Analog Devices Inc./Maxim Integrated MAX903CPA

Overview

MAX903CPA from Maxim Integrated is a quad high-speed, low-power voltage comparator with differential analog inputs and TTL-logic outputs featuring active internal pull-ups. It delivers 8ns typical propagation delay at 5mV overdrive, consumes 18mW per comparator at +5V, supports separate analog/digital supplies (VCC/VEE and VDD), and includes independent TTL-compatible latch inputs for output hold functionality - ideal for high-speed A/D converters, line receivers, and PWM circuits.

For engineers reviewing the MAX903CPA datasheet, MAX903CPA pinout, MAX903CPA application, or MAX903CPA equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the MAX903CPA in 8-pin Plastic DIP packaging.

Technical Context

The MAX903CPA implements four independent high-gain comparators with rail-to-rail input common-mode range extending to the negative supply rail (VEE), enabling ground-sensing operation on single +5V supply (VEE = GND). Each channel features TTL-compatible latch inputs that freeze output states when driven low - a function absent in MAX901 but present and fully specified for MAX903.

It operates with flexible supply configurations: analog supplies VCC (+5V to +10V) and VEE (–5V or GND), plus dedicated digital supply VDD (+5V only). Propagation delay is guaranteed ≤15ns over full temperature range (0°C to +70°C), with matched response times across all four channels (∆tpd ≤ 3ns).

Key Specifications

Pinout & Package

MAX903CPA is housed in an 8-pin Plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX903CPA, MAX9203CSA offers identical speed and pinout with half the power and superior PSRR - making it the preferred upgrade path - while LM339N serves fundamentally different use cases due to its microsecond-scale delay, lack of latch, and open-collector architecture.

Availability

MAX903CPA is available at Aetrix Electronics and suitable for high-speed data sampling, precision threshold detection, and PWM timing applications requiring stable component supply and legacy design continuity.

Supply support for MAX903CPA 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 markets.

The MAX900–MAX903 family was designed for high-speed signal discrimination in data acquisition, instrumentation, and real-time control systems - prioritizing propagation delay, latch synchronization, and supply flexibility over ultra-low power or rail-to-rail output swing.

FAQ

What is the operating temperature range for MAX903CPA?

The MAX903CPA is rated for 0°C to +70°C ambient operation, as indicated by the "C" suffix in its ordering code. This commercial-grade temperature range is validated across all electrical specifications including propagation delay (≤15ns), input offset voltage (1–3mV), and latch timing parameters. The device remains functional outside this range but is not guaranteed to meet datasheet limits beyond +70°C or below 0°C.

Does MAX903CPA support single-supply operation?

Yes, MAX903CPA supports true single-supply operation: tie VEE to GND, apply +5V to VCC, and +5V to VDD. Its input common-mode range extends to VEE – 0.1V, allowing ground-referenced inputs, and the TTL outputs function correctly with this configuration. Decoupling capacitors on both VCC and VDD are mandatory to maintain stability and achieve specified 8ns propagation delay.

What is the purpose of the LATCH pin on MAX903CPA?

The LATCH pin on MAX903CPA controls output transparency: when held high (≥1.4V), the comparator responds immediately to input changes; when driven low (≤1.4V), it freezes the current output state regardless of subsequent input transitions. This function is essential for synchronized sampling in multi-channel systems and is fully characterized with defined setup/hold times (ts = 2ns, th = 1ns) and disable delays (tpd+(D) = 10ns).

Can MAX903CPA be used with ±5V analog supplies?

Yes, MAX903CPA is fully specified for ±5V analog operation: connect VCC to +5V, VEE to –5V, and VDD to +5V. In this split-supply mode, the input common-mode range spans –5.1V to +2.75V, supporting bipolar signal detection. The device maintains 8ns typical propagation delay and 18mW/comparator dissipation under these conditions, with all timing and DC parameters guaranteed across the full temperature range.

Is MAX903CPA recommended for new designs?

No - Maxim explicitly states MAX903CPA is "Not Recommended for New Designs" due to discontinuation of its wafer process. While fully supported for existing designs and available through authorized channels, new projects should consider the pin-compatible MAX9203CSA, which matches speed (8ns), halves power (9mW/comparator), and improves PSRR. Lifecycle documentation and long-term supply assurance are available for MAX903CPA through Aetrix Electronics' continuity program.