Analog Devices Inc./Maxim Integrated MAX942CSA-T

Overview

MAX942CSA-T from Maxim Integrated is a dual high-speed comparator optimized for 3V/5V single-supply systems, featuring rail-to-rail inputs, 80ns propagation delay (5mV overdrive), 350μA per comparator supply current, and CMOS/TTL-compatible push-pull outputs. It operates from 2.7V to 5.5V and is used in battery-powered threshold detection and line receiver circuits.

For engineers reviewing the MAX942CSA-T datasheet, MAX942CSA-T pinout, MAX942CSA-T application, or MAX942CSA-T equivalent, key selection considerations include input common-mode range extending beyond rails, internal hysteresis for noise immunity, output swing within 0.4V of V+ and GND, and μMAX/SO-8 package compatibility with space-constrained designs.

Technical Context

The MAX942CSA-T implements a bipolar-input, current-driven output stage enabling fast transitions without external pull-ups. Its internal hysteresis eliminates need for external feedback resistors and ensures clean switching with slow-moving or noisy inputs.

It supports rail-to-rail input operation down to 2.7V supply, with input common-mode voltage ranging from –0.2V to (V+ + 0.2V), and delivers output high/low voltages of V+ – 0.2V and 0.2V respectively at 400μA load - directly interfacing with both CMOS and TTL logic families.

Key Specifications

Pinout & Package

MAX942CSA-T is housed in an 8-pin SO (Small Outline) package with exposed pad (SO-8), footprint compatible with industry-standard S8-2 land pattern (90-0096). Pin 1 is marked by notch or dot; device orientation follows JEDEC MS-012 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and TLV3502IDR, MAX942CSA-T uniquely balances 80ns speed, 350μA/channel efficiency, built-in hysteresis, and rail-to-rail push-pull outputs - making it optimal for battery-operated, noise-prone, medium-speed analog decision circuits where layout simplicity and power efficiency are critical.

Availability

MAX942CSA-T is available at Aetrix Electronics and suitable for battery-powered systems, 3V/5V industrial interfaces, and precision threshold detection requiring stable component supply across extended temperature ranges (0°C to +70°C).

Supply support for MAX942CSA-T 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, communications, and consumer applications.

The MAX94x family was designed specifically for low-voltage, high-speed comparator applications in portable and energy-conscious systems - emphasizing rail-to-rail operation, internal hysteresis, and minimal supply current without sacrificing speed.

FAQ

What is the operating temperature range for MAX942CSA-T?

The MAX942CSA-T is rated for 0°C to +70°C ambient operation, as indicated by the 'C' suffix in its ordering code. This commercial-grade temperature range suits indoor consumer electronics, test equipment, and non-automotive industrial controls where thermal extremes are not encountered. The device's electrical characteristics - including propagation delay, offset voltage, and supply current - are guaranteed across this full range.

Does MAX942CSA-T include internal hysteresis, and how does it affect performance?

Yes, MAX942CSA-T features fixed internal hysteresis (~3mV input-referred), eliminating the need for external positive feedback resistors. This hysteresis creates distinct upper and lower trip points, preventing output oscillation when input signals transition slowly or contain noise near the threshold. As a result, MAX942CSA-T delivers clean, chatter-free switching in applications like zero-crossing detection and noisy sensor interfaces without additional components or design complexity.

Can MAX942CSA-T drive TTL logic directly, and what output current capability does it provide?

Yes, MAX942CSA-T can drive TTL logic directly due to its push-pull CMOS/TTL-compatible outputs. At 400μA sink or source current, it guarantees V_OH ≥ V+ – 0.2V and V_OL ≤ 0.2V - meeting TTL VIH/VIL thresholds across its 2.7V–5.5V supply range. For heavier loads, the output maintains rail-to-rail swing up to 4mA, though VOL rises to 0.4V and VOH drops to V+ – 0.3V at that level. No external pull-up resistors are required.

How does the rail-to-rail input capability of MAX942CSA-T benefit system design?

The rail-to-rail input range of MAX942CSA-T extends from –0.2V to V+ + 0.2V, allowing direct connection to sensors, transducers, or signal sources that operate outside the supply rails - such as transformer-coupled AC signals or current-sense amplifiers with negative common-mode offsets. This eliminates level-shifting circuitry, reduces component count, improves accuracy by avoiding resistor-divider errors, and enhances noise immunity through simplified signal paths.

Is MAX942CSA-T pin-compatible with other packages in the MAX942 family, such as the μMAX version?

No, MAX942CSA-T (SO-8) is not pin-compatible with MAX942EUA-T (μMAX-8), despite identical pin functions. While both have eight pins with matching signal assignments (V+, OUTB, INB–, INB+, GND, INA+, INA–, OUTA), the μMAX package uses a different physical layout, smaller pitch (0.5mm vs. 1.27mm), and exposed thermal pad - requiring distinct PCB footprints and assembly processes. Interchangeability demands full board redesign; SO-8 and μMAX-8 are functionally equivalent but mechanically incompatible.