MC74HC299F

Shift Registers Overview

The MC74HC299F is an 8-bit parallel-in/parallel-out shift register manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 6.0 V and features three-state outputs for bus-driven applications. The device supports multiple modes including hold, shift left, shift right, and load data, controlled by function select inputs. It provides symmetrical output impedance with a minimum drive capability of 6 mA at 5 V. Designed for high-speed operation similar to equivalent LSTTL logic, it maintains low power consumption typical of CMOS technology.

Shift Registers Feature Summary

• Supports four operational modes: hold, shift left, shift right, and load data via dedicated function select inputs
• Features three-state outputs enabling direct connection to microprocessor buses without additional latches
• Provides high noise immunity and stable output through internal buffer circuits
• Includes input protection circuits against static discharge and transient excess voltages

Shift Registers Applications

• Bus-driven memory address registers
• General-purpose shift register applications in digital systems
• Parallel-to-serial or serial-to-parallel conversion interfaces
• Data storage elements in microprocessor-based systems

Shift Registers Procurement Notes

Verify the specific suffix 'F' indicates the DIP-16 package configuration when sourcing. Confirm RoHS compliance status as per the manufacturer's current product release notes. Ensure the operating environment remains within the specified voltage and temperature limits defined in the official datasheet. Cross-reference the part number with the latest onsemi documentation to confirm availability and any potential obsolescence notices.

Shift Registers Selection Notes

Select this component when an 8-bit PIPO shift register with three-state outputs is required for bus interfacing. It serves as a pin-compatible alternative to legacy LS299 devices while offering improved speed and lower power dissipation. Consider the 2.0 V to 6.0 V operating range for compatibility with various logic families. Evaluate the symmetrical output drive capabilities for driving standard TTL loads in mixed-voltage systems.

Shift Registers Part Context

This device belongs to the HC (High-speed CMOS) logic family, which offers performance comparable to Low-power Schottky TTL but with significantly reduced power consumption. The 8-bit architecture allows for efficient data handling in parallel systems. As a standard logic IC, it is widely used in general-purpose digital electronics where reliable data shifting and storage are essential functions.

Shift Registers Replacement Considerations

The M74HC299 from STMicroelectronics is a confirmed functional substitute with identical pinout and specifications. Other manufacturers producing 74HC299 equivalents may also serve as replacements provided they meet the same electrical characteristics and package requirements.