74AC299SC

Shift Registers Overview

The onsemi 74AC299SC is an 8-bit universal shift/storage register housed in a 20-lead SOIC package. It features common parallel I/O pins for data input and output, reducing pin count. The device supports four operating modes: shift left, shift right, parallel load, and hold. Outputs are 3-state with source/sink capabilities of 24mA. Recommended supply voltage ranges from 2.0V to 6.0V, with operation supported between -40°C and +85°C.

Shift Registers Feature Summary

• Common parallel I/O pins reduce total package pin count by multiplexing inputs and outputs.
• Supports synchronous shift left, shift right, parallel load, and hold operations via mode select inputs.
• Includes separate serial outputs for Q0 and Q7 to facilitate easy serial cascading.
• Features 3-state outputs suitable for bus-oriented applications.

Shift Registers Applications

• Bus-oriented data storage systems
• Serial-to-parallel and parallel-to-serial conversion circuits
• Data expansion using serial cascading

Shift Registers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and availability status. Confirm RoHS compliance details as specified in the official datasheet. Ensure the component meets the required operating temperature range and voltage specifications for the target application environment before procurement.

Shift Registers Selection Notes

Select this component when a compact 8-bit shift register with shared I/O pins is required. The AC series offers a wide supply voltage range compared to standard TTL logic. Consider the ACT variant if TTL-compatible input thresholds are necessary. Verify that the 3-state output drive capability matches the bus loading requirements.

Shift Registers Part Context

This component belongs to the 74AC family of high-speed CMOS logic devices originally developed by Fairchild Semiconductor. The 74AC299 specifically addresses designs needing flexible data shifting and storage within a limited pin footprint. It serves as a functional alternative to dedicated shift registers or multiple flip-flop arrays in digital logic designs.

Shift Registers Replacement Considerations

Check for direct equivalents such as the 74ACT299SC for TTL-compatible inputs. Other variants like 74AC299SJ (SOP) or 74AC299MTC (TSSOP) offer different physical packages but identical logical functionality. Cross-reference with other manufacturers' 8-bit universal shift registers sharing the same pinout and electrical characteristics.