Z84C9008ASC00TR

Specialized Overview

The Z84C9008ASC00TR is a Serial/Parallel Counter/Timer KIO peripheral manufactured by Zilog. It integrates a Z84C30 CTC, Z84C20 PIO, and Z84C4x SIO with an on-chip oscillator into a single package. The device operates at a maximum bus clock frequency of 8 MHz and requires a single +5 V power supply. It is housed in a 100-pin LQFP package and supports software/hardware resets. The component features two independent synchronous/asynchronous serial channels, three 8-bit parallel ports, four independent counter/timer channels, and programmable interrupt priorities.

Specialized Feature Summary

• Integrates multiple I/O peripherals including a Parallel Input/Output unit, Counter/Timer logic, and Serial I/O channels within a single chip.
• Includes an on-chip clock oscillator/driver capable of accepting crystal or TTL-compatible clock inputs to reduce external circuitry.
• Supports configurable internal interrupt daisy chains allowing users to set priority sequences among the integrated peripherals.

Specialized Applications

• System environments requiring combined serial communication and parallel data handling
• Applications utilizing event counting, interval timing, or baud rate clock generation
• Embedded systems interfacing with keyboards, printers, or EPROM programmers

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and speed grade. Confirm availability status as legacy components may have limited production runs. Ensure compatibility with existing system voltage levels and interface requirements before procurement.

Specialized Selection Notes

Select this component when a Z80-family CPU requires a consolidated I/O solution without external discrete logic. Verify that the 100-pin LQFP footprint matches the target PCB layout. Ensure the system design accommodates the required crystal oscillator components for the on-chip clock generator.

Specialized Part Context

This part belongs to the Z84C90 KIO family, which combines standard Zilog peripheral functions into a high-pin-count package. It is designed to work optimally with Z84C00 CPUs but remains compatible with other processors in the Z80 family. The device simplifies board design by reducing the component count needed for comprehensive I/O management.

Specialized Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Evaluate pin-compatible alternatives within the Z84C90 series if different speed grades or packages are required, ensuring functional register compatibility.