Analog Devices Inc./Maxim Integrated MAX984CSE+TG126

Overview

MAX984CSE+TG126 from Maxim Integrated is a quad ultra-low-power open-drain comparator with internal 1.182V ±2% voltage reference, 4µA max supply current at +25°C, 12µs propagation delay (10mV overdrive), and dual-supply operation from ±1.25V to ±5.5V or single-supply from 2.5V to 11V. It serves as a precision threshold detector in battery-powered sensor interfaces and power-good monitoring circuits.

For engineers reviewing the MAX984CSE+TG126 datasheet, MAX984CSE+TG126 pinout, MAX984CSE+TG126 application, or MAX984CSE+TG126 equivalent, key selection criteria include guaranteed input common-mode range to V+ − 1.3V, separate GND pin for output transistors enabling bipolar-to-single-ended level translation, and absence of internal hysteresis requiring external configuration for noise-immune detection.

Technical Context

The MAX984CSE+TG126 integrates four independent comparators sharing a single internal bandgap reference referenced to V−, not GND. Each comparator features rail-to-rail input capability down to the negative supply and open-drain outputs sinking to GND - enabled by dedicated GND and V− pins that support true dual-supply operation.

Unlike MAX981–MAX983 variants, the MAX984 lacks an internal HYST pin; hysteresis must be implemented externally via positive feedback. Its 16-pin narrow SO package accommodates full quad functionality while maintaining micropower operation across −40°C to +85°C industrial temperature range when ordered as MAX984ESE.

Key Specifications

Pinout & Package

MAX984CSE+TG126 is housed in a 16-pin narrow SOIC (SOICN) package with 0.150" body width and standard 1.27mm pitch. Pin 1 is marked with a beveled corner; pin numbering follows standard SOIC convention counterclockwise from the index mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX974CSE, MAX984CSE+TG126 trades reference accuracy and hysteresis integration for lower unit cost and identical pinout compatibility; versus LM339DR, it delivers 500× lower quiescent current and built-in level-shifting architecture essential for low-power mixed-supply systems.

Availability

MAX984CSE+TG126 is available at Aetrix Electronics and suitable for battery-powered sensor nodes, industrial power sequencers, portable medical devices, and automotive body-control modules requiring stable component supply with guaranteed long-term availability.

Supply support for MAX984CSE+TG126 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 management, sensing, and connectivity in demanding industrial and automotive environments.

The MAX984CSE+TG126 belongs to Maxim's ultra-low-power comparator family targeting energy-constrained applications such as wearable health monitors and remote environmental sensors where µA-level supply current and rail-to-rail input operation are mandatory.

FAQ

What is the reference voltage tolerance of MAX984CSE+TG126 over temperature?

The MAX984CSE+TG126 features a 1.182V internal bandgap reference with ±2% accuracy over the 0°C to +70°C commercial temperature range. At extended temperatures (−40°C to +85°C), the tolerance widens to ±3%, as specified in the MAX984ESE variant datasheet. This reference is referenced to V−, not GND, so its absolute voltage at system ground depends on the V− potential.

Does MAX984CSE+TG126 support dual-supply operation with separate positive and negative rails?

Yes, MAX984CSE+TG126 supports true dual-supply operation from ±1.25V to ±5.5V. Its dedicated GND pin isolates the output-stage ground from the V− supply, allowing the comparators to operate with V+ = +5V and V− = −5V while sinking outputs to system ground - a key enabler for bipolar-to-single-ended signal conversion.

Can MAX984CSE+TG126 be used without connecting the REF pin?

No - the REF pin must be connected, either to external circuitry or left floating only if unused. While the internal reference remains active, leaving REF unconnected risks instability and increased noise coupling. If the reference is not needed, tie REF to a bypass capacitor (e.g., 100nF) to V− to maintain low-impedance AC ground and suppress reference noise.

What is the maximum sink current capability of each output in MAX984CSE+TG126?

Each open-drain output of MAX984CSE+TG126 can sink up to 50mA when V+ = 5V and VOUT = 0.4V, as characterized in the Electrical Characteristics table. At lower supply voltages (e.g., 3V), sink current decreases proportionally - approximately 18mA at V+ = 3V - due to reduced gate drive for the output N-channel MOSFET.

How does the absence of an internal HYST pin affect hysteresis implementation in MAX984CSE+TG126?

MAX984CSE+TG126 lacks an internal HYST pin, requiring external positive-feedback resistors to implement hysteresis. This adds two resistors per comparator but provides full design control over hysteresis width and threshold symmetry. Unlike HYST-pin devices, hysteresis must be calculated per channel using standard comparator feedback equations and verified under worst-case input leakage conditions.