74ACT299MTC

Shift Registers Overview

The onsemi 74ACT299MTC is an 8-bit universal shift/storage register housed in a 20-lead TSSOP package. It features TTL-compatible inputs and 3-state outputs capable of sourcing or sinking 24 mA. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports temperatures from -40°C to +85°C. Key electrical parameters include a maximum propagation delay of 14 ns at 5.5 V, a quiescent supply current of 40 µA, and input leakage of ±1 µA.

Shift Registers Feature Summary

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

Shift Registers Applications

• Bus-oriented data storage systems
• Serial-to-parallel data conversion circuits
• Parallel-to-serial data transmission modules
• Universal shift registers in digital logic designs

Shift Registers Procurement Notes

Verify the specific ordering code against the manufacturer's documentation to ensure correct package type and suffix requirements. Confirm that the application environment remains within the specified 4.5 V to 5.5 V supply voltage limits. Ensure thermal management aligns with the -40°C to +85°C operating temperature range. Check for any specific lifecycle status updates regarding availability.

Shift Registers Selection Notes

Select this component when an 8-bit universal shift register with common parallel I/O is required. The ACT series provides TTL-compatible inputs, facilitating integration with legacy logic families. The 3-state output capability allows direct connection to system buses without external buffering. Consider the TSSOP package dimensions for PCB layout constraints.

Shift Registers Part Context

This component belongs to the AC/ACT logic family, designed for high-speed digital applications. The 74ACT299 specifically addresses the need for versatile data handling in compact packages. Its design reduces pin count through multiplexed I/O, making it suitable for space-constrained electronic devices requiring reliable shift and storage functionality.

Shift Registers Replacement Considerations

Direct substitutes include the 74AC299MTC (AC series) and variants from other manufacturers such as STMicroelectronics' 74ACT299M. Verify pin compatibility and electrical specifications before substitution.

Shift Registers FAQ

How does the 74ACT299MTC handle parallel data loading?

Parallel data is loaded by setting mode select inputs S0 and S1 to HIGH while applying data to the I/O pins. The rising edge of the clock pulse transfers this data into the flip-flops.

What is the function of the Master Reset (MR) pin?

The MR pin is an active LOW asynchronous reset. When driven LOW, it overrides all other inputs and resets all flip-flop outputs to a LOW state immediately.