SN74ACT573NSRE4

Overview

The SN74ACT573NSRE4 is an octal D-type transparent latch with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V and features inputs that accept voltages up to 5.5V, ensuring TTL-voltage compatibility. The device provides a maximum propagation delay of 9.5ns at 5V. It is housed in a 20-pin Small Outline Package (SOP) and supports an operating temperature range from -40°C to 85°C.

Feature Summary

• Features three-state outputs designed for driving highly capacitive or low-impedance loads without requiring interface components.
• Includes buffered output-enable (OE) input to place outputs in normal logic states or high-impedance state.
• Latch-enable (LE) input controls data transparency; high level allows Q outputs to follow D inputs, while low level latches data.

Applications

• Parallel data storage
• Digital bus buffer
• Buffer registers
• I/O ports

Procurement Notes

Verify the specific ordering suffix 'E4' against current TI documentation to confirm lead finish and RoHS compliance status. Confirm package designation 'NS' corresponds to the SOP variant. Check the official product folder for the latest production status, as availability may change. Ensure the operating environment matches the specified temperature range.

Selection Notes

Select this component when designing systems requiring eight-bit parallel data storage or bus buffering with high drive capability. It is suitable for applications needing TTL-compatible inputs and fast switching speeds. Consider the SOP package constraints regarding thermal resistance and board space compared to other available packages like SOIC or TSSOP.

Part Context

This part belongs to the SNx4ACT573 family of octal D-type transparent latches with three-state outputs. The family includes variants such as SN54ACT573 for military ratings and SN74ACT573-Q1 for automotive applications. The catalog version SN74ACT573 offers standard commercial performance levels.

Replacement Considerations

SN74ACT573DWR

FAQ

How does the OE pin affect internal latch operations?

The OE pin does not affect the internal operations of the latches. Data can be retained or entered while the outputs are in the high-impedance state.

What is the function of the LE pin?

When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is taken low, the Q outputs are latched at the logic levels set up at the D inputs.