Analog Devices Inc./Maxim Integrated MAX923CUA+

Overview

The MAX923CUA+ from Maxim Integrated is a dual, micropower, low-voltage comparator with integrated 1.182V ±1% 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 ≤4.5µA quiescent current over 0°C to +70°C, supports rail-to-rail input voltage range (V− to V+ − 1.3V), and delivers TTL/CMOS-compatible outputs capable of sourcing up to 40mA - ideal for battery-powered threshold detection in portable instrumentation.

For engineers reviewing the MAX923CUA+ datasheet, MAX923CUA+ pinout, MAX923CUA+ application, or MAX923CUA+ equivalent, key selection criteria include its dual-comparator architecture with shared internal reference, µMAX-8 package footprint, guaranteed hysteresis control without external feedback, 12µs propagation delay at 10mV overdrive, and compatibility with single-supply 3V/5V systems requiring ultra-low quiescent power and stable trip-point accuracy.

Technical Context

The MAX923CUA+ integrates two independent comparators sharing a precision 1.182V reference referenced to V−, with dedicated HYST pin enabling adjustable hysteresis using only two external resistors. Its input common-mode range extends from V− to V+ − 1.3V, supporting operation near ground in single-supply configurations while maintaining ±10mV input offset voltage and <5nA input leakage over temperature.

Unlike conventional comparators, the MAX923CUA+ employs a unique output stage that continuously sources up to 40mA without crowbar current during transitions, eliminating supply-line glitches and parasitic feedback - enabling stable operation even with suboptimal PCB layout or high-capacitive loads up to 100pF.

Key Specifications

Pinout & Package

Package: 8-pin µMAX (3mm × 3mm, 0.5mm pitch), thermally enhanced leadframe package with exposed pad - compatible with standard SO-8 reflow profiles and optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and TLV3702IDR, the MAX923CUA+ uniquely combines dual comparators, precision reference, and hysteresis control in one µMAX-8 package - reducing design complexity, component count, and PCB area while delivering verified 4.5µA operation and ±1% threshold accuracy across 0°C to +70°C.

Availability

MAX923CUA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for MAX923CUA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX92x family was designed specifically for ultra-low-power, precision threshold detection in portable and energy-sensitive applications - emphasizing micropower operation, integrated references, and robust output drive without compromising speed or accuracy.

FAQ

What is the maximum supply voltage for the MAX923CUA+ in single-supply operation?

The MAX923CUA+ supports a single-supply voltage range of +2.5V to +11V. At +11V, it maintains full specification compliance including input common-mode range (V− to V+ − 1.3V), output drive capability, and reference accuracy. Operation above +11V risks permanent damage per Absolute Maximum Ratings.

Can the MAX923CUA+ operate from a dual ±5V supply?

Yes, the MAX923CUA+ operates from dual supplies ranging from ±1.25V to ±5.5V. When using ±5V, V+ = +5V and V− = −5V, with GND connected to the system ground. The internal reference (REF) remains referenced to V−, so REF = V− + 1.182V = −3.818V, requiring level-shifting if interfacing with ground-referenced logic.

How is hysteresis programmed on the MAX923CUA+?

Hysteresis is programmed using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band (VHB) ≈ 2 × (VREF − VHYST). With VREF = 1.182V and VHYST adjustable from REF − 50mV to REF, VHB ranges from 0 to 100mV. For example, R1 = 100kΩ and R2 = 2.4MΩ yields ~50mV hysteresis.

Does the MAX923CUA+ require external bypass capacitors?

No external bypass capacitors are required for the MAX923CUA+ if the supply impedance is low. However, a 100nF ceramic capacitor placed close to V+ and GND is recommended when supply leads are long or source impedance is high. Critically, the REF pin must never be bypassed - doing so degrades reference stability and increases noise.

What is the guaranteed input offset voltage for the MAX923CUA+?

The MAX923CUA+ guarantees an input offset voltage of ±10mV over the full operating temperature range (0°C to +70°C), measured at VCM = 2.5V. This specification ensures consistent trip-point accuracy in precision threshold detection applications such as battery voltage monitoring and sensor signal conditioning.