Z84C9010VSC

Specialized Overview

The Z84C9010VSC 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; the VSC suffix indicates a 10 MHz maximum frequency. It utilizes a standard +5 V power supply and operates within a commercial temperature range of 0°C to +70°C. The component is housed in an 84-pin PLCC (Plastic Leaded Chip Carrier) surface-mount package.

Specialized Feature Summary

• Integrates two independent synchronous/asynchronous serial channels for full-duplex communication.
• Includes three 8-bit parallel ports: two byte-wide programmable I/O ports and one bit-programmable port.
• Features four independent 8-bit counter/timer channels with prescalers for timing applications.
• Contains an on-chip clock oscillator/driver supporting crystal or TTL-compatible inputs.

Specialized Applications

• Serial-to-parallel and parallel-to-serial data conversion for asynchronous and synchronous protocols.
• Event counting and interval timing generation using dedicated counter channels.
• Keyboard, printer, and EPROM/PAL programmer interface control via parallel ports.
• System interrupt management through programmable priority daisy chains.

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm the exact clock speed rating and package variant. Confirm that the 84-pin PLCC footprint matches the target PCB design. Check for moisture sensitivity levels and storage requirements prior to assembly.

Specialized Selection Notes

Select this component when a Z80-family system requires consolidated I/O, serial, and timer functions in a single chip. Ensure the host CPU supports the required address decoding for the fifteen internal registers. Verify that the available pin count accommodates all necessary handshake and modem control signals.

Specialized Part Context

This part belongs to the Z84C90 KIO family, which combines multiple discrete peripherals into one unit. Other variants in the series include the Z84C9008VSC (8 MHz) and Z84C9012VSC (12 MHz), sharing the same 84-pin PLCC package but differing in maximum operating frequency.

Specialized Replacement Considerations

Direct functional replacements within the same package are limited due to the integrated nature of the KIO. Consider the Z84C9008VSC if a lower 8 MHz clock speed is acceptable. For systems requiring higher speeds, the Z84C9012VSC offers a 12 MHz option in the identical physical package.