SN74ACT573DBR

Overview

The SN74ACT573DBR 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 TTL-voltage compatible inputs. The device provides a maximum propagation delay of 9.5ns at 5V and supports output currents up to ±24mA. Designed for driving highly capacitive or low-impedance loads, it utilizes a 20-pin SSOP package.

Feature Summary

• Features three-state outputs designed for driving highly capacitive or relatively low-impedance loads.
• Inputs accept voltages up to 5.5V and are TTL-voltage compatible.
• Buffered output-enable input allows placement of outputs in high-impedance state without affecting internal latch operations.

Applications

• Parallel data storage
• Digital bus buffer
• Bus drivers

Procurement Notes

Verify the specific ordering suffix 'DBR' corresponds to the SSOP package type and tape-and-reel carrier configuration. Confirm RoHS compliance status and moisture sensitivity level ratings prior to procurement. Ensure the selected component matches the required operating temperature range of -40°C to 85°C for the intended application environment.

Selection Notes

Select this component when designing systems requiring eight-bit data latching with high drive capability. The ACT logic family offers faster switching speeds compared to standard AC series. Consider the 20-pin SSOP package dimensions for PCB layout constraints and verify that the 4.5V to 5.5V supply voltage aligns with the system power architecture.

Part Context

This part belongs to the SNx4ACT573 family of octal D-type transparent latches. The catalog version SN74ACT573 is distinct from the military-rated SN54ACT573 variant. The DBR suffix specifically denotes the SSOP package format with reel packaging, differentiating it from tube-packed variants like the PDIP or SOIC versions.

Replacement Considerations

SN74ACT573DWR (SOIC package)

FAQ

How does the output-enable (OE) pin affect latch operation?

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

What is the function of the latch-enable (LE) input?

When LE is high, the Q outputs follow the D inputs. When LE goes low, the outputs are latched at the logic levels present at the D inputs.