SN74HC573ADWRG4

Overview

The SN74HC573ADWRG4 is an octal transparent D-type latch manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V and features three-state outputs. The device includes eight D-type latches with shared latch enable (LE) and output enable (OE) inputs. Propagation delay is specified at 200 ns at 2V, 40 ns at 4.5V, and 34 ns at 6V. Static current is typically 8 uA. Output drive capabilities include 32 mA low-level and -7.8 mA high-level currents. It functions reliably across an operating temperature range from -40°C to +85°C.

Feature Summary

• Octal transparent D-type latch architecture with three-state outputs for bus interfacing
• Wide operating voltage range supporting 2V to 6V power supplies
• Low static power consumption with typical supply current of 8 uA
• Robust output drive capability suitable for driving multiple loads

Applications

• Parallel-to-serial data conversion in communication systems
• Address/data bus buffering in microprocessor-based designs
• General-purpose memory register applications
• I/O port expansion for digital control circuits

Procurement Notes

Verify the complete part number including the suffix G4, which indicates RoHS compliance and green material status. Confirm the SOIC-20 package variant matches your PCB footprint requirements. Ensure the voltage rating aligns with your system's 2V to 6V operational window. Check for automotive or extended temperature variants if your application demands higher reliability or wider thermal ranges beyond standard commercial specifications.

Selection Notes

Select this component when an octal latch with tri-state outputs is required for bus management. It is suitable for designs needing wide voltage flexibility between 2V and 6V. Consider alternative series like AHC or HCS if lower propagation delay or Schmitt-trigger inputs are necessary. Verify that the 20-SOIC package dimensions fit your assembly constraints. Ensure the 32 mA sink current meets your load requirements without exceeding thermal limits.

Part Context

This device belongs to the Texas Instruments 74HC logic family, known for high-speed CMOS operation compatible with TTL standards. The HC series offers improved speed over legacy 74LS devices while maintaining low power consumption. The SN74HC573 specifically provides octal latching functionality, distinguishing it from flip-flop variants like the SN74HC574 which use clock edges rather than level-sensitive latching for data storage.

Replacement Considerations

SN74HC573ADWR is the non-RoHS equivalent. SN74HC573ADWRE4 is the lead-free version prior to G4 designation. SN74HCS573 offers Schmitt-trigger inputs but different electrical characteristics. SN74AHC573 provides faster switching speeds. Verify pin compatibility and electrical parameters before substituting.