Analog Devices Inc./Maxim Integrated MAX923CSA+

Overview

The MAX923CSA+ from Maxim Integrated is a dual, micropower, low-voltage comparator with internal 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 ≤6µA quiescent current over temperature, supports rail-to-rail input swing down to V− and within 1.3V of V+, and delivers TTL/CMOS-compatible outputs capable of sourcing 40mA continuously - ideal for battery-powered threshold detection in portable instrumentation.

For engineers reviewing the MAX923CSA+ datasheet, MAX923CSA+ pinout, MAX923CSA+ application, or MAX923CSA+ equivalent, key selection considerations include its dual-comparator architecture with shared reference and hysteresis control, guaranteed operation across 0°C to +70°C, SO-8 package compatibility, and absence of switching crowbar current - critical for stable low-noise sensing in space-constrained, low-power systems.

Technical Context

The MAX923CSA+ integrates two independent comparators sharing a precision 1.182V reference referenced to V−, with dedicated IN+, IN−, OUTA, OUTB, HYST, REF, V+, and V− terminals. Its unique output stage eliminates crowbar current during transitions, minimizing parasitic supply feedback and enabling stable operation without strict layout constraints.

Hysteresis is implemented externally using two resistors between REF, HYST, and V− - a method that applies identical hysteresis to both comparators and avoids external feedback loops. Input common-mode range extends from V− to (V+ − 1.3V), supporting wide dynamic signal monitoring in single- or dual-supply configurations.

Key Specifications

Pinout & Package

MAX923CSA+ uses an 8-pin SO (Small Outline) package, 150 mil width, with standard JEDEC MS-012AC footprint. Pin 1 is marked by notch or dot; pin numbering is counterclockwise from top-left corner when viewed from top with marking side up.

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 MAX923CSA+ uniquely combines dual comparators, precision reference, and hysteresis control in one SO-8 package - delivering lowest system-level component count and longest battery runtime for 3V–5V threshold-detection applications.

Availability

MAX923CSA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply with commercial temperature grade (0°C to +70°C) and SO-8 packaging.

Supply support for MAX923CSA+ 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 consumer systems.

The MAX921–MAX924 family was engineered specifically for ultra-low-power, single-supply sensing - prioritizing micropower operation (<6µA), integrated reference accuracy, and robust output drive in minimal 8-pin packages.

FAQ

What is the maximum supply voltage for MAX923CSA+ in single-supply operation?

The MAX923CSA+ supports a single-supply voltage range of +2.5V to +11V. At +11V, it maintains full functionality including reference regulation, comparator accuracy, and 40mA output sourcing. Operation above +11V risks permanent damage per absolute maximum ratings. For dual-supply use, total voltage (V+ − V−) must not exceed +11V, with individual rails limited to ±5.5V.

Does MAX923CSA+ require external hysteresis components?

MAX923CSA+ does not require external hysteresis components to implement hysteresis - it provides a dedicated HYST pin enabling simple two-resistor configuration (REF → HYST → V−) to set hysteresis band up to 100mV. If no hysteresis is needed, connect HYST directly to REF. External positive-feedback hysteresis is unnecessary and not recommended for this device.

Can MAX923CSA+ operate from a 3.3V supply?

Yes, MAX923CSA+ is fully specified and functional at +3.3V single supply. Electrical characteristics including 6µA max supply current, 12µs propagation delay, and 1.182V reference accuracy are guaranteed across +2.5V to +11V. Input common-mode range extends from GND to +2.0V, and outputs swing rail-to-rail - making it ideal for 3.3V microcontroller interface applications.

What is the purpose of the V− pin on MAX923CSA+?

The V− pin on MAX923CSA+ serves as the negative supply rail and reference point for the internal 1.182V bandgap reference. In single-supply operation, V− is connected to GND; the reference voltage is then 1.182V above GND. In dual-supply mode, V− is connected to a negative rail (e.g., −5V), and the reference remains 1.182V above that rail - ensuring consistent threshold referencing regardless of supply configuration.

Is MAX923CSA+ pin-compatible with other MAX92x devices in SO-8 package?

MAX923CSA+ is pin-compatible with MAX921CSA+ and MAX922CSA+ in the SO-8 package for shared pins (V+, REF, HYST, IN+, IN−, V−, GND, OUT), but differs in pin 8 function: MAX923CSA+ uses pin 8 as OUTA, while MAX921CSA+ uses it as OUT and MAX922CSA+ as OUTB. Pin 4 is INB− on MAX923CSA+, but IN− on MAX921CSA+ and INB+ on MAX922CSA+. Direct substitution requires schematic verification.