74AC299PC

Overview

The onsemi 74AC299PC is an 8-bit universal shift/storage register housed in a 20-lead Plastic Dual-In-Line Package (PDIP). It features common parallel I/O pins and operates within a supply voltage range of 2.0V to 6.0V. The device supports four modes: hold, shift left, shift right, and load data. Outputs are 3-STATE with source/sink capabilities of 24mA. Propagation delays from clock to output range from 7.0ns to 25.0ns depending on the mode and voltage.

Feature Summary

• Common parallel I/O design reduces total package pin count
• Four operating modes including shift left, shift right, load, and store
• 3-STATE outputs suitable for bus-oriented applications
• Additional serial inputs and outputs facilitate expansion

Applications

• Bus-oriented data storage systems
• Serial-to-parallel and parallel-to-serial conversion circuits
• Data buffering and temporary storage in digital logic designs

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and tape/reel availability. Confirm RoHS compliance status as specifications may vary by production batch. Ensure the component meets the required operating temperature range of -40°C to +85°C for the intended application environment before finalizing procurement.

Selection Notes

Select this component when an 8-bit shift register with bidirectional shifting and common I/O is required. The AC series offers a wide voltage range compared to ACT variants. Consider the PDIP package for through-hole mounting requirements. Verify that the 24mA output drive capability meets the load requirements of the connected circuitry.

Part Context

This part belongs to the 74AC family of high-speed CMOS logic devices originally developed by Fairchild Semiconductor. The 74AC299 specifically provides universal shift and storage functionality. The 'PC' suffix denotes the 20-lead PDIP package variant. This component is part of a broader line of logic ICs used for data manipulation and transfer in digital systems.

Replacement Considerations

Check for direct substitutes such as the 74ACT299PC for TTL-compatible input requirements. Other packages like SOIC or TSSOP versions (e.g., 74AC299SC) offer alternative form factors but require footprint verification.