74VHCT573ASJ

Latches Overview

The Fairchild Semiconductor 74VHCT573ASJ is an octal D-type transparent latch featuring three-state outputs, fabricated using advanced VHCT CMOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a wide operating temperature range from -40°C to 85°C. The device utilizes a 20-pin SSOP (SOP-J) surface-mount package with a standard 0.3-inch pin spacing. Designed for high-speed applications, it achieves propagation delays comparable to equivalent Bipolar Schottky TTL while maintaining low power dissipation typical of CMOS logic families.

Latches Feature Summary

• Provides eight-bit data storage controlled by dedicated latch enable and output enable inputs
• Features three-state outputs that enter a high-impedance state when the output enable input is active
• Ensures robust noise immunity through defined high and low noise voltage levels relative to the supply voltage
• Includes power-down protection on all inputs to prevent excessive current draw during low-power states

Latches Applications

• High-speed data buffering in digital communication systems
• Parallel-to-serial conversion circuits requiring precise timing control
• General-purpose memory latching in microprocessor-based interfaces
• Bus driver applications where signal isolation is required

Latches Procurement Notes

Verify the specific suffix ASJ against manufacturer documentation to confirm the exact SSOP package dimensions and tape-and-reel specifications. Confirm RoHS compliance status as manufacturing processes evolve. Check for obsolescence notices or lifecycle changes directly from Fairchild or its successor entities before finalizing procurement plans.

Latches Selection Notes

Select this component when interfacing between 5V logic systems and devices requiring high noise immunity. The VHCT series ensures TTL-compatible input thresholds while offering superior speed over standard HC series parts. Ensure the design accommodates the specific thermal characteristics and maximum switching currents associated with the SSOP-20 form factor.

Latches Part Context

This part belongs to the 74VHCT family, which bridges the performance gap between standard CMOS and bipolar logic. It maintains pin compatibility with the 74HC573 but offers faster switching speeds. The VHCT designation indicates High-Speed CMOS with TTL-compatible inputs, making it suitable for mixed-voltage environments common in industrial and consumer electronics.

Latches Replacement Considerations

Equivalent functional replacements include the 74VHC573 for non-TTL input requirements and the 74AHCT573 for alternative sourcing. Verify package compatibility when substituting with SOIC variants. Cross-reference datasheets for propagation delay variations and ensure output drive capabilities meet system load requirements.