Analog Devices Inc./Maxim Integrated MAX902CPD

Overview

MAX902CPD from Maxim Integrated is a high-speed, low-power quad voltage comparator with differential analog inputs and TTL-compatible outputs featuring active internal pull-ups and independent latch inputs. It delivers 8ns typical propagation delay at 5mV overdrive, consumes 18mW per comparator at +5V, supports ±5V or +5V-to-+10V analog supplies with negative-rail input sensing, and operates from 0°C to +70°C in a 14-pin plastic DIP package - ideal for high-speed A/D converter front-ends and line receivers.

For engineers reviewing the MAX902CPD datasheet, MAX902CPD pinout, MAX902CPD application, or MAX902CPD equivalent, key selection considerations include latch-enabled output hold capability, dual-supply isolation (VCC/VEE analog, VDD digital), TTL-level timing compatibility, and thermal stability across industrial temperature ranges - all critical for precision sampling and real-time threshold detection circuits.

Technical Context

The MAX902CPD implements four independent high-gain comparators with fully differential analog inputs referenced to VEE (analog ground/subsystem), each equipped with a dedicated TTL-compatible latch input that freezes output state on low assertion. Its architecture separates analog (VCC/VEE) and digital (VDD/GND) supply domains to minimize noise coupling in mixed-signal systems.

Propagation delay is tightly specified at 8ns (typ) for both rising and falling edges under 5mV overdrive into 15pF load, with ≤2ns inter-channel skew (∆tpd). Input common-mode range extends to VEE − 0.1V, enabling ground-referenced single-supply operation when VEE = GND, while maintaining full 5mV overdrive performance across −40°C to +85°C for higher-grade variants.

Key Specifications

Pinout & Package

MAX902CPD is housed in a 14-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing follows JEDEC MS-001 standard (0.1-inch pitch), compatible with standard DIP sockets and wave-soldering processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX902CPD, MAX9202CSD offers identical speed and latch capability at half the power, making it the preferred upgrade path; LM339N lacks both speed and latch features, limiting it to basic DC-level detection without timing constraints.

Availability

MAX902CPD is available at Aetrix Electronics and suitable for high-speed data acquisition, precision threshold monitoring, and legacy industrial control systems requiring stable component supply and long-term obsolescence support.

Supply support for MAX902CPD 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 precision analog, mixed-signal, and high-speed interface ICs for industrial, communications, and computing applications.

The MAX900–MAX903 family was designed specifically for high-speed, low-power voltage comparison in data conversion, sampling, and real-time signal discrimination - emphasizing propagation delay consistency, latch-controlled capture, and analog/digital supply separation.

FAQ

What is the maximum operating frequency supported by the MAX902CPD in a sampling application?

The MAX902CPD achieves 8ns typical propagation delay at 5mV overdrive, supporting effective sampling decisions up to ~125MHz. Real-world usable frequency depends on input slew rate, layout parasitics, and load capacitance; Figure 8 in the datasheet shows clean response to 100MHz sine-wave inputs. For reliable operation, maintain input overdrive ≥5mV and CL ≤15pF as characterized.

Does the MAX902CPD require separate analog and digital ground planes?

While the MAX902CPD supports separate analog (VEE) and digital (GND) grounds to isolate noise, it does not mandate split planes. In single-supply operation (VEE = GND), a solid low-inductance ground plane is essential. When using split supplies (±5V), connecting AGND and DGND at a single point near the device minimizes ground loops while preserving noise isolation benefits.

Can the MAX902CPD operate from a single +5V supply?

Yes - the MAX902CPD can operate from a single +5V supply by tying VEE to GND and applying +5V to both VCC and VDD. Input common-mode range then extends from GND to +2.75V (VCC − 2.25V), enabling ground-referenced sensing. Power dissipation remains 18mW per comparator, and latch functionality is fully retained.

What is the purpose of the N.C. pin (Pin 6) on the MAX902CPD?

Pin 6 on the MAX902CPD is explicitly designated "N.C." (No Connection) in the official Maxim datasheet and has no internal connection. It must remain unconnected in all designs - neither tied to GND, VCC, nor left floating. Routing traces or vias to this pin may cause unintended coupling or mechanical stress during assembly.

How does the latch function affect timing behavior in the MAX902CPD?

When the latch input (e.g., Pin 4 for Channel A) is driven low, the corresponding output (Pin 5) holds its last valid state regardless of subsequent input changes. The latch disable-to-output delay (tpd+(D)/tpd−(D)) is 10ns/12ns typical, meaning output updates occur within 12ns after latch release. This enables precise synchronous sampling windows controlled by external logic.