74AC573MTCX

Overview

The onsemi 74AC573MTCX is an octal D-type transparent latch with three-state outputs in a 20-lead Thin Shrink Small Outline Package (TSSOP). It operates within a supply voltage range of 2.0V to 6.0V and supports an operating temperature from -40°C to +85°C. The device features buffered common Latch Enable (LE) and Output Enable (OE) inputs, allowing data transparency when LE is HIGH and storage upon transition to LOW. Outputs source and sink up to 24 mA, facilitating direct bus interfacing.

Feature Summary

• Buffered common Latch Enable and Output Enable inputs for simplified control
• Outputs located on opposite sides of the package to facilitate microprocessor interface routing
• Three-state output buffers enable direct connection to system buses without external drivers

Applications

• Microprocessor input or output port expansion
• Bus interfacing applications requiring high-impedance states
• Octal data latching in digital logic systems

Procurement Notes

Verify that the ordering code includes the 'X' suffix to confirm tape and reel packaging. Confirm the specific package variant matches the required footprint, as the base part number covers multiple packages including SOIC and TSSOP. Ensure the AC series designation is selected over ACT if TTL-compatible inputs are not required.

Selection Notes

Select this component for designs requiring high-speed latching with reduced quiescent current compared to older generations. The AC series offers a wider supply voltage range than the ACT variant. Verify that the 24 mA drive capability meets load requirements and that the TSSOP thermal characteristics suit the enclosure design.

Part Context

This device belongs to the 74AC family of high-speed CMOS logic. It is functionally identical to the 74AC373 but utilizes an inverted pinout layout where inputs and outputs are positioned on opposite sides of the package. This configuration is specifically optimized to reduce trace crossing complexity in microprocessor-based board layouts.

Replacement Considerations

The 74ACT573MTCX serves as a compatible alternative if TTL-compatible input thresholds are required. Other manufacturers produce equivalent octal latches, but verification of pinout compatibility and electrical specifications against the Fairchild datasheet is mandatory.