CD40105BE

Overview

The CD40105BE is an asynchronous FIFO memory device manufactured by Harris Corporation, belonging to the 4000B series. It provides a total memory capacity of 64 bits, organized as 16 words by 4 bits (16 x 4). The component operates as a uni-directional buffer and is housed in a 16-pin Plastic Dual In-line Package (PDIP). It utilizes CMOS technology for low power consumption and high noise immunity.

Feature Summary

• Asynchronous operation allows independent read and write clock domains without synchronization requirements.
• Uni-directional data flow simplifies interface design for single-path buffering applications.
• CMOS construction ensures compatibility with standard logic families while maintaining low static power dissipation.

Applications

• Data buffering between microprocessors and peripheral devices operating at different speeds
• Interface isolation in digital communication systems requiring temporary data storage
• Level shifting and timing adjustment in mixed-speed digital circuits

Procurement Notes

Verify the manufacturer status, as Harris Corporation's semiconductor assets were acquired. Confirm the specific revision or source documentation (e.g., Texas Instruments SCHS096) to ensure authenticity. Check for RoHS compliance status, as original Harris parts may not meet current environmental standards. Validate package integrity and pin configuration against the 16-PDIP specification before integration.

Selection Notes

Select this component when asynchronous, uni-directional buffering is required for small data blocks. Ensure the system voltage range matches the CMOS specifications. Consider that the 16x4 word depth may limit throughput for high-bandwidth applications. Verify availability from authorized distributors due to potential obsolete status and acquisition history affecting supply chain continuity.

Part Context

This part belongs to the 4000B series of CMOS logic devices. Harris Corporation was a major producer of such components before its semiconductor division was acquired. The CD40105BE represents a standard asynchronous FIFO solution within this legacy portfolio, designed for general-purpose digital buffering tasks in industrial and consumer electronics.

Replacement Considerations

Check for direct equivalents from Texas Instruments or other CMOS logic manufacturers offering 16x4 asynchronous FIFOs in PDIP-16 packages. Verify pin compatibility and electrical characteristics before substitution. Note that newer generations may offer synchronous interfaces or larger depths.