Analog Devices Inc./Maxim Integrated MAX987EXK+T

Overview

MAX987EXK+T from Maxim Integrated is a single-channel, micropower, rail-to-rail input/output comparator with push-pull output stage, operating from +2.5V to +5.5V supply, delivering 120ns propagation delay, 48μA quiescent current per comparator, and ±0.5mV typical input offset voltage. It is used in battery-powered zero-crossing detectors and threshold discriminators where low power and fast response are critical.

For engineers reviewing the MAX987EXK+T datasheet, MAX987EXK+T pinout, MAX987EXK+T application, or MAX987EXK+T equivalent, key selection criteria include its SC70-5 package footprint, push-pull 8mA drive capability, rail-to-rail common-mode range extending 250mV beyond rails, and guaranteed operation from –40°C to +85°C.

Technical Context

The MAX987EXK+T employs a high-speed, low-power comparator core with internal hysteresis (±2.5mV) to ensure clean switching on slow-moving inputs. Its input stage supports common-mode voltages from VEE – 0.25V to VCC + 0.25V and exhibits 1.0pA typical input bias current.

The push-pull output stage sources and sinks up to 8mA while maintaining rail-to-rail swing, with VOL ≤ 0.4V at 8mA sink (VCC = 5V) and VOH ≥ 4.6V at 8mA source (VCC = 5V). Supply-current surges during switching are minimized via proprietary output architecture, reducing supply glitches.

Key Specifications

Pinout & Package

MAX987EXK+T is housed in a 5-pin SC70-5 (X5-1) package - ultra-compact surface-mount outline measuring 2.0mm × 1.25mm × 0.9mm, optimized for space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3701IDBVR and LMV7215M5X, MAX987EXK+T uniquely delivers sub-130ns speed *and* sub-50μA quiescent current *and* integrated hysteresis *and* push-pull 8mA drive in the same SC70-5 package - making it optimal for space- and power-constrained high-speed thresholding.

Availability

MAX987EXK+T is available at Aetrix Electronics and suitable for portable/battery-powered systems, zero-crossing detectors, and threshold discriminators requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.

Supply support for MAX987EXK+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 MAX987EXK+T belongs to Maxim's high-speed micropower comparator family, engineered specifically for low-voltage, battery-operated systems demanding rail-to-rail performance, minimal supply disturbance, and compact packaging.

FAQ

What is the maximum capacitive load the MAX987EXK+T output can drive while maintaining 120ns propagation delay?

The MAX987EXK+T maintains ≤120ns propagation delay (at 100mV overdrive) with capacitive loads up to 15pF when VCC = 5V. At 50pF, delay increases to 20ns; at 200pF, it reaches 40ns. For loads >50pF, consider adding a buffer stage or selecting a comparator with higher drive strength. The MAX987EXK+T datasheet specifies these values in the Propagation Delay vs. Capacitive Load graph (TOC8).

Does the MAX987EXK+T support dual-supply operation, and what are the limits?

Yes, the MAX987EXK+T supports dual-supply operation from ±1.25V to ±2.75V (i.e., VCC – VEE ≤ 6V total). In dual mode, VEE is connected to the negative rail (e.g., –2.5V), VCC to the positive rail (e.g., +2.5V), and inputs referenced accordingly. Absolute maximum ratings specify VCC to VEE ≤ 6V and input voltage range as VEE – 0.3V to VCC + 0.3V.

Can the MAX987EXK+T be used with input signals exceeding the supply rails, and what protection exists?

Yes - the MAX987EXK+T allows input voltages up to 0.3V beyond VCC or VEE without phase reversal, thanks to internal ESD diodes. However, input bias current rises exponentially beyond the rails due to forward conduction of those diodes. For sustained overvoltage, external series resistors (e.g., 100kΩ) are recommended to limit current to <20mA, per Absolute Maximum Ratings.

Is there an internal hysteresis on the MAX987EXK+T, and how does it affect threshold stability?

Yes, the MAX987EXK+T includes ±2.5mV internal hysteresis centered on the input offset voltage. This prevents output oscillation when input signals are near the decision threshold and have noise or slow slew rates. The hysteresis band is fixed and cannot be disabled; it improves noise immunity without requiring external components - unlike many comparators needing positive-feedback networks.

What is the minimum supply voltage at which the MAX987EXK+T guarantees full rail-to-rail input common-mode range?

The MAX987EXK+T guarantees a common-mode input range of VEE – 0.25V to VCC + 0.25V across its full operating supply range (+2.5V to +5.5V). At VCC = 2.5V, this means inputs may range from –0.25V to +2.75V - enabling true rail-to-rail operation even at the lowest rated supply, critical for low-voltage sensor interfaces.