74ACT573TTR

Latches Overview

The STMicroelectronics 74ACT573TTR is an octal D-type transparent latch with 3-state outputs, fabricated using advanced sub-micron silicon gate and double-layer metal wiring C2MOS technology. It operates within a supply voltage range of 4.5V to 5.5V. Key electrical characteristics include a typical propagation delay (tPD) of 5ns at VCC = 5V and a maximum quiescent supply current (ICC) of 4μA at 25°C. The device features symmetrical output impedance with minimum drive currents of |IOH| = IOL = 24mA. Input thresholds are compatible with TTL standards, specifying a minimum high-level input voltage (VIH) of 2V and a maximum low-level input voltage (VIL) of 0.8V.

Latches Feature Summary

• Advanced CMOS fabrication utilizing sub-micron silicon gate and double-layer metal wiring for high-speed performance.
• Balanced propagation delays ensuring symmetrical timing characteristics between logic transitions.
• Integrated protection circuits providing immunity against static discharge up to 2kV ESD.
• Direct interface capability with High Speed CMOS systems alongside TTL and NMOS components.

Latches Applications

• High-speed data latching in digital communication systems
• Bus driver applications requiring 3-state output control
• Memory address register buffering
• General-purpose parallel-to-serial conversion interfaces

Latches Procurement Notes

Verify the component status as obsolete before procurement planning. Confirm that the TSSOP-20 package variant matches the specific design requirements. Ensure compatibility with existing PCB footprints and reflow soldering profiles suitable for thin-shrink small-outline packages. Review the datasheet for any updates regarding lead-free compliance or RoHS directives applicable to this discontinued series.

Latches Selection Notes

Select this component when designing systems requiring octal latching with tri-state bus interfacing capabilities. The ACT series offers improved speed over standard 74LS equivalents while maintaining pin compatibility. Consider the 5ns propagation delay and 24mA drive strength for driving moderate capacitive loads. Verify that the operating temperature range of -55°C to 125°C meets the environmental constraints of the target application.

Latches Part Context

This part belongs to the 74ACT family of advanced CMOS logic devices manufactured by STMicroelectronics. It serves as a direct functional replacement for the industry-standard 74HC573 and 74LS573 in terms of pinout and logical operation, though with distinct electrical characteristics. The 'TTR' suffix specifically denotes the Tape and Reel packaging format in a TSSOP-20 housing, optimized for automated surface-mount assembly processes.

Latches Replacement Considerations

Public confirmed substitute part numbers: SN74ACT573NSR, SN74ACT573NSRE4, SN74ACT573NSRG4.