Analog Devices Inc./Maxim Integrated MAX6388XS16D3

Overview

MAX6388XS16D3 from Maxim Integrated is a single-supply, low-power microprocessor supervisory circuit with active-high push-pull reset output, 1.58V factory-set reset threshold, and 140ms minimum reset timeout period. It monitors VCC in systems operating from +1.8V to +5.0V, consumes only 3µA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6388XS16D3 datasheet, MAX6388XS16D3 pinout, MAX6388XS16D3 application, or MAX6388XS16D3 equivalent, this page delivers verified electrical parameters, SC70-4 package mapping, auxiliary RESET IN capability, ±2.5% threshold accuracy over –40°C to +125°C, and real-world design implications for dual-voltage monitoring and transient immunity.

Technical Context

The MAX6388XS16D3 integrates a precision voltage comparator referenced to an internal bandgap, a temperature-compensated reset timer, and an auxiliary RESET IN comparator tied to a +1.27V reference. Its reset assertion logic responds to either VCC falling below 1.58V or RESET IN falling below its derived threshold - enabling dual-rail monitoring without external comparators.

It features a dedicated high-impedance RESET IN input (50nA max leakage), supports resistor-divider configuration for user-defined secondary thresholds, and provides glitch rejection on MR and RESET IN inputs. The active-high push-pull output drives directly into µP reset pins without external pull-up components.

Key Specifications

Pinout & Package

MAX6388XS16D3 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.5mm, with wettable flanks for automated optical inspection. Pin 1 is marked by a dot; pin numbering follows standard SC70 orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6387XS16D3 and TLV809K33DBZR, the MAX6388XS16D3 uniquely combines 1.58V threshold, active-high push-pull output, and RESET IN capability in a 4-pin SC70 - making it the only option among the three that supports dual-rail supervision in space-constrained, low-voltage embedded systems without external components.

Availability

MAX6388XS16D3 is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O modules, smart energy meters, and battery-backed real-time clocks requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6388XS16D3 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, sensing, connectivity, and security applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family was engineered specifically for ultra-low-power, high-accuracy microprocessor supervision in space- and energy-constrained systems - emphasizing factory-trimmed thresholds, wide temperature operation, and flexible reset configurations including auxiliary voltage monitoring.

FAQ

What is the exact reset threshold voltage of MAX6388XS16D3?

The MAX6388XS16D3 has a factory-set reset threshold of 1.58V (minimum), with nominal value 1.62V and maximum 1.67V, specified over –40°C to +125°C with ±2.5% accuracy. This threshold is laser-trimmed during production and does not require external adjustment. The '16' suffix in MAX6388XS16D3 explicitly denotes the 1.58V–1.67V threshold range per Maxim's ordering guide.

Does MAX6388XS16D3 support monitoring of a second voltage rail?

Yes, MAX6388XS16D3 includes a dedicated RESET IN pin referenced to an internal +1.27V comparator. By connecting an external resistor divider to RESET IN, users can configure a custom reset threshold for a secondary voltage rail (e.g., I/O supply). The device asserts reset if either VCC falls below 1.58V or the voltage at RESET IN falls below its derived threshold - enabling true dual-rail supervision without additional ICs.

What is the function of the RESET output on MAX6388XS16D3?

The RESET output of MAX6388XS16D3 is an active-high push-pull driver. It transitions high when VCC drops below 1.58V or when RESET IN falls below its threshold, and remains high for a minimum of 140ms after the monitored voltage(s) recover. Unlike open-drain variants, it requires no external pull-up resistor and can directly drive standard µP reset inputs with VOH ≥ 0.8×VCC and VOL ≤ 0.4V across its operating range.

Can MAX6388XS16D3 operate reliably during severe supply transients?

Yes, MAX6388XS16D3 provides built-in immunity to short negative-going VCC transients: it will not assert reset for glitches ≤35µs duration when the overdrive (VTH – VCC) is 100mV, per typical operating characteristics. This behavior is inherent to its comparator design and requires no external RC filtering. For enhanced immunity, Maxim recommends placing a 0.1µF capacitor close to the VCC pin.

What package type and dimensions does MAX6388XS16D3 use?

MAX6388XS16D3 is supplied in a lead-free 4-pin SC70 package (package code X4-1), with outline dimensions of 1.0mm × 1.0mm × 0.5mm and wettable flanks. Pin 1 is marked by a dot; the pinout is VCC (1), RESET (2), RESET IN (3), GND (4). This package enables high-density placement and compatibility with standard reflow profiles for automated assembly.