Analog Devices Inc./Maxim Integrated MAX9077EUA+T

Overview

MAX9077EUA+T from Maxim Integrated is a dual, rail-to-rail input/output, ultra-low-power comparator optimized for single-supply portable systems. It delivers 580ns propagation delay at just 3µA per comparator, operates from 2.1V to 5.5V, and features ground-sensing inputs with -0.2V to VCC–1.2V common-mode range - enabling direct battery-voltage monitoring in wearables and sensor nodes.

For engineers reviewing the MAX9077EUA+T datasheet, MAX9077EUA+T pinout, MAX9077EUA+T application, or MAX9077EUA+T equivalent, this device is selected for low-quiescent-current threshold detection where supply voltage headroom is constrained, output drive into 2mA TTL/CMOS loads is required, and rail-to-rail input swing without phase inversion must be guaranteed.

Technical Context

The MAX9077EUA+T implements a BiCMOS-based comparator core with push-pull output stage, eliminating external pull-up resistors and supporting true rail-to-rail output swing (VOL = 0.4V @ 2mA, VOH = VCC – 0.4V @ 2mA). Its input stage lacks differential clamping, permitting rail-to-rail differential input voltage while maintaining stable operation across -0.2V to VCC–1.2V common-mode range.

Propagation delay is tightly specified at 580ns (typ) with 100mV overdrive and 10pF load, and supply current remains stable across temperature (±0.5µA variation from -40°C to +85°C at VCC = 3V). Input offset voltage is ±1mV (max), and input bias current is -5nA (typ), enabling precision thresholding in high-impedance sensing circuits.

Key Specifications

Pinout & Package

The MAX9077EUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead(Pb)-free, with exposed pad for thermal enhancement and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV7235M5X/NOPB and TLV3702IDR, the MAX9077EUA+T uniquely combines ground-sensing inputs, rail-to-rail outputs, and sub-4µA operation - making it the only option among the three that supports true 0V-referenced battery monitoring while driving CMOS loads directly.

Availability

MAX9077EUA+T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors/discriminators, and keyless entry systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX9077EUA+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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, communications, and consumer applications.

The MAX9075/MAX9077 family was engineered specifically for ultra-low-power, space-constrained portable electronics - delivering high-speed comparison with minimal supply current and minimal PCB footprint.

FAQ

What is the operating supply voltage range for MAX9077EUA+T?

The MAX9077EUA+T operates from 2.1V to 5.5V, enabling direct use with single Li-ion cells (3.0–4.2V), 3V coin cells, or standard 3.3V/5V regulated supplies. This wide range eliminates the need for external regulators in portable designs and supports brown-out detection down to 2.1V while maintaining 580ns propagation delay and 3µA quiescent current per comparator.

Does MAX9077EUA+T support ground-referenced input signals?

Yes, the MAX9077EUA+T supports ground-referenced inputs via its extended common-mode input voltage range of -0.2V to VCC–1.2V. This allows direct connection of sensors or battery cathodes to INx− or INx+ pins without level-shifting circuitry. Unlike many comparators, it has no input ESD diode clamp to VCC, preventing unintended conduction when inputs fall below GND.

Can MAX9077EUA+T drive TTL or CMOS logic directly?

Yes, MAX9077EUA+T features rail-to-rail push-pull outputs capable of sourcing and sinking up to 2mA, delivering VOL ≤ 0.4V and VOH ≥ VCC–0.4V. This meets standard TTL and CMOS logic thresholds across its full 2.1V–5.5V supply range, eliminating external pull-up resistors or buffer ICs when interfacing with microcontrollers, FPGAs, or logic gates.

What is the maximum differential input voltage the MAX9077EUA+T can tolerate?

The MAX9077EUA+T has no internal differential clamp between inputs, allowing differential input voltages beyond the supply rails - for example, ±5V across IN+ and IN− while operating at VCC = 3.3V. This simplifies overvoltage protection design and enables robust operation in noisy environments where transient spikes exceed VCC or drop below GND.

Is MAX9077EUA+T pin-compatible with other dual comparators in µMAX packages?

No, MAX9077EUA+T uses a proprietary 8-pin µMAX pinout (OUTA, INA−, INA+, GND, VCC, INB+, INB−, OUTB) not shared with industry-standard dual comparators like LM393 or TLV3702. Its pin assignment is optimized for layout symmetry and noise isolation between channels - substitution requires PCB redesign unless using a dedicated adapter or footprint-compatible alternative.