74ACT373MTR

Latches Overview

The STMicroelectronics 74ACT373MTR is an octal D-type latch with three-state non-inverted outputs, fabricated using sub-micron silicon gate and double-layer metal wiring C2MOS technology. It operates within a supply voltage range of 4.5V to 5.5V. The device features high-speed performance with a typical propagation delay of 6ns at VCC = 5V. It provides symmetrical output impedance with minimum drive currents of 24mA for both high and low states. The component includes protection circuits against static discharge, offering 2kV ESD immunity.

Latches Feature Summary

• Octal D-type latch configuration with three-state outputs controlled by Latch Enable (LE) and Output Enable (OE) inputs.
• High-speed CMOS fabrication enabling direct interfacing with TTL and NMOS components.
• Symmetrical output impedance ensuring balanced propagation delays between high-to-low and low-to-high transitions.

Latches Applications

• Bus-organized system applications requiring data latching and tri-state control.
• High-speed CMOS systems interfacing with TTL or NMOS logic families.
• Transmission line driving applications utilizing 50Ω capability.

Latches Procurement Notes

Verify the specific package type required, as the 'M' suffix indicates SOIC-20 packaging. Confirm that the application environment supports the specified operating temperature range of -55°C to 125°C. Ensure power supply stability remains within the 4.5V to 5.5V range to maintain electrical characteristics. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Latches Selection Notes

Select this component when an octal latch with three-state outputs is needed for bus-oriented architectures. It is suitable for designs requiring compatibility with standard 74 series pinouts while benefiting from improved speed and lower power dissipation compared to older technologies. Consider the 50Ω transmission line driving capability if long-distance signal integrity is a priority in the circuit layout.

Latches Part Context

This part belongs to the 74ACT family of high-speed CMOS logic devices. It serves as a functional equivalent to the standard 74LS373 but offers superior switching speeds and reduced power consumption. The device is designed to bridge the gap between high-speed CMOS systems and legacy TTL or NMOS components, providing reliable data storage and bus isolation in digital logic circuits.

Latches Replacement Considerations

Check for cross-manufacturer equivalents such as those from Texas Instruments or ON Semiconductor that share the 74ACT373 designation. Verify pinout compatibility and electrical specifications, particularly propagation delays and output drive strengths, before substituting. Ensure the alternative component supports the same SOIC-20 package dimensions for mechanical fit.

Latches FAQ

How does the Output Enable (OE) input affect the state of the Q outputs?

When the OE input is low, the eight outputs are in a normal logic state (high or low). When the OE input is high, the outputs enter a high-impedance state, effectively disconnecting them from the bus.

What is the function of the Latch Enable (LE) input?

When LE is high, the Q outputs follow the data inputs (D). When LE is taken low, the outputs latch and hold the logic levels present at the D inputs at that moment, regardless of subsequent changes in the data inputs.