Analog Devices Inc./Maxim Integrated MAX6390XS16D4+T

Overview

MAX6390XS16D4+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 1.58V VCC reset threshold (±2.5% over -40°C to +125°C), 1120ms minimum VCC reset timeout, and 140ms minimum manual reset timeout. It monitors single-supply voltage in battery-powered or space-constrained embedded systems requiring guaranteed reset assertion down to VCC = 1V.

For engineers reviewing the MAX6390XS16D4+T datasheet, MAX6390XS16D4+T pinout, MAX6390XS16D4+T application, or MAX6390XS16D4+T equivalent, key selection criteria include its dual-timing reset architecture (VCC vs. MR timeout), SC70-4 package footprint, ±2.5% threshold accuracy over temperature, and compatibility with 1.8V–5.0V supply rails in portable and automotive-grade designs.

Technical Context

The MAX6390XS16D4+T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and guarantees valid reset state down to VCC = 1V. Its internal timer provides two independent timeout periods: 1120ms for power-on/power-fail detection and 140ms for manual reset debouncing.

It features an active-low manual reset input (MR) with 1.56kΩ internal pullup resistor, enabling direct connection to momentary switches without external components. The open-drain RESET output requires an external pullup and supports sink currents up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V.

Key Specifications

Pinout & Package

MAX6390XS16D4+T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), optimized for high-density routing and thermal performance (θJA = 322.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6390XS16D4+T, MAX6326XR16D4+T simplifies design where manual reset is unnecessary, while TPS3808G16DBVR adds watchdog capability and tighter threshold tolerance at the cost of increased package size and non-drop-in replacement.

Availability

MAX6390XS16D4+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O cards, and smart metering subsystems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6390XS16D4+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 computing applications.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for battery-operated and thermally harsh environments, with emphasis on AEC-Q100 qualification and compact packaging.

FAQ

What is the exact reset threshold voltage of MAX6390XS16D4+T?

The MAX6390XS16D4+T has a factory-set VCC reset threshold of 1.58V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is fixed per the "16" suffix in the part number and is confirmed in the Reset Thresholds table of the official datasheet. The MAX6390XS16D4+T does not support adjustable thresholds or auxiliary voltage monitoring.

Does MAX6390XS16D4+T support manual reset functionality?

Yes, MAX6390XS16D4+T includes an active-low manual reset input (MR) with a 1.56kΩ internal pullup resistor. Driving MR to GND forces reset assertion for a guaranteed minimum 140ms after release. This feature enables pushbutton-initiated resets without external components, distinguishing it from earlier MAX6381–MAX6383 variants that lack MR.

What are the timing specifications for MAX6390XS16D4+T's reset outputs?

MAX6390XS16D4+T provides two distinct timeout periods: a 1120ms minimum reset timeout for VCC-related events (power-up/brownout), and a 140ms minimum timeout for manual reset (MR) events. Both are specified under worst-case conditions and are independent-MR assertion does not override or shorten the VCC timeout period.

Can MAX6390XS16D4+T operate reliably at VCC = 1.2V?

Yes, MAX6390XS16D4+T guarantees correct reset output logic state down to VCC = 1V, including proper assertion and deassertion timing. At 1.2V, the device draws approximately 4μA supply current and maintains ±2.5% threshold accuracy. However, the open-drain RESET output requires an external pullup to a compatible voltage domain to ensure valid high-level signaling.

Is MAX6390XS16D4+T pin-compatible with other devices in the MAX6381–MAX6390 family?

MAX6390XS16D4+T uses the 4-pin SC70 package shared with MAX6384–MAX6386 and MAX6387–MAX6389, but pin functions differ: Pin 3 is MR (not N.C. or RESET IN), and Pin 2 is open-drain RESET (not push-pull). It is not pin-compatible with 3-pin SC70 or 6-pin μDFN variants. Direct replacement requires matching both package and functional pin mapping.