Analog Devices Inc./Maxim Integrated MAX978EEE+

Overview

MAX978EEE+ from Maxim Integrated is a quad, high-speed, low-power comparator optimized for single-supply +3V/+5V systems. It delivers 20ns propagation delay, 225µA per comparator supply current, rail-to-rail output operation, and ground-sensing inputs (–0.2V to V_CC–1.2V common-mode range), enabling direct interface with CMOS/TTL logic in battery-powered threshold detection circuits.

For engineers reviewing the MAX978EEE+ datasheet, MAX978EEE+ pinout, MAX978EEE+ application, or MAX978EEE+ equivalent, key selection criteria include propagation delay matching (±1ns between channels), shutdown compatibility (not supported on MAX978), QSOP-16 package thermal performance (667mW at +70°C), and input offset voltage (±2mV max) in industrial temperature range (–40°C to +85°C).

Technical Context

The MAX978EEE+ implements four independent comparators in a single monolithic CMOS IC, each featuring internal hysteresis (0.5–4.0mV input-referred) to suppress noise-induced oscillation during slow input transitions. Its push-pull output stage eliminates need for external pull-up resistors and supports rail-to-rail sourcing/sinking up to ±20mA.

All inputs tolerate continuous short-circuit faults to either rail, and the common-mode input range extends 200mV below ground-critical for detecting signals near 0V in single-supply systems such as IR receivers and digital line receivers. No shutdown functionality is present, distinguishing it from the MAX998 variant.

Key Specifications

Pinout & Package

MAX978EEE+ is housed in a 16-pin QSOP package (package code E16M+1), with 0.65mm lead pitch and 5.3mm × 10.2mm body size. Thermal resistance θ_JA is 120°C/W, supporting 667mW continuous dissipation at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX978EEE+, LM339DR trades speed and integration for cost, while TLV3704IPW prioritizes quiescent current over response time - neither offers the 20ns delay + 225µA + rail-to-rail combo critical for high-fidelity digital line reception or fast battery monitoring.

Availability

MAX978EEE+ is available at Aetrix Electronics and suitable for battery-powered systems, IR receivers, digital line receivers, and 3V industrial sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX978EEE+ 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 industrial, automotive, and communications applications, with emphasis on power efficiency and signal integrity.

The MAX976/MAX978/MAX998 family was engineered specifically for high-speed, low-power single-supply comparator functions in space-constrained, battery-operated, and noise-sensitive systems - delivering 20ns speed without compromising on input range or output drive.

FAQ

What is the operating supply voltage range for MAX978EEE+?

The MAX978EEE+ operates from a single supply of +2.7V to +5.5V. This range supports both 3V and 5V system rails without external regulation. Operation below 2.7V is not guaranteed, and absolute maximum supply voltage is +6V - exceeding this risks permanent damage. The device maintains specified propagation delay and offset voltage performance across the full 2.7V–5.5V range.

Does MAX978EEE+ support shutdown mode?

No, MAX978EEE+ does not include a shutdown feature. Unlike the MAX998EUT+ (which has SHDN pin and 1nA shutdown current), the MAX978EEE+ is a fixed-function quad comparator with no enable/disable control. All four comparators remain active whenever V_CC is within specification. Power reduction must be achieved externally via supply gating or system-level sleep modes.

What is the input common-mode voltage range of MAX978EEE+?

The input common-mode voltage range of MAX978EEE+ is –0.2V to (V_CC – 1.2V). This means either input (IN+ or IN–) can be driven as low as 200mV below ground or as high as 1.2V below V_CC, while maintaining valid comparator operation. This ground-sensing capability enables direct interfacing with sensors and signals referenced to 0V - a key differentiator versus standard comparators limited to 0V–V_CC.

Can MAX978EEE+ drive TTL or CMOS logic directly?

Yes, MAX978EEE+ can drive TTL and CMOS logic directly due to its rail-to-rail push-pull outputs. At V_CC = 5V, VOH ≥ 4.6V and VOL ≤ 0.4V under 2mA load - meeting standard TTL high/low thresholds and exceeding 3.3V CMOS VIH/VIL requirements. No external pull-up resistors are needed, simplifying PCB layout and reducing component count in digital interface applications.

What package type is used for MAX978EEE+?

MAX978EEE+ uses a 16-pin QSOP (Quarter-Size Outline Package) with lead pitch of 0.65mm and body dimensions of 5.3mm × 10.2mm. The "EEE" suffix denotes RoHS-compliant, lead-free packaging. This package provides better thermal performance (667mW at +70°C) than narrower SOIC variants and is compatible with standard surface-mount assembly processes.