Z85C3008PSG

Specialized Overview

The Z85C3008PSG is a CMOS Serial Communications Controller (SCC) designed for nonmultiplexed bus microprocessors. It features two independent full-duplex channels supporting data rates up to 4.1 Mbps. The device integrates separate crystal oscillators, Baud Rate Generators (BRG), and Digital Phase-Locked Loops (DPLL) for clock recovery in each channel. It supports asynchronous modes with 5 to 8 data bits and programmable stop bits, as well as synchronous byte-oriented and bit-oriented protocols including SDLC/HDLC. The component operates within a supply voltage range of 4.5 V to 5.5 V and is housed in a 40-pin Dual In-line Package (PDIP).

Specialized Feature Summary

• Dual-channel architecture with independent clocking and baud rate generation for each channel.
• Multiprotocol support including asynchronous, synchronous, and SDLC/HDLC modes with CRC generation and checking.
• Integrated status FIFO and byte counter to facilitate high-speed DMA transfers.
• Software interrupt acknowledge and daisy-chain interrupt hierarchy capabilities.

Specialized Applications

• Serial communication interfaces for nonmultiplexed microprocessor systems.
• Implementation of SDLC and HDLC protocol stacks.
• T1 digital trunk support applications.
• General-purpose serial data transfer for peripheral devices such as diskette or tape drives.

Specialized Procurement Notes

Verify the specific suffix 'PSG' against current manufacturer documentation to confirm package type and lead-free status. Confirm end-of-life status with authorized distributors prior to design-in, as availability may be restricted. Ensure compatibility with nonmultiplexed bus architectures when integrating this component into system designs.

Specialized Selection Notes

Select the Z85C3008PSG for applications requiring interface with nonmultiplexed address/data buses. Compare against the Z80C30 series if multiplexed bus optimization is required. Verify that the 40-pin DIP package meets the mechanical constraints of the target PCB layout. Ensure the system clock frequency aligns with the supported operational speeds defined in the electrical characteristics.

Specialized Part Context

This component belongs to the Zilog Z85C30 family of CMOS Serial Communications Controllers. It is pin-compatible with earlier NMOS versions, facilitating direct upgrades. The Z85C30 variant is specifically optimized for nonmultiplexed bus microprocessors, distinguishing it from the Z80C30 which targets multiplexed bus systems. Both share core functional capabilities but differ in bus interface timing and pin assignments.

Specialized Replacement Considerations

The Z80C3008PSG is listed as End-of-Life (EOL) in revision history. Direct pin-compatible replacements within the same family include other Z85C30 variants with different speed ratings or packages, provided the bus interface requirements match. Verify software register compatibility when substituting with other SCC family members.