Z8L18020PSC

Overview

The Z8L18020PSC is a microprocessor IC based on the Z180 core, manufactured by Zilog. It features an 8-bit architecture with a maximum clock speed of 20 MHz and operates within a temperature range of 0°C to +70°C. The device utilizes a 64-pin DIP package and supports through-hole mounting. Key electrical specifications include a 3.3V I/O voltage level. It integrates two asynchronous serial communication interfaces (ASCI), a clocked serial I/O port, and two timer/counters.

Feature Summary

• Provides full backward compatibility with existing ZiLOG Z80 CPU instruction sets while offering extended instructions for enhanced performance.
• Integrates two chain-linked DMA channels that allow for nonstop data transfer operations between memory and I/O devices.
• Includes two enhanced UARTs with ESCC-like baud rate generators supporting asynchronous data transfer rates up to 512 Kbps.
• Features multiple low-power-down modes including Stop Mode and Standby Mode to reduce power consumption during idle periods.

Applications

• Embedded systems requiring Z80 code compatibility with expanded memory addressing capabilities.
• Industrial control applications utilizing integrated timers and asynchronous serial communication interfaces.
• Data acquisition systems employing direct memory access for high-speed peripheral interfacing.
• Communication equipment requiring reliable UART functionality with FIFO buffer support.

Procurement Notes

Verify component authenticity as this part is officially marked obsolete by the manufacturer. Confirm package integrity upon receipt, specifically checking for pin alignment in the 64-DIP configuration. Ensure voltage levels match system requirements, noting the 3.3V I/O specification. Review datasheet revisions for any timing parameter updates before final integration into new designs.

Selection Notes

Select this component when legacy Z80 software compatibility is mandatory alongside modern feature enhancements like DMA chaining and MMU support. Consider the 64-DIP package constraint if surface-mount alternatives are not viable. Evaluate the 3.3V I/O requirement against existing system logic levels. Assess thermal management needs for the specified commercial temperature range.

Part Context

This microprocessor belongs to the Z180 family, which enhances the original Z80 architecture with additional peripherals and improved execution speeds. The Z8L180 variant specifically denotes low-voltage operation compared to the standard Z8S180. It serves as a bridge between legacy Z80 ecosystems and more complex embedded requirements without requiring complete architectural migration.

Replacement Considerations

Public confirmed substitute part numbers: Z8S18020PSC.