Analog Devices Inc./Maxim Integrated MAX942CSA+T

Overview

The 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, line reception, and zero-crossing circuits where low power and fast response are critical.

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 compatibility with both 3V and 5V logic families without external pullups.

Technical Context

The MAX942CSA+T implements a bipolar process-based comparator core with rail-to-rail input stage enabling operation with inputs up to 0.3V beyond either supply rail. Its internal hysteresis (1mV typical input-referred width) eliminates need for external feedback resistors and ensures clean switching with slow-moving or noisy signals.

Each comparator features a current-driven output stage delivering VOH ≥ V+ − 0.4V at 400μA source and VOL ≤ 0.4V at 400μA sink, supporting direct interface to CMOS and TTL loads. Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns - critical for matched timing in dual-channel applications like differential line receivers.

Key Specifications

Pinout & Package

MAX942CSA+T is housed in an 8-pin SO (Small Outline) package, 150mil width, RoHS-compliant, with standard JEDEC MS-012AC outline and thermal pad not required.

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, the MAX942CSA+T uniquely balances 80ns speed, 350μA/channel ultra-low power, rail-to-rail inputs, and push-pull outputs - making it optimal for dual-channel 3V/5V portable and industrial sensing where efficiency and interface simplicity are co-priorities.

Availability

MAX942CSA+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial line receivers, and precision threshold detection requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°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 MAX942CSA+T belongs to Maxim's high-speed comparator family designed specifically for low-voltage, low-power, rail-to-rail operation in portable and embedded systems - emphasizing speed/power trade-off optimization without sacrificing input flexibility or output drive.

FAQ

What is the maximum supply voltage rating for the MAX942CSA+T?

The MAX942CSA+T has an absolute maximum supply voltage (V+ to GND) of +6.5V. However, its specified operating range is 2.7V to 5.5V. Operation above 5.5V voids parametric guarantees and risks permanent damage. The device is optimized for stable performance at 3V and 5V nominal supplies, with tested functionality down to 2.7V for brownout resilience. Always observe derating curves for continuous power dissipation at elevated temperatures.

Does the MAX942CSA+T support rail-to-rail input operation, and what does that mean in practice?

Yes, the MAX942CSA+T supports rail-to-rail input operation with a common-mode range of –0.2V to V+ + 0.2V. In practice, this means either input (INA+, INA−, INB+, INB−) can be driven 0.2V below GND or 0.2V above V+ without damage or output inversion - enabling direct interface with transducers, DACs, or AC-coupled signals that swing beyond the supply rails. This eliminates level-shifting circuitry in many sensor front-end designs.

Can the MAX942CSA+T drive TTL logic directly, and what output characteristics enable this?

Yes, the MAX942CSA+T drives TTL logic directly. Its push-pull outputs deliver VOH ≥ V+ − 0.4V (e.g., ≥2.6V at V+ = 3.0V) and VOL ≤ 0.4V at 400μA sink/source - meeting TTL VIH(min) = 2.0V and VIL(max) = 0.8V requirements across temperature and supply. No external pullup resistors are needed, simplifying layout and reducing component count compared to open-collector comparators like the LM393.

How does the internal hysteresis of the MAX942CSA+T improve system reliability?

The MAX942CSA+T integrates 1mV typical input-referred hysteresis, creating distinct upper and lower trip points to prevent output oscillation during slow or noisy input transitions near the threshold. This eliminates the need for external positive-feedback resistors and associated calculations, reducing design time and board area. It ensures clean, chatter-free switching in applications like zero-crossing detection or threshold alarms where input signals may have significant noise or slew limitations.

What is the guaranteed propagation delay specification for the MAX942CSA+T across temperature?

The MAX942CSA+T guarantees a maximum propagation delay of 200ns over its full operating temperature range of –40°C to +85°C, measured at 5mV overdrive into a 15pF load. At +25°C, typical delay is 80ns. This specification ensures predictable timing behavior in production systems across environmental extremes - critical for synchronizing dual-channel functions such as differential line reception or window-comparison logic where inter-channel skew must remain ≤10ns.