CS8900A-CQ3Z

Controllers Overview

The CS8900A-CQ3Z is a low-cost Ethernet LAN controller optimized for the Industry Standard Architecture (ISA) bus and general-purpose microcontroller buses. Manufactured by Cirrus Logic, this component integrates MAC and PHY functions compliant with IEEE 802.3 standards, supporting 10 Mbps transmission rates in full-duplex or half-duplex modes. It operates on a 3.3V supply voltage with a maximum current consumption of 55 mA. The device utilizes a 100-pin TQFP/LQFP package and supports commercial temperature ranges from 0°C to 70°C. Key architectural features include an internal PacketPage structure, on-chip RAM buffers, and direct ISA bus interface capabilities.

Controllers Feature Summary

• Integrates 10BASE-T port with automatic polarity detection and correction alongside AUI support for legacy media connections
• Utilizes efficient PacketPage architecture to automatically adapt to varying network traffic patterns and system resources
• Supports multiple data transfer modes including I/O mapping, memory space access, and DMA slave operation

Controllers Applications

• Embedded industrial control systems requiring ISA bus connectivity
• Network communication devices and embedded Linux platforms
• Portable equipment and network all-in-one machines

Controllers Procurement Notes

Verify RoHS compliance status as indicated by the Z suffix. Confirm package integrity for the 100-pin TQFP variant. Check for obsolete lifecycle status which may impact long-term availability. Ensure supplier documentation matches Cirrus Logic specifications exactly. Validate operating voltage requirements against the specific 3.3V designation.

Controllers Selection Notes

Select this model when 3.3V logic compatibility is required for ISA bus interfaces. Choose over standard variants if RoHS environmental compliance is mandatory for the target application. Consider the integrated filters and on-chip RAM to reduce external component count compared to older discrete solutions. Verify that the commercial temperature range meets the operational environment constraints.

Controllers Part Context

This part belongs to the Crystal LAN series of Ethernet controllers designed for cost-sensitive embedded applications. It serves as a bridge between microcontrollers and Ethernet networks using legacy ISA interfaces. The CQ3Z suffix specifically denotes the 3.3V operating voltage and RoHS-compliant packaging within the broader CS8900A family.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in verified sources. Due to the obsolete lifecycle status, direct pin-to-pin replacements may require adapter boards or driver modifications. Evaluate modern alternatives with native SPI or SDIO interfaces if ISA bus support is no longer required.