Z8S18020PSG

Overview

The Z8S18020PSG is an 8-bit microprocessor based on the Z180 core, operating at a maximum clock frequency of 20 MHz. It features a single core with an 8-bit data bus width and supports up to 1 MB of addressable memory via its MMU. The device operates on a 3.3 V supply voltage with matching I/O levels. It is housed in a 64-pin DIP package designed for through-hole mounting. The unit functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Code compatible with ZiLOG Z80 CPU while providing extended instructions and faster execution speeds.
• Integrates two chain-linked DMA channels for high-speed memory and I/O transfers.
• Includes two enhanced UARTs supporting asynchronous data transfer rates up to 512 Kbps.
• Offers multiple low power-down modes including Stop, Sleep, and Halt to reduce energy consumption.

Applications

• Industrial control systems requiring robust interrupt handling and peripheral integration.
• Embedded applications needing extended memory addressing capabilities beyond standard 64 KB limits.
• Communication interfaces utilizing dual UARTs for serial data transmission and reception.
• Systems requiring direct memory access for efficient data movement without CPU intervention.

Procurement Notes

Verify component authenticity against official Zilog documentation prior to implementation. Confirm that the specific ordering suffix corresponds to the required package type and voltage specifications. Ensure compatibility with existing system clocks and voltage regulators. Check for end-of-life status or discontinuation notices from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when backward compatibility with Z80 software is required alongside enhanced peripheral features. Consider the 64-pin DIP package if through-hole assembly is mandated by the PCB design. Evaluate the 3.3 V operating requirement against available power supplies. Assess the need for extended memory mapping and integrated serial interfaces to justify the selection over simpler processors.

Part Context

This part belongs to the Z8S180 series, which enhances the original Z80 architecture with additional system resources. The Z180 core provides object-code compatibility while adding features like DMA and expanded interrupts. This specific model represents the static version optimized for lower power consumption compared to earlier dynamic variants.

Replacement Considerations

Z8L18020PSG