Z84C9008ASG

Specialized Overview

The Z84C9008ASG is a Serial/Parallel Counter/Timer KIO peripheral manufactured by Zilog. It integrates the functions of a Z84C30 CTC, a Z84C20 PIO, and a Z84C4x SIO into a single device. The component operates at an 8 MHz bus clock frequency and utilizes a 100-pin LQFP package. It supports a single +5 V power supply and includes an on-chip clock oscillator/driver. The device features two independent synchronous/asynchronous serial channels, three 8-bit parallel ports, four independent counter/timer channels, and an 8-bit bit-programmable I/O port.

Specialized Feature Summary

• Integrates multiple peripheral functions including a Parallel Input/Output unit, a Counter/Timer unit, and a Serial I/O unit within a single package.
• Supports software and hardware resets for individual internal devices without resetting the entire KIO.
• Features programmable interrupt priorities and supports the Z80 Family interrupt daisy chain configuration.

Specialized Applications

• System environments requiring combined serial communication and parallel data handling.
• Applications utilizing event counting, interval timing, or serial baud rate clock generation.
• Systems interfacing with keyboards, printers, or EPROM/PAL programmers via parallel ports.

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and speed grade. Confirm availability status directly with the supplier as legacy components may have limited stock. Ensure the procurement source provides valid traceability for the Z84C90 series.

Specialized Selection Notes

Select this part when a system requires integrated serial, parallel, and timer functionalities to reduce board space. Ensure the design accommodates the 100-pin LQFP footprint. Verify that the required bus clock frequency aligns with the 8 MHz specification provided in the datasheet.

Specialized Part Context

This component belongs to the Z84C90 KIO family, which combines Z84C30, Z84C20, and Z84C4x logic units. The 'ASG' suffix typically denotes the 100-pin LQFP package variant operating at 8 MHz, distinct from the 84-pin PLCC versions found in other family members.

Specialized Replacement Considerations

Direct replacements are not explicitly listed in the provided documentation. Consider evaluating other Z84C90 variants such as the Z84C9008ASC or Z84C9010ASC if pin compatibility and frequency requirements allow.