74ACTQ533PC

Latches Overview

The onsemi 74ACTQ533PC is an octal transparent latch with 3-STATE outputs, housed in a 20-Lead Plastic Dual-In-Line (PDIP) package. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature from -40°C to +85°C. The device features inverted outputs and provides output drive capabilities of 24 mA source and sink current. Propagation delays are specified at a maximum of 9.5 ns for LE-to-On transitions and 8.5 ns for Dn-to-On transitions under standard loading conditions.

Latches Feature Summary

• Utilizes FACT Quiet Series technology to ensure quiet output switching and improved dynamic threshold performance.
• Incorporates GTO output control and undershoot correction mechanisms alongside a split ground bus design.
• Provides guaranteed simultaneous switching noise levels and pin-to-pin skew AC performance.
• Features enhanced latch-up immunity and high ESD protection ratings.

Latches Applications

• Bus organized system applications
• Driving bus lines
• Buffering memory address registers

Latches Procurement Notes

Verify the specific ordering code suffix to confirm the package type, as the base part number covers multiple physical configurations. Confirm that the procurement channel accepts the original Fairchild Semiconductor branding or its successor entities. Ensure compliance with RoHS directives if required by the target application environment. Check for any specific handling precautions related to the PDIP packaging during assembly.

Latches Selection Notes

Select this component when an octal latch with inverted logic and 3-STATE capability is required for bus interfacing. The ACTQ series offers superior noise characteristics compared to standard AC logic families. Consider the PDIP package constraints regarding board space and thermal dissipation. Verify that the 24 mA drive strength meets the load requirements of the connected bus lines or registers.

Latches Part Context

This device belongs to the 74ACTQ family of logic integrated circuits, specifically designed for high-performance digital systems. It serves as the inverted counterpart to the 74ACT373 transparent latch. The product line emphasizes low noise and robust performance through specialized internal circuitry, making it suitable for demanding industrial and commercial environments requiring reliable data latching.

Latches Replacement Considerations

Check for direct pin-compatible alternatives from other manufacturers that support the same ACT logic family specifications. Verify that any substitute maintains the 3-STATE output functionality and the 4.5V to 5.5V operating voltage range. Ensure the replacement device offers comparable propagation delay and drive current capabilities to maintain system timing integrity.

Latches FAQ

What is the function of the Latch Enable (LE) input?

When LE is HIGH, the latches are transparent and data passes through to the outputs. When LE goes LOW, the data present at the inputs is latched and stored.

How does the Output Enable (OE) input affect the outputs?

When OE is LOW, the outputs are active in a 2-state mode. When OE is HIGH, the outputs enter a high impedance state, disconnecting them from the bus.

What distinguishes the ACTQ series from standard ACT logic?

The ACTQ series utilizes FACT Quiet Series technology, which includes GTO output control and undershoot correction to reduce simultaneous switching noise and improve dynamic threshold performance.