CS8900A-CQZ: Ethernet Controller IC by Cirrus Logic Inc. - Complete Guide

The CS8900A-CQZ is a high-performance Ethernet controller integrated circuit (IC) developed by Cirrus Logic Inc., a pioneer in semiconductor solutions. Although now classified as obsolete, this IC remains highly relevant for vintage computing enthusiasts, industrial legacy systems, and educational purposes. This guide provides an in-depth analysis of its specifications, features, and modern-day applications to help you understand its enduring value.

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Product Overview

The CS8900A-CQZ falls under the Interface - Controllers subcategory of Integrated Circuits (ICs). Designed for Ethernet connectivity, it supports the 10 Base-T PHY standard, making it compatible with twisted-pair cabling for reliable 10 Mbps data transfer. Its versatility allows integration into PCs, embedded systems, and industrial hardware.

Key Features

• Manufacturer Part Number: CS8900A-CQZ
• Manufacturer: Cirrus Logic Inc.
• Description: IC LAN Ethernet Controller, 3V/5V, 100-LQFP (14x14 mm)
• Interface: ISA (Industry Standard Architecture)
• Data Rate: 10 Mbps (10 Base-T)
• Voltage Supply: 3V to 5V
• Operating Current: 95mA (max)
• Temperature Range: 0 C to 70 C

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Technical Specifications

Performance & Compatibility

The CS8900A-CQZ is engineered for seamless Ethernet communication, adhering to IEEE 802.3 standards. Its ISA bus interface ensures compatibility with older PC architectures, while the 10 Base-T PHY support guarantees stable connectivity over standard twisted-pair cables. The IC s efficient power management (3V 5V operation) makes it suitable for both low-power and traditional systems.

Power Efficiency

• Supply Voltage: 3V or 5V ( 10% tolerance)
• Current Draw: 95mA (typical)
• Power Consumption: Optimized for energy-sensitive applications

Physical Design

Encased in a 100-LQFP package (14x14 mm), the IC offers a compact footprint with excellent thermal performance. The Leaded Quad Flat Pack (LQFP) ensures easy PCB mounting and durability in demanding environments.

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Applications of CS8900A-CQZ

Despite its obsolete status, the CS8900A-CQZ is invaluable for:

• Legacy System Maintenance: Repairing or upgrading vintage computers and industrial machines.
• Educational Demonstrations: Teaching networking fundamentals and hardware integration.
• Retro Computing Projects: Building custom Ethernet cards for classic PCs.
• Embedded Systems: Low-cost networking solutions for prototypes.

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Why Choose the CS8900A-CQZ?

While newer alternatives exist, the CS8900A-CQZ stands out for:

• Proven Reliability: Trusted in early Ethernet applications.
• Simplified Design: Easy to integrate into ISA-based systems.
• Cost-Effectiveness: Affordable for hobbyists and educators.

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Obsolete but Not Forgotten

Cirrus Logic has discontinued the CS8900A-CQZ, but demand persists in niche markets. Our inventory ensures access to genuine components for your projects. We offer:

• Authentic Parts: Sourced directly from trusted suppliers.
• Fast Shipping: Worldwide delivery with tracking.
• Expert Support: Assistance for technical queries.

Ready to purchase? Click here to order the CS8900A-CQZ today!

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By understanding the CS8900A-CQZ s capabilities, you can leverage its strengths for specialized applications. Whether preserving history or experimenting with hardware, this IC remains a cornerstone of early networking technology.