SN74ALS573CNS

Overview

The SN74ALS573CNS is an octal D-type transparent latch from the Texas Instruments ALS logic series, housed in a 20-pin SOP (NS) package. It features true logic outputs and 3-state buffer-type outputs designed for driving bus lines directly. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C. Electrical characteristics include a low-level output current of up to 24 mA and a high-level output current of -2.6 mA at 4.5 V. Propagation delays from data inputs to outputs are specified with maximum values of 14 ns.

Feature Summary

• Octal D-type transparent latch architecture with true logic outputs
• 3-state buffer-type outputs capable of driving highly capacitive or low-impedance loads
• Buffered output-enable input allows placement of outputs in normal logic or high-impedance states
• Bus-structured pinout facilitates implementation as buffer registers, I/O ports, and bidirectional bus drivers

Applications

• Implementing buffer registers in digital systems
• Serving as I/O ports for microprocessor interfaces
• Functioning as bidirectional bus drivers
• Operating as working registers in memory structures

Procurement Notes

Verify the specific ordering suffix 'NS' corresponds to the SOP package variant when sourcing. Confirm RoHS compliance status and lead finish details via the manufacturer's official packaging addendum. Ensure the procurement channel provides valid traceability documentation for this catalog part number. Cross-reference the active production status and recommended operating conditions against the latest datasheet revision SDAS048D.

Selection Notes

Select this component for applications requiring octal latching with direct bus driving capabilities. The ALS series offers a balance of speed and power consumption suitable for standard 5-V systems. Consider the 3-state output feature for multiplexed bus architectures where high-impedance isolation is necessary. Verify that the required propagation delay and drive strength meet the system timing and load requirements.

Part Context

This device belongs to the SN74ALS573C family of octal latches. It is functionally compatible with other SN74ALS573 variants differing primarily in package type, such as the SOIC (DW), PDIP (N), and SSOP (DB) packages. The SN74ALS573C is distinguished from the faster SN74AS573A by its specific switching characteristics and output drive levels within the same logical framework.

Replacement Considerations

Direct substitutes include SN74ALS573CDW, SN74ALS573CN, and SN74ALS573CDBR. These parts share identical electrical specifications and functionality but differ in physical package form factor. Ensure the replacement package fits the available board space and soldering process constraints.