Analog Devices Inc./Maxim Integrated MAX988EXK

Overview

MAX988EXK from Maxim Integrated is a single-channel, micropower, rail-to-rail input/output comparator with open-drain output stage, operating from +2.5V to +5.5V single supply or ±1.25V to ±2.75V dual supply. It delivers 120ns propagation delay, 48µA quiescent supply current per comparator, and supports output pull-up beyond VCC to 6V above VEE - ideal for level translation in battery-powered sensor interfaces and portable logic systems.

For engineers reviewing the MAX988EXK datasheet, MAX988EXK pinout, MAX988EXK application, or MAX988EXK equivalent, key selection criteria include open-drain output voltage tolerance (up to 6V above VEE), rail-to-rail input common-mode range extending 250mV beyond rails, internal 2.5mV hysteresis, low input bias current (1.0pA typ), and SC70-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX988EXK implements a precision analog comparator core with input stage designed to maintain stable operation across rail-to-rail common-mode voltages (–0.25V to VCC + 0.25V) and tolerate overdriven inputs without phase reversal. Its internal hysteresis band of ±2.5mV ensures clean switching on slow-moving signals.

The open-drain output stage enables bidirectional level shifting: it sinks current when active and allows external pull-up to any voltage up to 6V above VEE, supporting interoperability between 3V and 5V logic domains or bipolar-to-single-ended conversion without additional interface circuitry.

Key Specifications

Pinout & Package

MAX988EXK is housed in a 5-pin SC70-5 package (package code X5-1), measuring 2.0mm × 1.25mm × 0.9mm with 0.65mm lead pitch. This ultra-compact outline supports high-density routing in wearable and IoT edge nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3701DBVR and LMV7215M5X, the MAX988EXK uniquely combines sub-50µA supply current, 120ns speed, rail-to-rail input with 250mV rail extension, and 6V-tolerant open-drain output - making it optimal for compact, multi-voltage, battery-sensitive systems requiring precise, glitch-immune threshold detection.

Availability

MAX988EXK is available at Aetrix Electronics and suitable for portable battery-powered systems, logic-level translation interfaces, zero-crossing detection circuits, and threshold discriminators requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for MAX988EXK 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX987/MAX988 family was engineered specifically for micropower, high-speed comparator functions in space-constrained, battery-operated equipment - emphasizing rail-to-rail operation, low supply current, and robust input/output voltage handling.

FAQ

What is the maximum allowable voltage on the MAX988EXK OUT pin?

The MAX988EXK OUT pin is rated for –0.3V to +6V relative to VEE. This means when VEE = 0V (single-supply configuration), the output can be safely pulled up to +6V - enabling reliable interfacing with higher-voltage logic families or isolated signal chains without external protection components. Always verify that the external pull-up voltage does not exceed this absolute maximum rating to prevent device damage.

Does the MAX988EXK require external hysteresis for stable operation?

No, the MAX988EXK includes internal hysteresis of ±2.5mV, which prevents output chatter on slow-moving or noisy input signals - sufficient for most threshold-detection applications. External hysteresis can be added via positive feedback resistors if wider switching bands (e.g., >10mV) are needed, but it is not required for basic functionality. The internal hysteresis is factory-trimmed and remains stable across temperature.

Can the MAX988EXK operate from a 3.3V supply and drive a 5V logic input?

Yes - the MAX988EXK can be powered from 3.3V while its open-drain OUT pin is pulled up to 5V, provided the 5V rail is referenced to the same VEE (typically ground). Since the OUT pin tolerates up to +6V relative to VEE, connecting a 5V pull-up resistor enables direct 3.3V-to-5V level translation. Ensure the driven 5V input has appropriate input leakage and capacitance specifications compatible with the MAX988EXK's output drive strength.

What is the purpose of the N.C. pin on the MAX988EXK SC70-5 package?

The N.C. (No Connection) pin on the MAX988EXK is Pin 1 in the SC70-5 package and is not internally bonded. It must remain unconnected - neither tied to ground nor used for thermal relief or mechanical anchoring. Routing traces or vias to this pin may cause parasitic coupling or mechanical stress; best practice is to leave it floating and exclude from copper pours or solder mask openings to avoid unintended electrical interaction.

How does the MAX988EXK minimize supply-line glitches during output transitions?

The MAX988EXK employs a unique output-stage architecture that limits supply-current surges during switching - reducing transient current spikes by >90% compared to conventional comparators. As shown in Typical Operating Characteristics, supply current increases only marginally (to ~100µA) even at 1MHz output transition frequency. This eliminates the need for large local bypass capacitors and prevents noise coupling into adjacent analog or RF sections of the PCB.