CD74HC299E

Shift Registers Overview

The CD74HC299E is an 8-bit universal shift register manufactured by Harris Corporation, belonging to the high-speed CMOS (HCT) logic family. It features multiplexed inputs and outputs for improved bit density and supports four operating modes: shift left, shift right, hold, and parallel load. The device includes 3-state outputs capable of driving bus lines directly and is designed to be cascadable for extended word lengths. It operates within a supply voltage range of 4.5 V to 5.5 V and functions reliably across an industrial temperature range from -55 °C to +125 °C.

Shift Registers Feature Summary

• Multiplexed I/O architecture enhances bit density
• Supports bidirectional shifting, data holding, and parallel loading
• 3-state outputs enable direct bus line interfacing
• Robust ESD protection exceeding specified JEDEC standards

Shift Registers Applications

• Bidirectional data transfer in digital systems
• Parallel-to-serial and serial-to-parallel conversion
• General-purpose shift register applications requiring bus isolation

Shift Registers Procurement Notes

Verify the manufacturer designation on the component marking, as Harris Corporation's semiconductor assets were acquired by Texas Instruments. Ensure the part number suffix matches the specific package type and lead finish requirements. Confirm RoHS compliance status through official documentation, as legacy Harris parts may differ from current TI specifications. Cross-reference with Texas Instruments CD74HC299 datasheets for updated electrical characteristics and pin configurations.

Shift Registers Selection Notes

Select this component when a bidirectional 8-bit shift register with tri-state outputs is required. The HCT series ensures compatibility with TTL logic levels while offering CMOS power efficiency. Verify that the application requires the specific multiplexed I/O pin configuration and that the operating temperature range meets environmental constraints. Consider cascadability if larger word lengths are needed.

Shift Registers Part Context

This component is part of the 74HC/HCT series of high-speed CMOS logic devices, originally developed by Harris Semiconductor before its acquisition by Texas Instruments. The 74HC299 variant specifically provides universal shift register functionality with 3-state outputs. It serves as a bridge between parallel and serial data formats in digital circuits, maintaining compatibility with low-power Schottky TTL standards.

Shift Registers Replacement Considerations

Texas Instruments CD74HC299N or CD74HC299M are direct functional equivalents. NXP 74HC299D is also compatible. Verify pinout and electrical parameters match exactly before substitution.