESET pin?

Yes, MAX6386XS26D2+TG05 requires an external pullup resistor on the RESET pin because it features an open-drain active-low output. The datasheet explicitly states that "Open-drain requires an external pullup resistor." Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. Without this pullup, the RESET signal cannot transition high and will remain floating or weakly pulled low through leakage paths.

What is the function and electrical behavior of the MR pin on MAX6386XS26D2+TG05?

The MR (Manual Reset) pin on MAX6386XS26D2+TG05 is an active-low input that forces a reset when pulled below 0.3×VCC. It features an internal 63kΩ pullup resistor to VCC, allowing direct connection to a momentary switch tied to GND. The datasheet specifies 1µs minimum pulse width, 100ns glitch rejection, and MR-to-RESET delay of 200ns. When MR is asserted, reset remains active for the full 20ms timeout period after MR is released.

Can MAX6386XS26D2+TG05 operate reliably at VCC = 1.0V, and what happens to the RESET output at that voltage?

Yes, MAX6386XS26D2+TG05 is guaranteed to maintain correct RESET logic state down to VCC = 1.0V, as stated in both the Absolute Maximum Ratings and Detailed Description sections. At VCC = 1.0V, the open-drain RESET output remains functional with VOL ≤ 0.3V at ISINK = 80µA, ensuring clean low-state assertion. However, the device does not guarantee operation below 1.0V, and RESET behavior becomes undefined below that level.

Is MAX6386XS26D2+TG05 pin-compatible with older Maxim reset ICs like MAX809?

No, MAX6386XS26D2+TG05 is not pin-compatible with MAX809. While the datasheet notes "pin compatible with MAX809/MAX810…" for the *family*, this refers to functional equivalence and shared footprint categories-not identical pinouts. MAX6386XS26D2+TG05 uses a 4-pin SC70 package (VCC, RESET, MR, GND), whereas MAX809 uses a 3-pin SOT23 (VCC, GND, RESET). The MR pin adds a fourth terminal, making direct substitution impossible without PCB revision.