Analog Devices Inc./Maxim Integrated MAX983CUA

Overview

MAX983CUA from Maxim Integrated is a dual, ultra-low-power, open-drain comparator with internal 1.182V ±2% voltage reference and programmable hysteresis via HYST pin. It operates from single 2.5V–11V or dual ±1.25V–±5.5V supplies, draws ≤4µA supply current over temperature, supports rail-to-rail input down to V− and within 1.3V of V+, and is packaged in an 8-pin µMAX. It is used in battery-powered threshold detectors requiring stable low-current operation.

For engineers reviewing the MAX983CUA datasheet, MAX983CUA pinout, MAX983CUA application, or MAX983CUA equivalent, key selection criteria include its dual-comparator architecture with shared reference, hysteresis configurability without external feedback, open-drain output compatibility with wire-OR logic, and guaranteed operation across 0°C to +70°C in space-constrained µMAX packaging.

Technical Context

The MAX983CUA integrates two independent comparators sharing a common internal bandgap reference (1.182V ±2% at 0°C to +70°C) and a dedicated HYST pin enabling user-programmable hysteresis using only two external resistors. Its input common-mode range extends from V− to (V+ − 1.3V), supporting single-supply operation with GND tied to V−.

Both outputs are open-drain N-channel MOSFETs sinking to V− (not GND), eliminating need for separate ground pins while enabling level translation between bipolar and single-ended domains. Propagation delay is 12µs (typical, 10mV overdrive) with 100pF load and 1MΩ pullup.

Key Specifications

Pinout & Package

MAX983CUA is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), pin-compatible with industry-standard SO and DIP footprints. The package features exposed paddle for thermal enhancement and is rated for 0°C to +70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX982CUA, MAX983CUA offers identical performance and drop-in compatibility; versus TLV3702IDR, it reduces bill-of-materials and design effort by integrating reference and hysteresis control, albeit at slightly higher quiescent current.

Availability

MAX983CUA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and level translators requiring stable component supply with guaranteed 0°C to +70°C operation and µMAX footprint compatibility.

Supply support for MAX983CUA 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 systems.

The MAX98x series targets ultra-low-power comparator applications demanding integrated references, programmable hysteresis, and flexible supply operation - optimized for energy-constrained sensing and monitoring functions.

FAQ

What is the reference voltage accuracy of the MAX983CUA over its operating temperature range?

The MAX983CUA features an internal 1.182V bandgap reference with ±2% accuracy over the 0°C to +70°C commercial temperature range. This tolerance is specified across the full operating supply range (2.5V–11V) and applies to both reference output voltage and hysteresis programming calculations. The reference is referenced to V−, not GND, and must not be externally bypassed to maintain specified accuracy and noise performance.

Can the MAX983CUA operate from a single 3.3V supply, and what are the implications for output drive capability?

Yes, the MAX983CUA operates from a single 3.3V supply (within its 2.5V–11V range). At 3.3V, output low voltage is typically V− + 0.4V (i.e., 0.4V above V−, which is GND in single-supply mode), and sink current capability is reduced compared to 5V operation. Propagation delay increases to ~15µs (10mV overdrive), and reference load regulation remains within specification up to 25µA source/15µA sink. These characteristics are confirmed in the 3V Operation Electrical Characteristics table.

How is hysteresis implemented on the MAX983CUA, and what is the maximum adjustable hysteresis band?

Hysteresis on the MAX983CUA is implemented using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band (VHB) equals approximately twice the voltage difference between REF and HYST. Since HYST accepts (REF − 50mV) to REF, the maximum VHB is ~100mV. This method avoids external feedback loops and preserves the device's ultra-low power consumption, as confirmed in the Applications Information section.

What is the absolute maximum output voltage rating for the MAX983CUA, and how does it support level translation?

The MAX983CUA outputs are rated for 0V to 11V relative to V−, regardless of supply voltage - meaning they can safely sink loads referenced to voltages higher than V+ (e.g., 12V logic) or negative supplies. This enables robust level translation, such as converting ±5V analog signals to 3.3V digital logic, without risk of damage. The output transistor's separate V− connection (not GND) ensures correct biasing in dual-supply configurations, as detailed in the Absolute Maximum Ratings table.

Does the MAX983CUA require external bypass capacitors, and what are the recommendations for PCB layout?

The MAX983CUA does not require power-supply bypass capacitors if supply impedance is low; however, a 100nF ceramic capacitor is recommended when supply leads are long or source impedance is high. Critical layout practices include minimizing trace lengths between REF and HYST pins to avoid noise coupling, avoiding routing sensitive inputs (IN+, IN−) near noisy outputs, and never bypassing the REF pin - doing so degrades reference accuracy and increases noise, as explicitly warned in the Noise Considerations section.