M74HCT573TTR

Latches Overview

The M74HCT573TTR is an obsolete octal D-type latch with 3-state outputs manufactured by STMicroelectronics. It operates within a supply voltage range of 4.5V to 5.5V and features a typical propagation delay of 21ns at VCC = 4.5V. The device supports a maximum quiescent supply current of 4μA at 25°C. It utilizes TSSOP-20 packaging and provides symmetrical output impedance with |IOH| = IOL = 6mA (min). Input levels are compatible with TTL standards, requiring a minimum high-level input voltage of 2.0V and a maximum low-level input voltage of 0.8V.

Latches Feature Summary

• Octal D-type latch architecture with transparent data capture when latch enable is active
• Three-state output configuration controlled by an active-low output enable input
• Direct interface capability between HSC2MOS systems and TTL or NMOS components
• Integrated protection circuits on all inputs against static discharge and transient excess voltage

Latches Applications

• Bus organized system design utilizing the three-state output configuration
• Data latching applications in digital logic circuits
• System interfacing between CMOS and TTL/NMOS logic families

Latches Procurement Notes

This component is officially classified as an obsolete product by the manufacturer. Verify availability through authorized distributors for surplus stock only. Confirm that the TSSOP-20 package matches your PCB footprint requirements. Ensure compliance with RoHS directives if applicable to your specific procurement batch. No new production units are expected from the original manufacturer.

Latches Selection Notes

Select this component only if legacy compatibility with the 74 series 573 pinout is required. Consider the TSSOP-20 surface mount package constraints during layout. Evaluate the 4.5V to 5.5V operating voltage range against your system power rails. Review the 21ns typical propagation delay to ensure it meets timing requirements for your specific application speed.

Latches Part Context

The M74HCT573 belongs to the HCT logic family, designed for high-speed CMOS operation with TTL-compatible inputs. It is part of a broader line of octal latches offering various package options including DIP and SOP. This specific variant represents the tape-and-reel version of the TSSOP package, intended for automated surface-mount assembly processes.

Latches Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.