Z84C9008ASC

Specialized Overview

The Z84C9008ASC is a Serial/Parallel Counter/Timer KIO peripheral manufactured by Zilog. It integrates multiple I/O functions into a single 100-pin LQFP package, including two synchronous/asynchronous serial channels, three 8-bit parallel ports, and four independent counter/timer channels. The device features an on-chip clock oscillator/driver and supports bus clock frequencies of 8 MHz. Designed for low power operations using CMOS technology, it operates on a single +5 V power supply and supports the Z80 Family interrupt daisy chain with programmable priorities.

Specialized Feature Summary

• Integrates two independent serial channels, three 8-bit parallel ports, and four counter/timer channels within a single package
• Includes an on-chip clock oscillator/driver capable of accepting crystal or TTL-compatible clock inputs
• Supports software/hardware resets for individual internal devices without resetting the entire peripheral
• Features programmable interrupt priorities and compatibility with Z80 Family interrupt daisy chains

Specialized Applications

• Multichannel I/O peripheral solutions for embedded systems
• Serial communications applications supporting asynchronous and synchronous protocols
• Event counting, interval timing, and serial baud rate clock generation
• Interfaces for keyboards, printers, and EPROM/PAL programmers

Specialized Procurement Notes

Verify the specific ordering suffix ASC to confirm the 100-pin LQFP package and 8 MHz frequency rating. Confirm RoHS compliance status and check for any End-of-Life notices from Zilog prior to procurement. Ensure the component meets the required environmental operating temperatures specified in the datasheet.

Specialized Selection Notes

Select this part when a system requires integrated serial, parallel, and timer functionalities to reduce board space. Choose the Z84C9008ASC specifically for designs requiring an 8 MHz bus clock speed and a 100-pin LQFP footprint. Verify that the host CPU is compatible with the Z80 Family interface requirements.

Specialized Part Context

This component belongs to the Z84C90 KIO family, which combines the features of a Z84C30 CTC, a Z84C20 PIO, and a Z84C4x SIO. The Z84C9008ASC variant is distinguished by its 100-pin LQFP packaging and 8 MHz maximum operating frequency, differentiating it from PLCC variants or higher-speed models.

Specialized Replacement Considerations

Direct replacements include other Z84C90 series parts such as the Z84C9008VEC or Z84C9008VSC, though these utilize an 84-pin PLCC package. Higher frequency options like the Z84C9010ASC are available in the same package but operate at 10 MHz.