Z8523020VSG

Specialized Overview

The Z8523020VSG is an Enhanced Serial Communications Controller (ESCC) manufactured by Zilog. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 20 MHz. The device is housed in a 44-PLCC package with surface mount installation. It features two independent serial channels, each equipped with a 4-byte transmit FIFO and an 8-byte receive FIFO. The component complies with RoHS3 standards and has a Moisture Sensitivity Level (MSL) of 3.

Specialized Feature Summary

• Supports dual-channel asynchronous and synchronous data communications with programmable baud rate generation.
• Includes integrated hardware FIFO buffers for both transmission and reception to optimize CPU utilization.
• Provides vectored interrupt capabilities with daisy-chain support for efficient system resource management.

Specialized Applications

• High-speed serial communication interfaces in embedded systems
• Modem control and data terminal equipment
• Network interface controllers requiring DMA support

Specialized Procurement Notes

Verify the specific suffix designation against the manufacturer's current ordering guide to confirm pinout compatibility and environmental compliance status. Confirm that the 44-PLCC package matches the target PCB footprint requirements. Check for any recent Product Change Notices regarding packaging or material composition updates before finalizing procurement.

Specialized Selection Notes

Select this component when a microprocessor peripheral requires robust serial protocol handling with hardware-assisted flow control. Ensure the host system provides a compatible 5V logic interface and sufficient clock signal integrity for the 20 MHz operation. Verify that the application does not require life-support critical certification as per the manufacturer's policy.

Specialized Part Context

This part belongs to the Z85230 family of Enhanced Serial Communications Controllers, which are designed as successors to earlier SCC models. It offers improved performance through dedicated FIFOs and enhanced SDLC capabilities compared to legacy devices. The Z85230 series is widely recognized for its compatibility with standard Z80-family bus architectures.

Specialized Replacement Considerations

Z8523010VSG

Specialized FAQ

What is the function of the WR7' register?

Write Register 7 Prime (WR7') enables SDLC enhancements, including FIFO enable/disable controls and anti-lock features for the status FIFO.

How does the ESCC handle interrupts?

The ESCC supports vectored and nested interrupts via the INT and INTACK pins, allowing it to place an interrupt vector on the data bus during an acknowledge cycle.

What are the FIFO depths for the Z8523020VSG?

The device includes a 4-byte deep transmit FIFO and an 8-byte deep receive FIFO for each channel.