Z84C9008VSC

Specialized Overview

The Z84C9008VSC is a Serial/Parallel Counter/Timer KIO peripheral manufactured by Zilog. It integrates multiple I/O functions into an 84-pin PLCC package, supporting an 8 MHz bus clock frequency. The device operates on a single +5 V power supply and utilizes CMOS technology for low power consumption. Key internal components include two independent synchronous/asynchronous serial channels, three 8-bit parallel ports, four independent counter/timer channels, and an on-chip clock oscillator/driver. It supports the Z80 Family interrupt daisy chain with programmable priorities.

Specialized Feature Summary

• Integrates two independent synchronous/asynchronous serial channels, three 8-bit parallel ports, and four independent counter/timer channels within a single package.
• Includes an on-chip clock oscillator/driver capable of accepting crystal or TTL-compatible clock inputs to generate MOS-compatible clock outputs.
• Supports Z80 Family interrupt daisy chains with software-configurable priority levels among internal peripherals.

Specialized Applications

• System design requiring integrated serial and parallel I/O capabilities without external logic.
• Applications utilizing event counting, interval timing, or serial baud rate clock generation via the CTC unit.
• Embedded systems employing Z80 family processors needing cost-effective peripheral solutions.

Specialized Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm that the specific ordering suffix matches the required package type and electrical specifications. Ensure compliance with RoHS directives if applicable to the project requirements. Review the latest product specification documents for any updates regarding life support policies or usage restrictions before procurement.

Specialized Selection Notes

Select this component when a system requires a consolidated solution for serial communication, parallel data handling, and precise timing control. The 8 MHz frequency rating suits applications not demanding higher clock speeds. Consider the 84-pin PLCC package constraints during PCB layout. Evaluate the need for the integrated oscillator against existing system clock architectures to optimize board space and component count.

Specialized Part Context

This part belongs to the Z84C90 KIO series, which combines features of the Z84C30 CTC, Z84C20 PIO, and Z84C4x SIO. The '08' designation indicates the 8 MHz operating speed, while 'VSC' specifies the 84-pin PLCC package variant. It serves as a comprehensive I/O expansion peripheral for Z80-based microprocessor systems.

Specialized Replacement Considerations

Direct replacements must match the 84-pin PLCC package and 8 MHz frequency. Verify pin compatibility with the Z84C9008VEC. Cross-reference with other Z84C90 variants only if frequency and package differences are acceptable within the system design parameters.

Specialized FAQ

What types of clock inputs does the Z84C9008VSC support?

The device accepts either a fundamental parallel resonant crystal connected to XTAL1 and XTAL0 pins or a TTL-compatible clock input on the CLOCK pin.

How many counter/timer channels are available in this peripheral?

The Z84C9008VSC provides four independent 8-bit counter/timer channels (Channels 0 through 3) compatible with the Z84C30 CTC.

Can the interrupt priority be configured internally?

Yes, the Command Logic Unit allows users to configure the internal interrupt daisy chain sequence, enabling programming of preferred priority levels among the SIO, CTC, and PIO devices.