Z84C9010VSG00TR

Specialized Overview

The Z84C9010VSG 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 supports bus clock frequencies of 8, 10, and 12.5 MHz, with the VSG suffix indicating a 10 MHz variant. It operates on a single +5 V power supply within a voltage range of 4.5 V to 5.5 V. The component utilizes an 84-pin PLCC surface-mount package and functions as an I/O controller interface IC compatible with the Z80 family.

Specialized Feature Summary

• Integrates two independent synchronous/asynchronous serial channels, three 8-bit parallel ports, and four independent counter/timer channels.
• Includes an on-chip clock oscillator/driver supporting crystal or TTL-compatible inputs.
• Supports Z80 Family interrupt daisy chain with programmable priority levels for internal peripherals.
• Features software/hardware resets allowing individual peripheral control without resetting the entire unit.

Specialized Applications

• Peripheral expansion for Z80-based microprocessor systems
• Serial communication interfaces requiring full duplex asynchronous or synchronous protocols
• Hardware timing and event counting applications using dedicated counter/timer channels

Specialized Procurement Notes

Verify current availability status as this component may be discontinued. Confirm package integrity and moisture sensitivity handling requirements before installation. Ensure compatibility with existing system voltage levels and clock frequencies. Review official documentation for any specific end-of-life notifications or alternative part recommendations from the manufacturer.

Specialized Selection Notes

Select this component when a Z80-based system requires integrated serial, parallel, and timer functionality in a single package. Verify that the 10 MHz operating frequency matches the system bus requirements. Ensure the design accommodates the 84-pin PLCC footprint and provides necessary decoupling for the single +5 V supply rail.

Specialized Part Context

This part belongs to the Z84C90 KIO series, which combines multiple Zilog peripheral functions. The 'V' indicates the 84-pin PLCC package, while 'S' typically denotes speed grade or temperature range variations within the family. The 'G' suffix often relates to lead-free or environmental compliance standards.

Specialized Replacement Considerations

Check for Z84C9010ASC (100-pin LQFP) if pinout adaptation is feasible. Consider Z84C9008VSG for lower frequency requirements. Verify electrical compatibility and register mapping before substitution.

Specialized FAQ

What is the function of the PIA port in the Z84C90?

The Parallel Interface Adapter (PIA) port provides an additional 8 bits of bit-programmable I/O. It can be multiplexed to provide modem control signals for the serial channels or used as general-purpose I/O without handshake capabilities.

How does the Z84C90 handle interrupt priorities?

The Command Logic Unit allows configuration of the internal interrupt daisy chain. Users can program the Command Register to set the priority sequence among the SIO, CTC, and PIO devices, or exclude them from the chain entirely.

Can the Z84C90 operate with CPUs other than the Z80?

Yes, while optimum performance is obtained with a Z84C00 CPU, the KIO can be used with any other CPU that supports the required bus cycles and signal interfaces.