Z8523310VSC

Specialized Overview

The Z85233 is a single-channel Enhanced Mono Serial Communication Controller (EMSCC) from Zilog, serving as the Channel A variant of the Z85230 ESCC. It operates on CMOS technology within a 4.5V to 5.5V supply range and supports clock frequencies up to 16 MHz. The device features a 4-byte transmit FIFO and an 8-byte receive FIFO to reduce CPU overhead. It supports asynchronous, synchronous byte, HDLC, SDLC, X.25, BISYNC, and extended synchronous protocols with encoding methods including NRZ, NRZI, FM1, FM0, and Manchester. The controller is available in 44-pin PLCC and PQFP packages.

Specialized Feature Summary

• Integrated 4-byte transmit and 8-byte receive FIFOs for efficient data handling
• Automatic SDLC packet processing including flag transmission and frame reset
• Simplified CPU interface with software-generated interrupt acknowledge support
• Full-duplex operation supporting multiple communication protocols

Specialized Applications

• SDLC data link control implementations
• HDLC protocol communications
• X.25 network interfaces
• BISYNC system controllers

Specialized Procurement Notes

Verify package type availability, as the Z85233 is offered in both PLCC and PQFP configurations. Confirm that the specific ordering suffix matches the required pinout and thermal characteristics. Check current production status, as older silicon revisions may be subject to obsolescence notices. Ensure compatibility with existing 5V logic levels and timing requirements before finalizing procurement.

Specialized Selection Notes

Select the Z85233 when a single serial channel is sufficient, offering cost savings over the dual-channel Z85230. Choose the PLCC package for surface mount applications requiring a ceramic leaded chip carrier form factor. Consider the PQFP option if a plastic quad flat pack is preferred for board space constraints. Verify that the system clock can support the desired baud rates, as the maximum data rate is limited to one-quarter of the PCLK frequency.

Specialized Part Context

The Z85233 belongs to Zilog's SCC family introduced in 1981, utilizing Superintegration Technology. It is functionally compatible with earlier SCC designs while providing improved performance through deeper FIFOs and simplified hardware interfaces. This component serves as the mono-channel counterpart to the Z85230 ESCC, maintaining software compatibility across the series.

Specialized Replacement Considerations

The Z85230 ESCC is the dual-channel equivalent but requires additional address lines for channel selection. Direct pin-to-pin replacement is not possible due to different pinouts between PLCC and PQFP packages. No active direct substitutes are documented; legacy replacements require careful interface logic verification.