Analog Devices Inc./Maxim Integrated MAX967ESA+

Overview

The MAX967ESA+ from Maxim Integrated is a dual micropower comparator with rail-to-rail inputs/outputs, 1.235V ±1.5% internal reference, programmable hysteresis, and open-drain outputs capable of swinging beyond VCC to 6V. It operates from +1.6V to +5.5V single supply, draws ≤16µA total (8µA per comparator), and targets ultra-low-voltage 2-cell battery systems requiring precise threshold detection with noise immunity.

For engineers reviewing the MAX967ESA+ datasheet, MAX967ESA+ pinout, MAX967ESA+ application, or MAX967ESA+ equivalent, key selection criteria include its dual-comparator architecture with shared hysteresis control, internal reference accuracy over -40°C to +85°C, SO-8 package compatibility, and suitability for voltage monitoring and window-comparator topologies in portable electronics.

Technical Context

The MAX967ESA+ implements two independent comparators sharing a common HYST input and REF output, enabling synchronized hysteresis programming across both channels. Its rail-to-rail input common-mode range (-0.25V to VCC – 0.25V) and open-drain outputs support multivoltage level translation without external biasing.

Internal 1.235V bandgap reference provides ±1.5% accuracy over 0°C to +85°C and ±2.5% over -40°C to +85°C, sourcing up to 50µA. Propagation delay is 10µs at 50mV overdrive, with input offset voltage ≤6.0mV across full temperature range in SO package.

Key Specifications

Pinout & Package

MAX967ESA+ is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, RoHS-compliant, and rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX967ESA+, MAX967EUA-T offers identical functionality in a smaller package but demands layout changes, while TLV3702IDR reduces supply current dramatically but sacrifices integrated reference and hysteresis control-making it unsuitable for drop-in replacement in reference-dependent designs.

Availability

MAX967ESA+ is available at Aetrix Electronics and suitable for battery voltage monitoring, window comparator circuits, ground-sensing systems, and voltage-level translation requiring stable component supply across industrial, medical, and consumer portable electronics programs.

Supply support for MAX967ESA+ 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 harsh and space-constrained environments.

The MAX965–MAX970 family was engineered specifically for ultra-low-voltage, micropower comparator applications in battery-powered portable systems where rail-to-rail operation, internal reference stability, and programmable hysteresis are critical.

FAQ

What is the maximum supply voltage the MAX967ESA+ can tolerate?

The MAX967ESA+ has an absolute maximum supply voltage (VCC) rating of +6V. However, its specified operational range is +1.6V to +5.5V. Operating above +5.5V voids guaranteed performance and risks permanent damage. The device's open-drain outputs can be pulled up to +6V regardless of VCC, enabling safe interfacing with higher-voltage logic domains while powered from lower supplies.

Does the MAX967ESA+ require external hysteresis components to function?

No. The MAX967ESA+ includes internal hysteresis and functions correctly with HYST pin tied to REF. External resistors (R1, R2) are optional and only needed to increase hysteresis beyond the default ±1mV - up to ±50mV - for enhanced noise immunity in electrically noisy environments. Default operation requires no external components beyond pull-up resistors on OUTA/OUTB.

Can the MAX967ESA+ operate from a 1.5V supply?

The MAX967ESA+ is specified to operate down to +1.6V. At 1.5V, the internal reference ceases to regulate (drops below 1.235V), comparator propagation delay increases significantly, and output sink capability degrades. While the comparators may still switch, performance is not guaranteed. For reliable operation, maintain VCC ≥ +1.6V - e.g., use fresh 2-cell alkaline (3.2V) or regulated 1.8V supplies.

How does the HYST pin work across both comparators in the MAX967ESA+?

In the MAX967ESA+, the HYST pin applies identical hysteresis programming to both Comparator A and Comparator B. When external resistors set a voltage at HYST, the resulting hysteresis band (VHB ≈ 2 × |VHYST − VREF|) is simultaneously applied to both comparator inputs. This ensures matched trip-point separation for coordinated dual-threshold detection, such as in window-comparator configurations where symmetry between upper and lower limits is essential.

What is the purpose of the N.C. pin (Pin 3) on the MAX967ESA+?

Pin 3 of the MAX967ESA+ is designated N.C. (No Connection) and is not bonded internally. It must remain unconnected - no trace, pad, or thermal relief should be attached. Leaving it floating avoids unintended coupling or parasitic paths. This pin exists solely for package compatibility with related devices (e.g., MAX965/MAX966) and carries no electrical function in the MAX967ESA+.