Z8523320FSC

Specialized Overview

The Z85233 is an Enhanced Mono Serial Communication Controller (EMSCC) from Zilog, serving as a single-channel variant of the Z85230 ESCC. It operates on CMOS technology with a 7000-gate count and supports data rates up to 16 MHz via PCLK. The device features a 4-byte transmit FIFO and an 8-byte receive FIFO to reduce CPU overhead. It includes hardware support for SDLC packet handling, automatic flag transmission, and interrupt daisy-chaining. Standard test conditions specify a VCC range of +4.50V to +5.50V.

Specialized Feature Summary

• Integrated 4-byte transmit and 8-byte receive FIFOs to minimize processor intervention during data transfers.
• Hardware automation for SDLC protocols, including automatic flag insertion, Tx Underrun/EOM latch reset, and ABORTed frame handling.
• Simplified CPU interface through relaxed databus setup times and software-generated interrupt acknowledge signals.
• Supports interrupt daisy-chaining via IEI and IEO pins for efficient multi-device system integration.

Specialized Applications

• High-performance serial communication interfaces requiring reduced CPU load.
• SDLC protocol implementations utilizing hardware-assisted packet handling.
• Multi-controller systems employing interrupt daisy-chain architectures.

Specialized Procurement Notes

Verify the specific package suffix against the ordering information in the datasheet, as the FSC suffix typically denotes a Plastic Quad Flat Package. Confirm voltage requirements align with standard +5V logic levels. Check for RoHS compliance status if environmental regulations apply to the target assembly process. Ensure pin compatibility with existing SCC/ESCC designs before finalizing procurement.

Specialized Selection Notes

Select this component when a single-channel serial controller is sufficient, offering a cost-effective alternative to the dual-channel Z85230. Consider the enhanced FIFO depths if application latency requires buffering larger data blocks. Verify that the host microprocessor can accommodate the simplified interface timing constraints. Evaluate the need for SDLC hardware acceleration versus software-only implementation for the specific protocol stack.

Specialized Part Context

The Z85233 belongs to Zilog's SCC family introduced in 1981, representing an evolution toward Superintegration Technology. It maintains software compatibility with earlier SCC models while introducing significant performance improvements. This lineage ensures backward compatibility for legacy designs while providing modern enhancements like deeper FIFOs and streamlined interrupt handling for contemporary embedded applications.

Specialized Replacement Considerations

The Z85230 ESCC serves as the dual-channel counterpart. Direct replacement requires verifying pinout compatibility and ensuring the additional channel resources of the Z85230 are not required. Software drivers designed for the EMSCC may require modification if migrating to or from the base SCC model due to FIFO and interrupt differences.