SN74AHCT573DBR

Overview

The SN74AHCT573DBR is an octal transparent D-type latch manufactured by Texas Instruments, belonging to the AHCT logic series. It features eight independent D-type latches with three-state outputs in a 20-pin SSOP package. The device operates within a supply voltage range of 2V to 5.5V and includes TTL-compatible inputs. Key electrical characteristics include a propagation delay of 18ns at 5V and low static current consumption of 8µA. It supports output drive currents of 32mA for low-level and -6mA for high-level states, functioning reliably across an industrial temperature range of -40°C to +85°C.

Feature Summary

• TTL-compatible input thresholds allow direct interfacing with standard TTL logic devices without level shifting requirements.
• Three-state outputs provide controlled bus driving capabilities with high impedance states when disabled.
• Transparent latch operation ensures Q outputs follow D inputs immediately while the latch enable signal is active.

Applications

• Registering data on microprocessor buses
• Driving memory address lines
• Parallel-to-serial conversion circuits

Procurement Notes

Verify the specific ordering suffix 'DBR' confirms the SSOP-20 package and reel packaging format. Confirm RoHS compliance status matches current manufacturing standards. Ensure the component meets the required operating temperature range specifications for your application environment before finalizing procurement decisions.

Selection Notes

Select this component when TTL-compatible logic levels are required alongside wide supply voltage flexibility. The AHCT series bridges HC speed with HCT input compatibility. Consider the SSOP package constraints regarding thermal dissipation and board space compared to larger packages like SOIC or TSSOP for dense designs.

Part Context

This part belongs to the SN74AHCT573 family of octal D-type latches. It shares functional similarities with the SN74HCT573 but offers extended voltage operation down to 2V. The DBR suffix specifically denotes the surface-mount SSOP-20 housing and tape-and-reel delivery method used for automated assembly processes.

Replacement Considerations

SN74AHCT573DWR serves as a pin-compatible alternative utilizing an SOIC-20 package instead of SSOP. SN74HCT573DBR provides similar functionality but lacks the 2V minimum supply voltage capability. Verify package dimensions and thermal characteristics when substituting between SSOP and SOIC variants.