Analog Devices Inc./Maxim Integrated MAX908CPD+

Overview

MAX908CPD+ from Maxim Integrated is a quad, high-speed, ultra-low-power, single-supply TTL comparator IC designed for precision threshold detection in +5V systems. It delivers 40ns propagation delay (5mV overdrive), 700µA per comparator supply current (3.5mW), and operates with input common-mode range from –0.2V to V₊–1.5V. It is used in battery-powered instrumentation and high-speed sampling circuits where low power and clean switching are critical.

For engineers reviewing the MAX908CPD+ datasheet, MAX908CPD+ pinout, MAX908CPD+ application, or MAX908CPD+ equivalent, key selection considerations include its quad-channel TTL-compatible outputs, internal hysteresis eliminating external feedback resistors, guaranteed 40ns timing at 5mV overdrive, and compatibility with 14-pin DIP packaging for through-hole prototyping and legacy industrial designs.

Technical Context

The MAX908CPD+ implements four independent bipolar comparators with fixed internal hysteresis (≈4mV input-referred), enabling stable switching without external components. Each channel features rail-to-rail input capability down to –0.2V and up to V₊–1.5V, and TTL-compatible push-pull outputs that drive directly into logic loads without pull-ups.

It uses a single +4.5V to +5.5V supply, draws only 2.8mA total quiescent current (700µA per comparator), and maintains 40ns typical propagation delay across temperature (0°C to +70°C). Input offset voltage is specified at 1–3.5mV, and output low/high voltages meet TTL thresholds (V_OL ≤ 0.55V at 3.2mA sink, V_OH ≥ 2.8V at 100µA source).

Key Specifications

Pinout & Package

MAX908CPD+ is supplied in a 14-pin plastic DIP package (0.300" wide), compatible with standard through-hole PCB assembly and socket-based evaluation. Pin spacing is 0.100", and body dimensions are 0.770" × 0.270".

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339N and TLV3704IPW, the MAX908CPD+ uniquely balances TTL compatibility, 40ns speed, and integrated hysteresis in a single +5V quad comparator-making it irreplaceable in legacy 5V systems requiring deterministic, glitch-free edge generation without design rework.

Availability

MAX908CPD+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, high-speed data acquisition, and industrial line receiver designs requiring stable component supply and long-term obsolescence management.

Supply support for MAX908CPD+ 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 and mixed-signal ICs for industrial, communications, and consumer applications.

The MAX907/MAX908/MAX909 family was engineered to replace aging comparator solutions in +5V systems demanding speed, precision, and micropower operation-targeting portable test gear, sensor interfaces, and real-time signal conditioning.

FAQ

Is MAX908CPD+ still recommended for new designs?

No. The MAX908CPD+ is not recommended for new designs, as Maxim discontinued the wafer process used to manufacture the MAX907/MAX908/MAX909 family. However, Aetrix Electronics maintains active inventory and provides lifecycle support for existing programs relying on MAX908CPD+. Engineering teams should evaluate drop-in alternatives like the TLV3704 for future designs.

What is the maximum operating supply voltage for MAX908CPD+?

The absolute maximum positive supply voltage for MAX908CPD+ is +6V, but the recommended operating range is +4.5V to +5.5V. Operation outside this range may degrade propagation delay, increase supply current, or cause output logic violations. The device has no negative supply pin-unlike the MAX909, MAX908CPD+ is strictly single-supply.

Does MAX908CPD+ include internal hysteresis, and how does it affect threshold accuracy?

Yes, MAX908CPD+ incorporates fixed internal hysteresis of approximately 4mV (V_TRIP+ – V_TRIP–). This ensures clean output transitions on slow or noisy inputs without external components. While hysteresis widens the effective threshold window, the center point (V_OS ≈ 1–3.5mV) remains highly stable, preserving accuracy for most discriminator applications.

Can MAX908CPD+ drive standard TTL logic loads directly?

Yes. MAX908CPD+ features true TTL-compatible outputs: VOH ≥ 2.8V (at 100µA source) and VOL ≤ 0.55V (at 3.2mA sink), meeting 74LS and 74F logic thresholds. No external pull-up resistors are needed-outputs can drive up to 10 LS-TTL loads directly, simplifying interconnect in mixed-logic systems.

What package type and lead finish does MAX908CPD+ use?

MAX908CPD+ is supplied in a 14-pin plastic DIP (dual in-line package) with matte tin lead finish. The "PD" suffix explicitly denotes Plastic DIP, and the "+" indicates tape-and-reel packaging compliant with JEDEC J-STD-020 moisture sensitivity Level 1. Lead pitch is 0.100", and body width is 0.300".