Z8523320FSC00TR

Specialized Overview

The Z85233 EMSCC is a single-channel CMOS serial communication controller from the Zilog SCC family. It operates at clock frequencies up to 16 MHz with a supply voltage range of 4.5V to 5.5V. The device features an 8-bit data bus and includes a 4-byte transmit FIFO and an 8-byte receive FIFO to reduce CPU overhead. It supports full-duplex data communications and various protocols including SDLC, HDLC, and asynchronous modes. Available in 44-pin PLCC and PQFP packages, it provides hardware interface simplification through software-generated interrupt acknowledge signals.

Specialized Feature Summary

• Integrated 4-byte transmit and 8-byte receive FIFOs for reduced CPU intervention
• Automatic packet handling improvements for SDLC mode including flag transmission and frame management
• Simplified CPU hardware interface with relaxed databus setup times and software interrupt acknowledge generation
• Full-duplex data communications capability supporting multiple popular protocols

Specialized Applications

• Serial data communications systems requiring protocol support
• Microprocessor-based designs needing simplified interface logic
• SDLC packet handling applications
• Embedded systems utilizing Zilog SCC/ESCC compatible architectures

Specialized Procurement Notes

Verify package type availability as the component is offered in both PLCC and PQFP configurations. Confirm operating temperature range specifications against system requirements. Ensure power supply voltages remain within the 4.5V to 5.5V operational limits. Check for specific ordering suffixes that may indicate variations in packaging or temperature ratings. Validate pin assignments match the target PCB footprint design.

Specialized Selection Notes

Select this component when a single-channel serial controller is sufficient for the application. Consider the FIFO depths if buffer requirements exceed the integrated capacities. Evaluate timing constraints to ensure compatibility with the host microprocessor's bus speed. Compare interface logic reduction benefits against alternative dual-channel controllers if future expansion is anticipated.

Specialized Part Context

The Z85233 serves as the single-channel variant within Zilog's Enhanced Mono Serial Communication Controller (EMSCC) family. It shares architectural similarities with the Z85230 ESCC but focuses on Channel A operations only. This positioning allows for cost-effective solutions in systems where only one serial port is required while maintaining software compatibility with broader SCC family designs.

Specialized Replacement Considerations

Direct replacements include other Z85233 variants with different package options such as PLCC or PQFP. Verify software compatibility if substituting with older SCC models like the Z85230, noting the absence of FIFOs in legacy parts. Ensure any substitute maintains the 16 MHz maximum clock frequency requirement.