74AC299SCX

Shift Registers Overview

The onsemi 74AC299SCX is an 8-bit universal shift/storage register housed in a 20-lead SOIC package. It operates within a supply voltage range of 2.0V to 6.0V and supports temperatures from -40°C to +85°C. The device features 3-state outputs capable of sourcing or sinking 24mA. Key electrical parameters include a maximum input frequency of 124MHz at 3.3V and 173MHz at 5.0V. Propagation delays for shift operations range from 7.0ns to 23.0ns depending on voltage and temperature conditions.

Shift Registers Feature Summary

• Supports four operating modes: shift left, shift right, parallel load, and hold (store).
• Utilizes common parallel I/O pins to reduce total package pin count.
• Includes additional serial inputs and outputs for easy expansion.
• Features 3-state outputs suitable for bus-oriented applications.

Shift Registers Applications

• Bus-oriented data storage systems
• Serial-to-parallel conversion circuits
• Parallel-to-serial conversion circuits
• Universal shift registers for digital logic expansion

Shift Registers Procurement Notes

Verify the specific suffix 'SCX' corresponds to the SOIC-20 tape and reel packaging configuration as defined in the ordering information. Confirm that the AC logic family specifications align with the required voltage and speed parameters for the target application environment. Ensure compatibility with existing board layouts regarding the 20-lead small outline integrated circuit dimensions.

Shift Registers Selection Notes

Select this component when an 8-bit universal shift register with shared I/O functionality is required. The AC series offers lower power consumption compared to older standards while maintaining high-speed performance. Consider the ACT variant if TTL-compatible input thresholds are necessary for interfacing with legacy logic families. Verify that the 3-state output buffering meets the drive requirements of the connected bus lines.

Shift Registers Part Context

This component belongs to the 74AC logic family, representing high-speed CMOS technology. It serves as a functional equivalent to earlier shift register designs but with improved power efficiency and switching speeds. The device integrates eight D-type flip-flops with interstage logic to manage synchronous shifting and loading operations efficiently within a compact surface-mount footprint.

Shift Registers Replacement Considerations

The 74ACT299SCX is a compatible alternative within the same datasheet offering TTL-compatible inputs. Other variants such as 74AC299SJ or 74AC299MTC provide different package options like SOP or TSSOP. Direct cross-manufacturer replacements should be verified against pinout and electrical specification tables to ensure functional parity.