Z8523310ASG

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 at clock frequencies up to 16 MHz with a supply voltage range of +4.50 V to +5.50 V. The device features a 4-byte transmit FIFO and an 8-byte receive FIFO to reduce CPU overhead. It supports protocols including SDLC, HDLC, and X.25, utilizing NRZ or NRZI encoding. Available in PQFP and PLCC packages, it provides full-duplex data communications with software-compatible control registers.

Specialized Feature Summary

• Integrated FIFO buffers for improved packet handling and reduced processor intervention
• Automatic protocol management for SDLC frame transmission and error recovery
• Simplified CPU interface with relaxed bus setup times and software interrupt generation

Specialized Applications

• High-speed serial data communication interfaces
• SDLC and HDLC network controller implementations
• X.25 packet switching systems

Specialized Procurement Notes

Verify the specific suffix 'ASG' against the manufacturer's current ordering specification to confirm package type and temperature grade. Confirm availability status as legacy components may have limited production runs. Ensure the design accommodates the required 5V logic levels and timing constraints defined in the AC characteristics.

Specialized Selection Notes

Select this component when a single-channel solution is sufficient, avoiding the dual-channel complexity of the Z85230. Verify that the system clock can support the required baud rates, noting the maximum data rate is one-quarter of the PCLK frequency. Ensure the host microprocessor interface matches the simplified bus requirements to minimize external logic.

Specialized Part Context

The Z85233 belongs to Zilog's SCC family introduced in 1981, representing an evolution toward Superintegration technology. It maintains register compatibility with earlier SCC models while adding hardware enhancements like FIFOs. This lineage allows for migration from older designs without significant software modifications.

Specialized Replacement Considerations

The Z85230 ESCC serves as the dual-channel counterpart. For direct pin-compatible replacements within the same package, verify the Z85233 series variants. Cross-reference with the Z85C30 if CMOS process upgrades are required, though software compatibility must be validated.