Analog Devices Inc./Maxim Integrated MAX922CSA

Overview

The MAX922CSA from Maxim Integrated is a dual micropower comparator with no internal voltage reference and no internal hysteresis, housed in an 8-pin SO package. It operates from a single +2.5V to +11V supply (or ±1.25V to ±5.5V dual supply), draws ≤4μA quiescent current over temperature, supports rail-to-rail input common-mode range down to V−, and delivers TTL/CMOS-compatible outputs capable of sourcing up to 40mA - ideal for low-power threshold detection in battery-powered sensor interfaces.

For engineers reviewing the MAX922CSA datasheet, MAX922CSA pinout, MAX922CSA application, or MAX922CSA equivalent, key selection criteria include its dual-comparator architecture without integrated reference, output swing from V+ to V− (requiring V− connection to GND for TTL compatibility), ultra-low supply current at extended temperature, and absence of HYST/REF pins - distinguishing it from MAX921/MAX923 variants.

Technical Context

The MAX922CSA implements two independent comparators with matched input offset voltage (±10mV max) and ultra-low input leakage (±0.01nA typical). Its output stage eliminates crowbar current during transitions, minimizing supply-line parasitic feedback and enabling stable operation without strict PCB layout constraints.

Unlike MAX921/MAX923, the MAX922CSA omits internal reference and hysteresis circuitry - requiring external reference and positive-feedback hysteresis networks when needed. Input common-mode range extends from V− to (V+ − 1.3V), supporting operation near ground in single-supply systems.

Key Specifications

Pinout & Package

Package: 8-pin SO (Small Outline), 150 mil width, surface-mount. Pin pitch: 1.27 mm. Thermal resistance: 5.88 mW/°C above +70°C (471 mW max at TA = +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and TLV3702IDR, the MAX922CSA uniquely combines ultra-low 4μA supply current, 40mA output sourcing, and V+–to–V− swing in an 8-pin SO - making it optimal for space-constrained, battery-powered dual-threshold detection where active drive and minimal quiescent load are critical.

Availability

MAX922CSA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply across commercial temperature range (0°C to +70°C).

Supply support for MAX922CSA 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.

The MAX921–MAX924 family was engineered specifically for ultra-low-power, single/dual-supply comparator functions in portable and energy-sensitive systems - emphasizing micropower operation, robust output drive, and simplified hysteresis implementation.

FAQ

What is the maximum supply voltage for the MAX922CSA?

The MAX922CSA supports a single-supply voltage range of +2.5V to +11V or dual-supply operation from ±1.25V to ±5.5V. Absolute maximum ratings specify V+ to V− ≤ +12V and V+ to GND ≤ +12V, but functional operation is guaranteed only within the specified ranges. Exceeding +11V on V+ risks parametric degradation or damage.

Does the MAX922CSA include an internal voltage reference?

No, the MAX922CSA does not include an internal voltage reference. Unlike the MAX921 and MAX923, it omits the REF and HYST pins entirely. Users must provide an external reference voltage to the comparator inputs - either from a precision voltage source, resistor divider, or bandgap IC - to establish threshold levels.

Can the MAX922CSA drive an LED directly?

Yes, the MAX922CSA can drive an LED directly: its output continuously sources up to 40mA at V+ = 5V, sufficient for standard indicator LEDs (typically 2–20mA). Connect the LED anode to V+, cathode to OUTA or OUTB, and ensure V− is tied to GND. No series resistor is needed if forward voltage drop and supply voltage align to limit current within spec.

What is the input common-mode voltage range of the MAX922CSA?

The MAX922CSA input common-mode voltage range is specified from V− to (V+ − 1.3V). This means inputs can swing down to the negative supply rail (e.g., 0V when V− = GND) and up to 1.3V below V+. For example, with V+ = 5V and V− = 0V, valid input range is 0V to 3.7V - enabling accurate sensing of ground-referenced signals.

How does the MAX922CSA differ from the MAX921CSA?

The MAX922CSA is a dual comparator with no internal reference or hysteresis, while the MAX921CSA is a single comparator with integrated 1.182V ±1% reference and HYST pin. MAX922CSA has eight pins configured for two comparators (OUTA/OUTB, INA±/INB±, V+/V−); MAX921CSA uses the same 8-pin SO but allocates pins to REF, HYST, and single OUT/IN±. They are not pin-compatible or functionally interchangeable.