Analog Devices Inc./Maxim Integrated MAX924CPE+

Overview

MAX924CPE+ from Maxim Integrated is a quad micropower comparator with integrated 1.182V ±1% bandgap reference, operating from +2.5V to +11V single supply or ±1.25V to ±5.5V dual supply. It delivers 4 independent TTL/CMOS-compatible outputs, each sourcing up to 40mA continuously, with 8.5μA max supply current (C-temp), 12μs propagation delay (10mV overdrive), and rail-to-rail input range down to V− and within 1.3V of V+. It is used in battery-powered threshold detection and window comparator circuits requiring ultra-low quiescent power.

For engineers reviewing the MAX924CPE+ datasheet, MAX924CPE+ pinout, MAX924CPE+ application, or MAX924CPE+ equivalent, key selection criteria include guaranteed 4-comparator integration in 16-pin PDIP, internal reference accuracy across 0°C to +70°C, output swing referenced to GND (not V−), absence of internal hysteresis, and compatibility with single-supply 3V/5V systems without external level-shifting.

Technical Context

The MAX924CPE+ implements four independent open-collector–compatible comparators with a shared internal 1.182V reference referenced to V−, not GND. Its output stage sources up to 40mA continuously while drawing only 8.5μA typical supply current at +25°C under C-temp conditions.

Unlike MAX921/MAX923, it lacks a dedicated HYST pin and internal hysteresis; hysteresis must be implemented externally via positive feedback. Input common-mode range extends from V− to (V+ − 1.3V), supporting operation with inputs near the negative rail - critical for ground-referenced sensing in single-supply systems.

Key Specifications

Pinout & Package

MAX924CPE+ is housed in a 16-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard PCB layouts and socketing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339N and TLV331QPWR, MAX924CPE+ uniquely integrates reference and high-current sourcing in a single quad package, enabling simpler, lower-power, and more compact threshold detection - especially valuable in space-constrained, battery-operated systems where minimizing external components is critical.

Availability

MAX924CPE+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production lots.

Supply support for MAX924CPE+ 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, interface, and reliability-critical applications.

The MAX921–MAX924 family was engineered specifically for ultra-low-power, single-supply comparator applications in portable and energy-harvesting systems - prioritizing sub-10μA quiescent current, integrated reference, and robust output drive without compromising speed or accuracy.

FAQ

What is the maximum supply voltage for MAX924CPE+ in single-supply operation?

The MAX924CPE+ supports a single-supply voltage range of +2.5V to +11V. When operated with V− connected to GND, the absolute maximum rating for V+ to GND is +12V, but functional operation is guaranteed only up to +11V per the datasheet's Electrical Characteristics table. Exceeding +11V may degrade reference accuracy or increase supply current beyond specification.

Does MAX924CPE+ include internal hysteresis like MAX921 or MAX923?

No, MAX924CPE+ does not include internal hysteresis or a HYST pin. Unlike MAX921/MAX923, hysteresis must be implemented externally using positive feedback resistors on each comparator input. The datasheet provides explicit design equations and example circuits (Figure 4) for setting hysteresis bands with R1, R2, and R3 networks.

Can MAX924CPE+ operate from a 3V single supply?

Yes, MAX924CPE+ is fully specified for operation from +2.5V to +11V single supply. At +3V, it maintains 12μs propagation delay (10mV overdrive), 1.182V reference accuracy (±1%), and 40mA output sourcing capability. Supply current increases slightly to ~6.2μA typical at +3V, remaining well within ultra-low-power design goals.

How is the internal reference of MAX924CPE+ connected and used?

The internal 1.182V reference (pin 8, REF) is referenced to V− (pin 9), not GND. To use it as a threshold, tie V− to system GND in single-supply mode, then connect REF to resistor dividers feeding comparator inputs. The reference can source up to 25μA and sink 15μA at +25°C, sufficient to drive multiple high-impedance divider networks without significant droop.

What is the input common-mode voltage range for MAX924CPE+?

The input common-mode voltage range for MAX924CPE+ is specified from V− to (V+ − 1.3V). With V− = GND and V+ = +5V, this means inputs can swing from 0V to +3.7V. This rail-to-rail−1.3V range allows direct interfacing with ground-referenced sensors and ensures valid operation even when input signals approach the negative supply rail.