MC74ACT573N

Latches Overview

The MC74ACT573N is an octal latch with 3-state outputs manufactured by onsemi. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. The device features buffered common Latch Enable (LE) and Output Enable (OE) inputs, providing TTL-compatible inputs for the 'ACT series. Outputs can source or sink up to 24 mA. Propagation delays are typically 10.5 ns at 5 V for data-to-output transitions.

Latches Feature Summary

• Inputs and outputs located on opposite sides of the package to facilitate microprocessor interfacing
• Functionally identical to the MC74AC373/74ACT373 but with reversed pinout orientation
• Features 3-state outputs suitable for bus interfacing applications
• Includes buffered common Latch Enable and Output Enable control inputs

Latches Applications

• Input port interface for microprocessors
• Output port interface for microprocessors
• Bus interfacing via 3-state outputs

Latches Procurement Notes

Verify the specific suffix against the ordering information table to confirm package type and shipping quantity. Ensure the component meets RoHS compliance requirements if applicable to your manufacturing process. Confirm that the lead-free designation matches your assembly specifications. Cross-reference the marking diagram with the physical device to validate authenticity and date codes prior to integration into production systems.

Latches Selection Notes

Select this component when a high-speed octal latch with 3-state outputs is required for microprocessor interfaces. The 'ACT series provides TTL-compatible input thresholds, making it suitable for mixed-voltage logic environments. Consider the SOIC-20W package dimensions and thermal resistance values during PCB layout planning. Verify that the propagation delay characteristics meet the timing constraints of your specific system architecture.

Latches Part Context

This part belongs to the MC74AC573/74ACT573 family of octal latches. It is functionally equivalent to the MC74AC373/74ACT373 but differs in pin assignment, placing inputs and outputs on opposite sides of the package. This configuration simplifies routing in dense circuit board designs where direct connection to microprocessor buses is necessary without complex trace crossing.

Latches Replacement Considerations

MC74AC573DWG

Latches FAQ

How does the MC74ACT573N differ from the MC74AC573?

The primary difference lies in the input threshold voltages; the ACT version has TTL-compatible inputs, whereas the AC version uses CMOS-compatible thresholds.

What is the function of the OE input?

The Output Enable (OE) input controls the 3-state buffers. When OE is HIGH, the outputs enter a high-impedance state, disconnecting them from the bus.