Analog Devices Inc./Maxim Integrated MAX902EPD

Overview

MAX902EPD from Maxim Integrated is a quad high-speed, low-power voltage comparator with differential analog inputs and TTL-compatible outputs featuring independent latch inputs per channel. It delivers 8ns typical propagation delay at 5mV overdrive, consumes 18mW per comparator at +5V, supports ±5V or +5V/+10V analog supplies with negative-rail input sensing, and operates across –40°C to +85°C. It is used in high-speed A/D converters, line receivers, and PWM circuits.

For engineers reviewing the MAX902EPD datasheet, MAX902EPD pinout, MAX902EPD application, or MAX902EPD equivalent, key selection criteria include latch-enabled output hold capability, dual-supply isolation (analog VCC/VEE + digital VDD), rail-to-rail common-mode input range including VEE, TTL output drive strength (8mA sink), and temperature-stable timing performance up to +85°C.

Technical Context

The MAX902EPD implements four independent comparators sharing separate analog (VCC/VEE) and digital (VDD) supply domains, enabling noise-isolated mixed-signal operation. Each channel features TTL-compatible latch inputs that freeze output states on logic-low assertion - a function absent in MAX901 but present in MAX900/MAX902/MAX903.

Its input stage accepts common-mode voltages from VEE − 0.1V to VCC − 2.25V, allowing ground-sensing operation when VEE = GND. Propagation delay (tpd+ / tpd−) is guaranteed ≤15ns over full temperature range with 5mV overdrive and 15pF load, and output skew (∆tpd) between channels is limited to 3ns max.

Key Specifications

Pinout & Package

MAX902EPD is supplied in a 14-pin plastic DIP package (0.300" wide) with through-hole mounting and industry-standard pin spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX902EPD, MAX9202 offers identical pinout and speed with significantly reduced power and enhanced supply rejection, while LM339MTX/NOPB trades speed and latching for broad supply compatibility and cost efficiency - making it unsuitable for high-speed sampling but viable for basic threshold alerts.

Availability

MAX902EPD is available at Aetrix Electronics and suitable for industrial control systems, test equipment signal conditioning, and legacy embedded instrumentation requiring stable component supply with extended temperature support.

Supply support for MAX902EPD 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.

The MAX900–MAX903 family was designed to deliver nanosecond-speed voltage discrimination with latch control and supply-domain isolation for real-time data acquisition and signal integrity-critical systems.

FAQ

What is the maximum operating temperature range for the MAX902EPD?

The MAX902EPD is rated for operation from –40°C to +85°C, as confirmed by its ordering code suffix "E" and the Absolute Maximum Ratings table in the official datasheet. This extended temperature grade makes it suitable for industrial environments where ambient conditions exceed commercial-grade limits. The MAX902EPD maintains specified propagation delay (≤15ns) and input offset voltage (<3mV) across this full range, ensuring consistent timing and accuracy in field-deployed systems.

Does the MAX902EPD support single-supply operation?

Yes, the MAX902EPD supports true single-supply operation with VEE tied to ground and VCC set between +5V and +10V. Its input common-mode range extends down to VEE − 0.1V, enabling ground-referenced signal sensing. The digital supply VDD remains fixed at +5V. This configuration is explicitly validated in Figure 1A of the datasheet and allows simplified power design in systems lacking negative rails - a key advantage over comparators requiring dual supplies.

How many independent latch inputs does the MAX902EPD provide?

The MAX902EPD provides four independent TTL-compatible latch inputs - one per comparator channel (LATCH A through LATCH D). Pins 4, 11, and 14 (and internally pin 13 per functional block diagram) correspond to these inputs, allowing selective hold control of individual outputs. This differs from the MAX901, which lacks latch inputs entirely, and enables flexible asynchronous sampling strategies not possible with globally latched devices.

What is the recommended decoupling strategy for the MAX902EPD?

The MAX902EPD requires separate 100nF ceramic decoupling capacitors placed as close as possible to each supply pin: one between VCC and VEE, one between VDD and GND, and an additional 100nF cap between VCC and GND if shared ground is used. This is mandated in the "Circuit Layout" section of the datasheet to suppress high-frequency noise coupling into the analog input path. Failure to implement separate analog/digital decoupling risks oscillation and degraded propagation delay stability, especially above 50MHz.

Is the MAX902EPD pin-compatible with newer Maxim comparators?

Yes - the MAX9202 is explicitly documented as a pin-for-pin replacement for the MAX902EPD, offering identical pinout, speed (8ns typ), and latch functionality while reducing power consumption by 50%. This compatibility is stated in the "For newer, pin-for-pin compatible parts…" note on page 1 of the MAX900–MAX903 datasheet. No PCB changes are required when migrating from MAX902EPD to MAX9202, making it the recommended upgrade path for new designs.