Analog Devices Inc./Maxim Integrated MAX922EPA

Overview

The MAX922EPA from Maxim Integrated is a dual micropower comparator with TTL/CMOS-compatible outputs, operating from a single +2.5V to +11V supply or dual ±1.25V to ±5.5V supplies. It draws ≤4μA quiescent current over –40°C to +85°C, features rail-to-rail input voltage range (V– to V+ – 1.3V), and delivers 40mA continuous output source current - ideal for battery-powered threshold detection in portable instrumentation and low-power sensor interfaces.

For engineers reviewing the MAX922EPA datasheet, MAX922EPA pinout, MAX922EPA application, or MAX922EPA equivalent, key selection criteria include its dual-comparator architecture without internal reference or hysteresis, 12μs propagation delay at 10mV overdrive, output swing from V+ to V–, and compatibility with single- or dual-supply systems requiring ultra-low quiescent current and robust noise immunity.

Technical Context

The MAX922EPA implements two independent comparators with no internal voltage reference or programmable hysteresis - unlike MAX921/MAX923. Its input common-mode range extends from V– to (V+ – 1.3V), supporting operation near the negative rail, and its output stage continuously sources up to 40mA while sinking >5mA, eliminating crowbar current during transitions.

This architecture avoids parasitic feedback and enables stable operation without bypass capacitors on REF (which is absent). The device supports both single-supply (V– = GND) and dual-supply (e.g., ±5V) configurations, with output logic levels referenced to V–, ensuring TTL compatibility when V– = GND and V+ = +5V.

Key Specifications

Pinout & Package

MAX922EPA uses an 8-pin plastic DIP package (0.300" wide), with pin 1 designated as OUTB, pin 2 as V+, pin 3 as INB+, pin 4 as INB–, pin 5 as INA–, pin 6 as INA+, pin 7 as V–, and pin 8 as OUTA. All pins are electrically validated per Maxim's official datasheet revision 7 (1/20).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and TLV3702IDR, the MAX922EPA uniquely combines 4μA quiescent current, 40mA sourcing, and crowbar-free switching - making it irreplaceable in battery-powered systems requiring direct drive of moderate loads with minimal supply disturbance.

Availability

MAX922EPA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply across industrial temperature ranges.

Supply support for MAX922EPA 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 MAX921–MAX924 family was engineered specifically for ultra-low-power comparator functions in space-constrained, battery-operated equipment - emphasizing micropower operation, rail-to-rail inputs, and robust output drive without compromising stability.

FAQ

What is the maximum operating temperature range for the MAX922EPA?

The MAX922EPA is rated for operation from –40°C to +85°C, as confirmed by Maxim's official ordering information table and electrical characteristics testing conditions. This extended temperature range makes it suitable for industrial and automotive under-hood applications where ambient temperatures exceed commercial-grade limits. The MAX922EPA maintains ≤4μA quiescent current across this full range.

Does the MAX922EPA include an internal voltage reference?

No, the MAX922EPA does not include an internal voltage reference. Unlike the MAX921 and MAX923, the MAX922EPA is a dual comparator-only device with no REF pin or built-in 1.182V bandgap reference. External reference sources must be used for precise threshold setting. This design choice reduces die area and cost while maximizing flexibility for system-level reference selection.

Can the MAX922EPA operate from a single 3V supply?

Yes, the MAX922EPA operates from a single +2.5V to +11V supply, including +3V. With V– connected to GND and V+ = 3V, its input common-mode range spans 0V to 1.7V, and output swings from 3V to 0V. Propagation delay increases slightly (to ~14μs at 10mV overdrive), and output drive capability reduces proportionally - verified in the "3V OPERATION" section of the datasheet.

What is the purpose of the HYST pin on the MAX922EPA?

The MAX922EPA does not have a HYST pin. That pin is present only on the MAX921 and MAX923 (which feature internal hysteresis control). The MAX922EPA relies on external positive-feedback networks for hysteresis implementation, as detailed in Figure 4 of the datasheet. Attempting to connect a HYST signal to MAX922EPA will result in undefined behavior since pin 6 is INA+ and pin 5 is INA– - neither is designated for hysteresis control.

How does the MAX922EPA eliminate power-supply glitches during output transitions?

The MAX922EPA eliminates power-supply glitches by using a unique output stage that avoids crowbar current - the simultaneous conduction of high-side and low-side transistors during logic transitions. This design prevents momentary short-circuits between V+ and V–, minimizing parasitic supply-line feedback and ensuring stable operation even with minimal or no power-supply bypassing, as confirmed in the "Detailed Description" section.