Analog Devices Inc./Maxim Integrated MAX981CUA-TG069

Overview

The MAX981CUA-TG069 from Maxim Integrated is a single-channel, ultra-low-power comparator with integrated 1.182V ±2% bandgap reference and programmable hysteresis via HYST pin. It operates from 2.5V to 11V single supply (or ±1.25V to ±5.5V dual supply), draws ≤4µA quiescent current over temperature, supports rail-to-rail input down to V− and within 1.3V of V+, and features open-drain output with separate GND pin for level translation. It is used in battery-powered threshold detectors requiring stable low-power sensing.

For engineers reviewing the MAX981CUA-TG069 datasheet, MAX981CUA-TG069 pinout, MAX981CUA-TG069 application, or MAX981CUA-TG069 equivalent, key selection criteria include guaranteed 4µA max supply current at +70°C, ±2% reference accuracy, 12µs propagation delay at 10mV overdrive, open-drain output sinking capability to GND, and µMAX-8 package compatibility with space-constrained portable designs.

Technical Context

The MAX981CUA-TG069 integrates a precision bandgap reference referenced to V− (not GND) and a single comparator with internal hysteresis control logic tied to the HYST pin. Its input common-mode range extends from V− to (V+ − 1.3V), enabling operation near supply rails without phase reversal.

It uses an N-channel open-drain output stage with dedicated GND terminal, allowing bipolar-to-single-ended conversion and level-shifting up to 11V output swing independent of V+ presence. The reference delivers 1.182V ±2% over 0°C to +70°C and supports ≤25µA source / ≤15µA sink load.

Key Specifications

Pinout & Package

Package: 8-pin µMAX (3mm × 3mm, exposed thermal pad). Pin numbering follows standard µMAX top-view orientation with Pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX971CUA+, the MAX981CUA-TG069 trades 1% reference accuracy for lower cost and broader tolerance in consumer-grade sensing; versus TLV3701IDBVR, it delivers integrated reference functionality and proven hysteresis implementation at the expense of slightly higher quiescent current-making it ideal for compact, self-contained threshold detection.

Availability

MAX981CUA-TG069 is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, level translators, and oscillator circuits requiring stable component supply with long-term manufacturability.

Supply support for MAX981CUA-TG069 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, and interface applications in industrial, medical, and communications markets.

The MAX971–MAX984 comparator family targets ultra-low-power, single/dual-supply sensing applications where micropower operation, integrated reference, and flexible hysteresis control are essential-enabling compact, long-life solutions in portable and remote systems.

FAQ

What is the maximum supply voltage for MAX981CUA-TG069?

The MAX981CUA-TG069 supports a maximum total supply voltage of 11V in single-supply mode (V+ to V−) or ±5.5V in dual-supply mode. Absolute maximum ratings specify V+ to V− or V+ to GND up to +12V, but functional operation is guaranteed only up to 11V. Exceeding this may cause permanent damage or parametric shift. The MAX981CUA-TG069 must not be operated beyond its specified 2.5V–11V single-supply range for reliable performance.

Does MAX981CUA-TG069 require an external reference?

No, the MAX981CUA-TG069 includes an internal 1.182V ±2% bandgap voltage reference referenced to V−, eliminating the need for external reference components in most threshold-detection applications. The REF pin provides this voltage directly and can drive resistor networks for HYST programming or external comparators. Bypassing REF is not recommended, as it degrades noise performance and reference stability.

Can MAX981CUA-TG069 operate from a 3V supply?

Yes, the MAX981CUA-TG069 is fully specified for operation from 2.5V to 11V single supply, including 3V nominal systems. At 3V, typical supply current is 3.0µA (C-temp range), input common-mode range extends from V− to 1.7V, and propagation delay remains 12µs at 10mV overdrive. The internal reference remains stable and accurate, making the MAX981CUA-TG069 well-suited for modern 3V microcontroller interfaces and low-voltage sensor nodes.

What is the purpose of the separate GND pin on MAX981CUA-TG069?

The separate GND pin (Pin 1) on the MAX981CUA-TG069 serves exclusively as the return path for the open-drain output transistor, decoupling output switching currents from the main V− supply and analog ground. This enables clean level translation-for example, accepting ±5V inputs while driving a 3.3V logic pull-up-and prevents ground bounce from corrupting sensitive analog measurements. It is not interchangeable with V− (Pin 2), which powers internal circuitry and references the REF output.

How is hysteresis programmed on MAX981CUA-TG069?

Hysteresis on the MAX981CUA-TG069 is programmed using the HYST pin (Pin 5) with two external resistors: R1 between REF and HYST, and R2 between HYST and V−. The voltage difference between REF and HYST sets the hysteresis band (V_HB ≈ 2 × (V_REF − V_HYST)), with a maximum of 100mV. For example, connecting HYST directly to REF yields zero hysteresis; adding R1 = 2.4MΩ and R2 = 2.4MΩ produces ~50mV hysteresis. This method avoids external feedback loops and preserves the MAX981CUA-TG069's ultra-low power advantage.