CD40105BFX

Overview

The CD40105BFX is an asynchronous FIFO memory integrated circuit manufactured by Harris Corporation. It features a 16 x 4 bit configuration, providing 16 words of storage with 4 bits per word. The device operates as a uni-directional buffer and supports data transfer rates up to 4 MHz. It is housed in a 16-pin ceramic dual in-line package (CDIP). This component belongs to the CMOS logic family designed for reliable digital data buffering applications.

Feature Summary

• Asynchronous operation allows independent read and write clock domains without synchronization requirements.
• Uni-directional data flow simplifies interface design for specific buffering tasks.
• CMOS construction ensures low power consumption and high noise immunity.
• Ceramic dual in-line packaging provides robust physical protection and thermal stability.

Applications

• Digital signal processing data buffering
• Microprocessor system interface isolation
• High-speed data acquisition systems

Procurement Notes

Verify the manufacturer designation as Harris Corporation, noting that original production may be discontinued. Confirm the package type is strictly 16-CDIP (ceramic) rather than plastic variants. Check for RoHS compliance status, as older Harris CMOS parts often lack modern environmental certifications. Ensure the part number suffix matches the exact specification for asynchronous 16x4 FIFO functionality.

Selection Notes

Select this component when asynchronous buffering between different clock domains is required. The 16-word depth suits moderate buffering needs where latency must be minimized. Consider the 4-bit width compatibility with parallel data buses. Verify voltage supply requirements align with the target system's CMOS logic levels before integration into the design.

Part Context

This device is part of the broader CD4000 series of CMOS logic functions. It serves as a specialized memory element within the logic family, distinct from standard gates or counters. The CDIP package indicates a hermetic seal suitable for harsh environments, typical of industrial or military-grade electronics from the era of Harris Corporation's active production.

Replacement Considerations

Direct pin-to-pin replacements may include other 16x4 asynchronous FIFOs in CDIP packages. Verify electrical characteristics such as propagation delay and supply current match the original specifications. Ensure the substitute maintains the same uni-directional operation mode and asynchronous control logic.